Chapter 9 Human and Anatomy 1
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Questions and Answers

What primarily distinguishes isotonic contraction from isometric contraction?

  • Isometric contraction allows for bone movement.
  • Both result in increased muscle tension.
  • Isotonic contraction involves changes in muscle length. (correct)
  • Isotonic contraction occurs without muscle tension.

    • Which statement about skeletal muscle fibers is true?

  • Skeletal muscle fibers are non-striated and involuntary.
  • Skeletal muscle fibers do not require neuronal stimulation.
  • Skeletal muscle fibers are multinucleated with a singular neuron connection.
  • Each skeletal muscle fiber is cylindrical and striated. (correct)

    • How do cardiac muscle fibers communicate to ensure coordinated contractions?

  • Through the motor unit mechanism.
  • By forming gap junctions with skeletal muscle.
  • Via intercalated disks allowing for spontaneous excitation. (correct)
  • Through direct connections to neurons for each fiber.

    • What is the role of a prime mover in skeletal muscle action?

    <p>It is mainly responsible for most of the movement.</p> Signup and view all the answers

    Which type of muscle tissue is characterized by tapered fibers and involuntary control?

    <p>Smooth (visceral) muscle tissue</p> Signup and view all the answers

    What defines the term 'muscle tone'?

    <p>A state of partial contraction in skeletal muscle.</p> Signup and view all the answers

    What is the primary function of synergists in skeletal muscle actions?

    <p>To assist the prime mover in facilitating movement.</p> Signup and view all the answers

    What unique feature aids in the rhythmic contraction of smooth muscle tissue?

    <p>Gap junctions facilitating intercommunication.</p> Signup and view all the answers

    What is the primary role of ATP in muscle contraction?

    <p>To facilitate cross bridge formation between actin and myosin filaments</p> Signup and view all the answers

    Which statement best describes myoglobin's function in muscle tissues?

    <p>It traps oxygen that is not immediately used by muscle fibers.</p> Signup and view all the answers

    What is the consequence of prolonged strenuous exercise on muscle respiration?

    <p>Increased production of lactic acid due to anaerobic respiration</p> Signup and view all the answers

    How does oxygen debt affect the metabolic processes in muscle tissue?

    <p>It determines the amount of oxygen needed to metabolize lactic acid back to glucose.</p> Signup and view all the answers

    During muscle contraction, which energy source is primarily utilized?

    <p>ATP is mostly generated from cellular respiration, while heat is a byproduct.</p> Signup and view all the answers

    What distinguishes red muscle fibers from white muscle fibers?

    <p>Red muscle fibers can regenerate ATP quickly.</p> Signup and view all the answers

    What does the all-or-none response of muscle fibers imply?

    <p>A muscle fiber will either contract fully or not at all.</p> Signup and view all the answers

    Which phase follows the latent period in a muscle twitch?

    <p>Contraction phase</p> Signup and view all the answers

    Which of the following correctly describes summation in muscular responses?

    <p>It occurs when a muscle cannot relax fully between contractions.</p> Signup and view all the answers

    What characterizes the refractory period following muscle contraction?

    <p>The muscle is unable to respond to normal stimuli.</p> Signup and view all the answers

    Which statement is true regarding the motor unit function?

    <p>Motor units are composed of multiple types of muscle fibers.</p> Signup and view all the answers

    In excitation-contraction coupling, what is the role of calcium ions?

    <p>They initiate and regulate muscle contractions.</p> Signup and view all the answers

    Which concept explains the sliding filament model of muscle contraction?

    <p>Actin and myosin filaments slide past each other without changing length.</p> Signup and view all the answers

    How do red muscle fibers maintain contraction for longer durations?

    <p>They have a richer blood supply and more mitochondria.</p> Signup and view all the answers

    Which type of muscle fiber is typically associated with postural muscles?

    <p>Red muscle fibers</p> Signup and view all the answers

    What is the primary component found in the A band of a myofibril?

    <p>Myosin and overlapping actin</p> Signup and view all the answers

    Which structure is not involved in the excitation-contraction coupling process?

    <p>Endomysium</p> Signup and view all the answers

    What is the functional unit of muscle contraction identified between the Z lines in a myofibril?

