Podcast
Questions and Answers
During wave summation, the relaxation period between twitches becomes longer and longer as the muscle is stimulated at an increasingly faster rate.
During wave summation, the relaxation period between twitches becomes longer and longer as the muscle is stimulated at an increasingly faster rate.
False
The fusion of contractions to produce a continuous contraction is known as unfused (incomplete) tetanus.
The fusion of contractions to produce a continuous contraction is known as unfused (incomplete) tetanus.
False
Muscle tone is the result of voluntary signals from the nervous system in response to activated stretch receptors in muscles.
Muscle tone is the result of voluntary signals from the nervous system in response to activated stretch receptors in muscles.
False
Isometric contraction occurs when the peak tension levels are not high enough to overcome load resistance, causing the muscle to shorten.
Isometric contraction occurs when the peak tension levels are not high enough to overcome load resistance, causing the muscle to shorten.
Signup and view all the answers
Creatine phosphate + ADP
ightarrow Creatine + ATP
Creatine phosphate + ADP ightarrow Creatine + ATP
Signup and view all the answers
Aerobic Respiration: $Glucose + Oxygen
ightarrow Carbon Dioxide + Water + Heat + 32 ATP$
Aerobic Respiration: $Glucose + Oxygen ightarrow Carbon Dioxide + Water + Heat + 32 ATP$
Signup and view all the answers
Glycogen is the storage form for glucose in liver and muscle cells.
Glycogen is the storage form for glucose in liver and muscle cells.
Signup and view all the answers
The amount of oxygen needed after strenuous activity to perform functions such as converting accumulated lactic acid to glucose is known as oxygen surplus.
The amount of oxygen needed after strenuous activity to perform functions such as converting accumulated lactic acid to glucose is known as oxygen surplus.
Signup and view all the answers
Muscle fatigue can result from an inadequate supply of oxygen, a depletion of glycogen, an accumulation of lactic acid or inadequate calcium release from SR.
Muscle fatigue can result from an inadequate supply of oxygen, a depletion of glycogen, an accumulation of lactic acid or inadequate calcium release from SR.
Signup and view all the answers
Excess Postexercise Oxygen Consumption (EPOC) represents the amount of oxygen need for total aerobic activity and the amount used during that strenuous activity.
Excess Postexercise Oxygen Consumption (EPOC) represents the amount of oxygen need for total aerobic activity and the amount used during that strenuous activity.
Signup and view all the answers
Muscle tissue has the ability to recoil and resume its resting length due to its elasticity.
Muscle tissue has the ability to recoil and resume its resting length due to its elasticity.
Signup and view all the answers
Skeletal muscles are not well vascularized organs.
Skeletal muscles are not well vascularized organs.
Signup and view all the answers
Each muscle is not supplied by a nerve ending.
Each muscle is not supplied by a nerve ending.
Signup and view all the answers
Skeletal muscles only have one point of attachment, either origin or insertion.
Skeletal muscles only have one point of attachment, either origin or insertion.
Signup and view all the answers
Endomysium is a type of connective tissue that covers each individual muscle fiber.
Endomysium is a type of connective tissue that covers each individual muscle fiber.
Signup and view all the answers
Excitability of muscle tissue refers to its ability to forcibly shorten when adequately stimulated.
Excitability of muscle tissue refers to its ability to forcibly shorten when adequately stimulated.
Signup and view all the answers
Maintenance of posture is not a function of the muscular system.
Maintenance of posture is not a function of the muscular system.
Signup and view all the answers
Heat production is not a function of the muscular system.
Heat production is not a function of the muscular system.
Signup and view all the answers
Muscle tissue types do not affect the types of movement produced.
Muscle tissue types do not affect the types of movement produced.
Signup and view all the answers
Skeletal muscles may have more than one origin and/or insertion.
Skeletal muscles may have more than one origin and/or insertion.
Signup and view all the answers
Perimysium is a loose irregular connective tissue surrounding bundles of muscle fibers known as fascicles.
Perimysium is a loose irregular connective tissue surrounding bundles of muscle fibers known as fascicles.
Signup and view all the answers
Skeletal muscles may have more than one endomysium covering each individual muscle fiber.
Skeletal muscles may have more than one endomysium covering each individual muscle fiber.
Signup and view all the answers
The sarcolemma is the cell membrane of a muscle cell, while sarcoplasm is the cytoplasm containing numerous nuclei, mitochondria, glycosomes, and myoglobin.
The sarcolemma is the cell membrane of a muscle cell, while sarcoplasm is the cytoplasm containing numerous nuclei, mitochondria, glycosomes, and myoglobin.
Signup and view all the answers
Myofibrils, comprising 80% of the cell volume, consist of three kinds of protein filaments: myosin, actin, and titin.
Myofibrils, comprising 80% of the cell volume, consist of three kinds of protein filaments: myosin, actin, and titin.
Signup and view all the answers
The sarcoplasmic reticulum is a specialized form of smooth endoplasmic reticulum that stores calcium for muscle cell relaxation.
