Muscle Contraction and Structure Quiz
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Questions and Answers

What plays a critical role in muscle contraction by connecting to actin?

  • Acetylcholine
  • Calcium ions
  • Myosin (correct)
  • Tropomyosin

    • The strength of a muscle contraction relies solely on the size of the muscle fibers involved.

    False

    What neurotransmitter is responsible for stimulating muscle contraction?

    Acetylcholine

    The process of myofilaments sliding past each other during muscle contraction is explained by the _______.

    <p>Sliding Filament Theory</p> Signup and view all the answers

    Match the structures with their functions in muscle contraction:

    <p>Myosin = Attaches to actin and pulls Actin = Forms the thin filament Calcium ions = Stimulates muscle contraction by binding to troponin Acetylcholine = Neurotransmitter that initiates muscle contraction</p> Signup and view all the answers

    Which type of muscle forms the structure of the heart?

    <p>Cardiac Muscle</p> Signup and view all the answers

    Skeletal muscle is primarily responsible for involuntary movements.

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

    What is the function of epimysium in skeletal muscle?

    <p>Covers the whole muscle.</p> Signup and view all the answers

    The thin layer of connective tissue surrounding each muscle fiber is called the ______.

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

    Match the following muscle types with their characteristics:

    <p>Skeletal Muscle = Attaches to bones for movement Smooth Muscle = Forms hollow organs Cardiac Muscle = Involuntary muscle that makes up the heart Fascia = Connective tissue separating muscle layers</p> Signup and view all the answers

    What is the main role of myofibrils in skeletal muscle?

    <p>Facilitating muscle contractions</p> Signup and view all the answers

    What differentiates myosin and actin in muscle tissue?

    <p>Myosin is a thick myofilament, while actin is a thin myofilament.</p> Signup and view all the answers

    The sarcoplasmic reticulum is responsible for the storage of sodium ions.

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

    What is the role of calcium ions in muscle contraction?

    <p>They initiate the contraction process.</p> Signup and view all the answers

    The H-zone contains both actin and myosin filaments.

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

    What connects a nerve fiber to a muscle fiber?

    <p>Neuromuscular Junction</p> Signup and view all the answers

    The __________ is the light band composed of thin actin filaments.

    <p>T-band</p> Signup and view all the answers

    Match the components with their functions:

    <p>Sarcoplasmic Reticulum = Stores calcium ions T-tubules = Transmits signals from the sarcolemma M-line = Anchors myosin filaments Synaptic Cleft = Releases neurotransmitters</p> Signup and view all the answers

    Which of the following describes the A-band?

    <p>It contains thick myosin filaments overlapping with thin actin filaments.</p> Signup and view all the answers

    Every muscle fiber has multiple motor end plates.

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

    The __________ provides a gap between the motor end plate and neuron.

    <p>Synaptic cleft</p> Signup and view all the answers

    What is the role of acetylcholine (ACh) in muscle contraction?

    <p>It is released when a nerve impulse reaches the presynaptic terminal.</p> Signup and view all the answers

    Muscle relaxation occurs when calcium ions are actively transported back to the sarcoplasmic reticulum.

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

    What phenomenon describes a muscle fiber contracting completely when a threshold stimulus is applied?

    <p>All-or-None Response</p> Signup and view all the answers

    The enzyme that decomposes acetylcholine is called __________.

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

    Match the following components involved in muscle contraction with their functions:

    <p>Acetylcholine = Chemical that signals muscle contraction Calcium Ions = Facilitates sliding filament movement ATP = Primary energy source for muscle contractions Creatine Phosphate = Transfers energy in active muscles</p> Signup and view all the answers

    What happens to muscle fibers when the nerve impulse stops?

    <p>Cross-bridges between actin and myosin are broken.</p> Signup and view all the answers

    Less than half of the energy produced during muscle activity is utilized for muscle contraction.

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

    Threshold stimuli are the minimum strength of stimuli required to cause muscle __________.

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

    What is one consequence of muscle fatigue?

    <p>Muscle fibers contract slowly and are more susceptible to fatigue.</p> Signup and view all the answers

    Fast muscle fibers are best suited for lengthy exercises.

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

    What does lactic acid accumulation result in?

    <p>Cramps and muscle soreness.</p> Signup and view all the answers

    A sustained contraction without relaxation is called a ______ contraction.

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

    Match the muscle fiber types with their primary function:

    <p>Slow fibers = Aids in lengthy exercises Fast fibers = Aids in sudden bursts of activity</p> Signup and view all the answers

    Which factor does NOT affect the degree of muscle fatigue?

    <p>Duration of sleep</p> Signup and view all the answers

    Recruitment involves the activation of muscle fibers to respond smoothly to stimuli.

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

    What is the latent period in a muscle twitch?

    <p>The delay between the stimulus application and muscle response.</p> Signup and view all the answers

    Which of the following statements about smooth muscle contraction is true?

    <p>It uses energy primarily from ATP.</p> Signup and view all the answers

    Cardiac muscle fibers are connected end-to-end to form networks and contain intercalated disks.

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

    What is the primary characteristic of cardiac muscle regarding its contraction?

    <p>Self-exciting and rhythmic</p> Signup and view all the answers

    Smooth muscle contraction can sustain forceful contractions longer with the same amount of ______.

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

    Match the following properties to their respective muscle types:

    <p>Smooth Muscle = Can change length without changing tension Skeletal Muscle = Voluntary control Cardiac Muscle = Does not develop oxygen debt All Muscle Types = Contains actin and myosin</p> Signup and view all the answers

    What is the role of a synergist muscle?

    <p>To assist the prime movers</p> Signup and view all the answers

    Muscles require the stimulation of all motor units to contract effectively.

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

    What type of muscle tissue is characterized by having no striations and is not organized into sarcomeres?

    <p>Smooth muscle</p> Signup and view all the answers

    The _______ is the stationary end of a muscle.

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

    Match the following muscle types with their characteristics:

    <p>Skeletal Muscle = Voluntary and striated Smooth Muscle = Involuntary and non-striated Cardiac Muscle = Involuntary and striated</p> Signup and view all the answers

    Which of the following best describes muscle tone?

    <p>Sustained contraction of a few muscle fibers</p> Signup and view all the answers

    Peristalsis is a wave-like motion found only in skeletal muscles.

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

    What feature of visceral smooth muscle allows it to generate electrical impulses and stimulate neighboring fibers?

    <p>Self-exciting fibers</p> Signup and view all the answers

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