    <p>Sarcomere</p> Signup and view all the answers

    During muscle contraction, the sliding filament model explains that which of the following occurs?

    <p>Myosin filaments slide past actin filaments</p> Signup and view all the answers

    What role do motor units play within the muscular system?

    <p>They are comprised of a motor neuron and the muscle fibers it innervates.</p> Signup and view all the answers

    Which structural component directly surrounds individual muscle fibers?

    <p>Endomysium</p> Signup and view all the answers

    What are myofilaments primarily composed of?

    <p>Myosin and actin proteins</p> Signup and view all the answers

    Which type of muscle tissue is responsible for involuntary contractions?

    <p>Both B and C</p> Signup and view all the answers

    What is the primary role of T-tubules in muscle fibers?

    <p>To conduct electrical signals deep into the muscle fiber</p> Signup and view all the answers

    Which component prevents myosin from binding to actin when the muscle is in a relaxed state?

    <p>Tropomyosin</p> Signup and view all the answers

    What is the role of acetylcholine in muscle contraction?

    <p>It generates a muscle impulse by binding to receptors on the motor end plate.</p> Signup and view all the answers

    During excitation-contraction coupling, what happens when calcium ions bind to troponin?

    <p>It allows tropomyosin to expose binding sites on actin.</p> Signup and view all the answers

    Which statement best describes a motor unit?

    <p>It includes one neuron and multiple muscle fibers it innervates.</p> Signup and view all the answers

    What is the primary function of acetylcholinesterase at the neuromuscular junction?

    <p>To break down acetylcholine to stop the muscle stimulation.</p> Signup and view all the answers

    In the sliding filament model of muscle contraction, what occurs to the H zones and I bands during contraction?

    <p>They narrow as sarcomeres shorten.</p> Signup and view all the answers

    What is located in the synaptic knob of a motor neuron?

    <p>Chemical neurotransmitters in vesicles.</p> Signup and view all the answers

    What triggers the muscle impulse that leads to contraction?

    <p>Release of acetylcholine at the neuromuscular junction.</p> Signup and view all the answers

    What structural change occurs in the sarcomere during muscle contraction according to the sliding filament model?

    <p>The thick and thin filaments slide past one another, shortening the sarcomere.</p> Signup and view all the answers

    What happens to calcium ions following muscle contraction?

    <p>They are reabsorbed into the sarcoplasmic reticulum through active transport.</p> Signup and view all the answers

    What effect does the binding of calcium to troponin have on tropomyosin?

    <p>It alters the position of tropomyosin to expose binding sites on actin.</p> Signup and view all the answers

    What is the primary role of the perimysium in muscle structure?

    <p>Holds muscle fascicles together.</p> Signup and view all the answers

    Which area of a sarcomere contains only myosin filaments?

    <p>H zone.</p> Signup and view all the answers

    What structural change in the muscle fiber occurs when it contracts?

    <p>The I band narrows.</p> Signup and view all the answers

    Which of the following accurately describes the structure of myosin?

    <p>It has a head region that forms cross bridges.</p> Signup and view all the answers

    Which connective tissue structure attaches muscle to bone?

    <p>Tendon.</p> Signup and view all the answers

    What is the primary function of acetylcholinesterase at the neuromuscular junction?

    <p>To break down acetylcholine and terminate its action</p> Signup and view all the answers

    Which event occurs first in the process of muscle contraction at the neuromuscular junction?

    <p>The neuron's synaptic vesicles release acetylcholine</p> Signup and view all the answers

    What is the main role of calcium ions in the excitation-contraction coupling process?

    <p>They bind to troponin, leading to a change in tropomyosin position</p> Signup and view all the answers

    Which structure is primarily responsible for generating a muscle impulse when acetylcholine binds to its receptors?

    <p>Motor end plate</p> Signup and view all the answers

    What happens to the H zones and I bands in sarcomeres during muscle contraction?

    <p>They narrow as the thick and thin filaments slide past each other</p> Signup and view all the answers

    What physiological role does myoglobin serve in muscle tissues?

    <p>It stores oxygen and releases it during low oxygen levels.</p> Signup and view all the answers

    What primarily happens to lactic acid following strenuous exercise?