The sarcoplasmic reticulum is a specialized form of smooth endoplasmic reticulum that stores calcium for muscle cell relaxation.
Signup and view all the answers
Transverse tubules are invagination tubes of the sarcolemma and are situated between two cisternae of sarcoplasmic reticulum.
Transverse tubules are invagination tubes of the sarcolemma and are situated between two cisternae of sarcoplasmic reticulum.
Signup and view all the answers
The events of a skeletal muscle contraction involve nerve impulses, calcium release, and the formation of cross bridges between thick and thin filaments.
The events of a skeletal muscle contraction involve nerve impulses, calcium release, and the formation of cross bridges between thick and thin filaments.
Signup and view all the answers
Muscle relaxation occurs when the nerve impulse ceases, Ach is broken down, calcium is pumped back into the sarcoplasmic reticulum, and the cross bridges are broken.
Muscle relaxation occurs when the nerve impulse ceases, Ach is broken down, calcium is pumped back into the sarcoplasmic reticulum, and the cross bridges are broken.
Signup and view all the answers
A motor unit consists of a single motor neuron and all the muscle fibers it controls, with the same degree of coordination and power in different muscle groups.
A motor unit consists of a single motor neuron and all the muscle fibers it controls, with the same degree of coordination and power in different muscle groups.
Signup and view all the answers
The fascia is fibrous connective tissue that blends with the epimysium or holds groups of skeletal muscles together.
The fascia is fibrous connective tissue that blends with the epimysium or holds groups of skeletal muscles together.
Signup and view all the answers
Perimysium is the connective tissue surrounding an entire skeletal muscle
Perimysium is the connective tissue surrounding an entire skeletal muscle
Signup and view all the answers
Sarcoplasm contains numerous nuclei, mitochondria, glycosomes, and myoglobin
Sarcoplasm contains numerous nuclei, mitochondria, glycosomes, and myoglobin
Signup and view all the answers
Myofibrils consist of three kinds of protein filaments: myosin, actin, and tropomyosin
Myofibrils consist of three kinds of protein filaments: myosin, actin, and tropomyosin
Signup and view all the answers
Sarcoplasmic reticulum stores calcium for muscle cell contraction
Sarcoplasmic reticulum stores calcium for muscle cell contraction
Signup and view all the answers
Transverse tubules are invagination tubes of the sarcolemma
Transverse tubules are invagination tubes of the sarcolemma
Signup and view all the answers
The neuromuscular junction is where the end of a motor neuron communicates with the sarcoplasmic reticulum of a muscle cell
The neuromuscular junction is where the end of a motor neuron communicates with the sarcoplasmic reticulum of a muscle cell
Signup and view all the answers
Muscle relaxation occurs when the nerve impulse ceases and Ach is broken down
Muscle relaxation occurs when the nerve impulse ceases and Ach is broken down
Signup and view all the answers
Events of a skeletal muscle contraction involve calcium release and the formation of cross bridges between thick and thin filaments
Events of a skeletal muscle contraction involve calcium release and the formation of cross bridges between thick and thin filaments
Signup and view all the answers
A motor unit consists of a single motor neuron and all the muscle fibers it controls
A motor unit consists of a single motor neuron and all the muscle fibers it controls
Signup and view all the answers
Epimysium is fibrous connective tissue that blends with the perimysium
Epimysium is fibrous connective tissue that blends with the perimysium
Signup and view all the answers
Study Notes
Skeletal Muscle Structure and Contraction
- Perimysium is dense irregular connective tissue surrounding bundles of muscle fibers known as fascicles
- Epimysium is dense irregular connective tissue surrounding an entire skeletal muscle
- Fascia is fibrous connective tissue that blends with the epimysium or holds groups of skeletal muscles together
- Sarcolemma is the cell membrane of a muscle cell, while sarcoplasm is the cytoplasm containing numerous nuclei, mitochondria, glycosomes, and myoglobin
- Myofibrils, comprising 80% of the cell volume, consist of two kinds of protein filaments: myosin and actin
- Sarcoplasmic reticulum is a specialized form of smooth endoplasmic reticulum that stores calcium for muscle cell contraction
- Transverse tubules are invagination tubes of the sarcolemma and are situated between two cisternae of sarcoplasmic reticulum
- Myofilament structure includes thick filaments made of myosin and thin filaments made of actin, tropomyosin, and troponin
- The neuromuscular junction is where the end of a motor neuron communicates with the sarcolemma of a muscle cell
- Events of a skeletal muscle contraction involve nerve impulses, calcium release, and the formation of cross bridges between thick and thin filaments
- Muscle relaxation occurs when the nerve impulse ceases, Ach is broken down, calcium is pumped back into the sarcoplasmic reticulum, and the cross bridges are broken
- A motor unit consists of a single motor neuron and all the muscle fibers it controls, with different degrees of coordination and power in different muscle groups
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
Test your knowledge of skeletal muscle structure and contraction with this quiz. Learn about the components such as perimysium, epimysium, and sarcolemma, as well as the events involved in muscle contraction and relaxation. Understand the role of neuromuscular junction and motor units in muscle function.