    <p>It is converted to glucose in the liver through a series of metabolic processes.</p> Signup and view all the answers

    How does creatine phosphate contribute to muscle contraction?

    <p>It replenishes ATP from ADP and P during muscular effort.</p> Signup and view all the answers

    What occurs during oxygen debt in muscle cells?

    <p>Anaerobic respiration becomes the dominant pathway for ATP production.</p> Signup and view all the answers

    What is the primary reason for soreness after prolonged exercise?

    <p>Accumulation of lactic acid leading to lowered pH in muscles.</p> Signup and view all the answers

    Which of the following components is primarily responsible for transporting oxygen within muscle cells?

    <p>Myoglobin</p> Signup and view all the answers

    What energy source is primarily utilized by muscles in the initial stages of contraction?

    <p>Creatine phosphate reserves.</p> Signup and view all the answers

    What does the term 'oxygen debt' specifically refer to?

    <p>The amount of oxygen required to restore normal metabolic conditions in muscle tissue.</p> Signup and view all the answers

    What happens to ATP levels during strenuous exercise?

    <p>They deplete rapidly, requiring creatine phosphate replenishment.</p> Signup and view all the answers

    What is the role of hemoglobin in relation to muscle oxygen supply?

    <p>It binds to myoglobin to enhance oxygen transport.</p> Signup and view all the answers

    Study Notes

    Muscle Contraction

    • Tetanus is a sustained contraction of skeletal muscle.
    • Muscle tone is a state of partial contraction in which some muscle fibers are contracted, while others are not.

    Types of Muscle Contraction

    • Isotonic contractions involve a change in muscle length, but no change in tension.
    • Isometric contractions involve an increase in tension, but no change in muscle length.

    Skeletal Muscle Actions

    • The origin of a muscle is the end that does not move during contraction.
    • The insertion of a muscle is the end that moves during contraction.

    Interaction of Skeletal Muscles

    • A prime mover is the muscle whose contraction is responsible for most of the movement.
    • Synergists are muscles whose contractions aid the action of the prime mover.
    • An antagonist is a muscle that opposes the action of the prime mover.

    Comparison of Skeletal, Cardiac, and Smooth Muscle Tissues

    • Skeletal muscle tissue is voluntary, striated, and multinucleated.
    • Cardiac muscle tissue is involuntary, striated, and has intercalated discs.
    • Smooth muscle tissue is involuntary, nonstriated, and is found in the walls of organs.

    Skeletal Muscle Tissue

    • Skeletal muscle fibers are cylindrical, multinucleated, striated, and voluntary.
    • Each muscle fiber is connected to a neuron.

    Cardiac Muscle

    • Cardiac muscle fibers are cylindrical and branched.
    • Each fiber is not connected to a neuron.
    • Cardiac muscle is striated and involuntary.
    • Intercalated disks allow for communication and coordinated contraction between fibers.
    • Cardiac muscle exhibits rhythmicity (self-excitation), meaning it can initiate its own contractions.

    Smooth Muscle Tissue

    • Smooth muscle fibers are tapered without striations.
    • Each fiber is not connected to a neuron.
    • Smooth muscle is involuntary.
    • Gap junctions facilitate communication and coordinated contraction between fibers.
    • Smooth muscle exhibits rhythmicity (self-excitation).
    • Smooth muscle contractions produce peristalsis, a wavelike movement that propels substances through tubular organs.

    Types of Muscle Cells

    • Red muscle fibers (slow-twitch fibers) have a good blood supply, abundant myoglobin, and many mitochondria. They contract slowly and are resistant to fatigue.
    • White muscle fibers (fast-twitch fibers) have less blood supply, myoglobin, and mitochondria. They contract quickly but fatigue easily.

    Muscular Responses

    • A threshold stimulus is the minimum amount of stimulus needed to elicit a contraction in a muscle fiber.
    • The all-or-none response states that a muscle fiber will contract fully or not at all in response to a stimulus.
    • Subthreshold stimuli result in no contraction. Threshold and suprathreshold stimuli cause full contraction.

    Muscle Twitch

    • A muscle twitch is a single full contraction of a skeletal muscle fiber.
    • A myogram is a recording of muscle responses.
    • Periods during a muscle twitch include: latent period (time between stimulus and contraction), period of contraction, period of relaxation, and refractory period (when muscle won’t respond to a stimulus).

    Sustained Contractions

    • Summation occurs when muscle contractions happen so close together that there is not time to relax between them.
    • Troponin is a protein attached to tropomyosin. Calcium ions bind to troponin, changing its shape and altering the position of tropomyosin to expose binding sites on actin.

    Neuromuscular Junction

    • The neuromuscular junction is the site where a motor nerve fiber connects to a muscle fiber.
    • A synaptic knob is the end of a motor neuron and contains vesicles of neurotransmitters, like acetylcholine.
    • A motor end plate is a folded area of the sarcolemma where the synaptic knob fits. It has receptors for neurotransmitters.
    • The synaptic cleft is the space between the synaptic knob and motor end plate, where neurotransmitters are released and bind to receptors.

    Motor Units

    • A motor unit consists of one motor neuron and all the muscle fibers it innervates.
    • Smaller motor units allow for finer and more precise movements.

    Stimulus/Steps for Contraction

    • Acetylcholine is released from synaptic vesicles at the neuromuscular junction.
    • Acetylcholine binds to receptors at the motor end plate.
    • This binding initiates a muscle impulse that travels through the sarcolemma.
    • The muscle impulse eventually reaches the sarcoplasmic reticulum and the cisternae.

    Excitation Contraction Coupling

    • Muscle impulses cause the sarcoplasmic reticulum to release calcium ions into the sarcoplasm.
    • Calcium ions bind to troponin, changing its shape.
    • The position of tropomyosin is altered, exposing binding sites on actin.
    • Myosin heads bind to actin sites, initiating the sliding filament mechanism of muscle contraction.

    Sliding Filament Model of Muscle Contraction

    • During contraction, thin filaments (actin) slide past thick filaments (myosin).
    • The H zone and I band narrow, and the Z lines more closer together.

    Steps for Muscle Relaxation

    • Acetylcholinesterase breaks down acetylcholine, ending stimulation of the muscle fiber membrane.
    • Calcium ions are actively transported back into the sarcoplasmic reticulum.
    • Tropomyosin covers the active sites on actin, and cross bridges detach.

    3 Types of Muscles

    • Skeletal muscles are voluntary.
    • Smooth muscles (visceral muscles) are involuntary.
    • Cardiac muscles are involuntary.

    Skeletal Muscle Structure

    • Fascia is a layer of fibrous connective tissue that surrounds muscles and helps hold them in place.
    • Tendons are cords of fascia that attach muscles to bones.
    • Aponeuroses are broad sheets of fascia that can attach to bones or muscles.
    • Epimysium is a connective tissue layer surrounding a whole muscle.
    • Perimysium is a connective tissue layer that surrounds bundles of muscle fibers (fascicles).
    • Endomysium is a connective tissue layer that surrounds each individual muscle fiber.

    Structure of a Muscle Fiber

    • Sarcolemma is the cell membrane of a muscle fiber.
    • Sarcoplasm is the cytoplasm of a muscle fiber.
    • Myofibrils are tightly packed bundles of muscle protein filaments, occupying most of the sarcoplasm.
    • Myofilaments are the protein filaments within myofibrils.
      • Actin is a thin filament.
      • Myosin is a thick filament.
    • Sarcoplasmic reticulum is the endoplasmic reticulum of a muscle fiber.
    • Transverse tubules (T-tubules) are invaginations of the sarcolemma that extend through the muscle fiber, containing extracellular fluid.
    • Cisternae are enlarged sacs of the sarcoplasmic reticulum located on either side of T-tubules.

    Arrangement of Myofilaments

    • The A band represents the length of the myosin filament, including some overlapping actin.
    • The I band is made up of actin only and sits between A bands.
    • The H zone is the center of the A band containing only myosin.
    • The Z line runs down the center of the I band.
    • A sarcomere is the area between two Z lines, representing the smallest unit of muscle contraction.

    Structure of Myofilaments

    • Myosin filaments are composed of the protein myosin and have cross bridges.
    • Actin filaments are made up of three proteins: actin, tropomyosin, and troponin.

    Energy Sources for Contraction

    • ATP is necessary for cross bridge formation between actin and myosin.
    • Creatine phosphate can break down to release energy that reforms ATP from ADP and P.
    • Glycogen can be broken down into glucose for cellular respiration.

    Oxygen Supply

    • Hemoglobin in red blood cells stores oxygen, which moves from blood capillaries into muscle fibers.
    • Myoglobin in muscle cells binds to oxygen with a higher affinity than hemoglobin and stores it for later use.
    • This allows muscles to function even during periods of reduced blood supply.

    Oxygen Debt

    • During strenuous exercise, oxygen may be used up faster than it can be replenished.
    • Anaerobic respiration is used to produce energy, leading to the formation of lactic acid which accumulates in the muscle.
    • Lactic acid lowers the pH, contributes to muscle soreness, and requires oxygen to be converted back to glucose by the liver.
    • Oxygen debt refers to the amount of oxygen needed to convert lactic acid back to glucose and replenish ATP and creatine phosphate levels.

    Muscle Contraction and Energy

    • Muscles require energy for contraction, primarily from cellular respiration.
    • Much of this energy is lost as heat.

    Types of Muscle Tissue

    • Skeletal (voluntary): Muscles that move the skeleton.
    • Smooth (visceral, involuntary): Found in the walls of organs.
    • Cardiac (involuntary): Muscle tissue found in the heart.

    Skeletal Muscle Structure

    • Connective tissue coverings:
      • Fascia: Layers of fibrous connective tissue surrounding muscles, holding them in place.
      • Tendon: A strong cord of fibrous tissue that connects muscle to bone.
      • Aponeuroses: Broad, flat sheets of connective tissue that may attach to bone or muscles.
    • Epimysium: A layer of connective tissue surrounding the entire muscle.
    • Perimysium: Connective tissue extending inward from the epimysium, surrounding bundles of muscle fibers called fascicles.
    • Endomysium: Connective tissue extending inward from the perimysium, surrounding individual muscle fibers.

    Muscle Fiber (Cell) Structure

    • Sarcolemma: The cell membrane of a muscle fiber.
    • Sarcoplasm: The cytoplasm of a muscle fiber.
    • Myofibrils: Tightly packed bundles of protein filaments, primarily responsible for muscle contraction, found in the sarcoplasm.
      • Myofilaments: Protein filaments within myofibrils.
        • Actin: Thin filaments.
        • Myosin: Thick filaments.
    • Sarcoplasmic reticulum: The endoplasmic reticulum of a muscle fiber, storing calcium ions.
    • Transverse tubules (T-tubules): Indentions of the sarcolemma that pass through the muscle fiber, filled with extracellular fluid.
    • Cisterna: Enlarged sacs of the sarcoplasmic reticulum located on either side of T-tubules.

    Myofilament Arrangement

    • A band: The length of the myosin filament, includes some actin where they overlap.
    • I band: The region between A bands, containing only actin filaments.
    • H zone: The central region of the A band, containing only myosin filaments.
    • Z line: Runs down the center of the I band, anchoring the actin filaments.
    • Sarcomere: The smallest functional unit of a muscle fiber, extending from one Z line to the next.

    Myofilament Structure

    • Myosin: Composed of the protein myosin, containing cross-bridges that bind to actin.
    • Actin: Composed of three proteins:
      • Actin: The primary protein forming the thin filaments.
      • Tropomyosin: Covers the active sites on actin, preventing myosin binding.
      • Troponin: Attached to tropomyosin, binding to calcium ions.

    Neuromuscular Junction

    • Synaptic knob: The end of a motor neuron, containing vesicles filled with neurotransmitters.
    • Motor end plate: A specialized region of the sarcolemma where the synaptic knob connects.
    • Synaptic cleft: The space between the synaptic knob and motor end plate, containing neurotransmitters.

    Motor Units

    • A motor unit consists of a single motor neuron and all the muscle fibers it innervates.
    • Smaller motor units allow for finer, more precise movements.

    Steps for Muscle Contraction

    • Acetylcholine (ACh) release: Nerve impulses trigger the release of acetylcholine from synaptic vesicles.
    • ACh binding: Acetylcholine binds to receptors on the motor end plate.
    • Muscle impulse generation: Binding of ACh generates a muscle impulse that travels through the sarcolemma and T-tubules.
    • Calcium release: The muscle impulse triggers the release of calcium ions from the sarcoplasmic reticulum.
    • Calcium binding: Calcium binds to troponin, causing it to change shape.
    • Tropomyosin movement: The change in troponin shape shifts tropomyosin, exposing the active sites on actin.
    • Cross-bridge formation: Myosin cross-bridges bind to the exposed active sites on actin.
    • Sliding filaments: Myosin cross-bridges pull the actin filaments towards the center of the sarcomere, shortening the sarcomere.

    Steps for Muscle Relaxation

    • Acetylcholine breakdown: The enzyme acetylcholinesterase breaks down acetylcholine at the neuromuscular junction, stopping the muscle impulse.
    • Calcium reuptake: Calcium ions are actively transported back into the sarcoplasmic reticulum.
    • Tropomyosin covers active sites: Tropomyosin returns to covering the active sites on actin, preventing myosin binding.
    • Cross-bridges detach: Myosin cross-bridges detach from actin, and the muscle fiber relaxes.

    Energy Sources for Muscle Contraction

    • ATP: Directly powers the cross-bridge formation and sliding of the filaments.
    • Creatine phosphate: Used to quickly regenerate ATP from ADP and phosphate.
    • Glycogen: Stored in muscle cells, can be broken down into glucose for cellular respiration.

    Oxygen Supply

    • Hemoglobin: In red blood cells, stores oxygen for transport to the muscles.
    • Myoglobin: In muscle cells, stores oxygen for use when blood flow is reduced.

    Oxygen Debt

    • Oxygen debt: Occurs during strenuous exercise when oxygen supply is limited, leading to anaerobic respiration.
    • Lactic acid production: Anaerobic respiration produces lactic acid, resulting in muscle soreness.
    • Repaying oxygen debt: Requires oxygen to convert lactic acid back to glucose and restore normal ATP and creatine phosphate levels.

    Types of Muscle Fibers

    • Red (slow twitch) fibers: Have abundant blood supply, myoglobin, and mitochondria, allowing them to generate ATP quickly and sustain contractions for longer periods.
    • White (fast twitch) fibers: Contract quickly, but fatigue rapidly due to lower blood supply, myoglobin, and mitochondria.

    Muscular Responses

    • Threshold stimulus: The minimum amount of stimulus needed to elicit a contraction.
    • All-or-none response: A muscle fiber either contracts completely or not at all.
    • Muscle twitch: A single, brief contraction of a muscle fiber in response to a stimulus.
    • Summation: When stimuli occur close together, the muscle does not fully relax before the next contraction, increasing tension.
    • Tetanus: When stimuli are so close together that there is no relaxation between contractions, producing a sustained contraction.
    • Muscle tone: A state of partial contraction in a skeletal muscle, allowing for smooth movements and maintaining posture.

    Types of Muscle Contraction

    • Isotonic: Contraction where the muscle changes length, moving a bone.
    • Isometric: Contraction where the muscle does not change length, but increases tension.

    Skeletal Muscle Actions

    • Origin: The end of a muscle that remains stationary during contraction.
    • Insertion: The end of a muscle that moves during contraction.

    Interaction of Skeletal Muscles

    • Prime mover: The muscle primarily responsible for a specific movement.
    • Synergists: Muscles that assist the prime mover in its action.
    • Antagonist: A muscle that opposes the action of the prime mover.

    Comparison of Muscle Types

    • Skeletal: Cylindrical, multinucleated, striated, voluntary.
    • Cardiac: Cylindrical, branched, single nucleus per fiber, striated, involuntary, interconnected with gap junctions, rhythmicity.
    • Smooth: Tapered, single nucleus per fiber, non-striated, involuntary, interconnected with gap junctions, rhythmicity, peristalsis.

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    Description

    Explore the mechanisms of muscle contraction including tetanus, isotonic, and isometric contractions. Understand the roles of prime movers, synergists, and antagonists in muscle interaction. Additionally, differentiate between skeletal, cardiac, and smooth muscle tissues.

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