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Which characteristic of muscle tissue refers to the ability to forcibly shorten when adequately stimulated?
Which characteristic of muscle tissue refers to the ability to forcibly shorten when adequately stimulated?
What is the function of skeletal muscles related to the types of movement?
What is the function of skeletal muscles related to the types of movement?
What type of attachment refers to the stationary/fixed attachment point of a skeletal muscle while contracting?
What type of attachment refers to the stationary/fixed attachment point of a skeletal muscle while contracting?
What covers each individual muscle fiber and is composed of fine areolar connective tissue?
What covers each individual muscle fiber and is composed of fine areolar connective tissue?
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What is the result of more calcium being available in the cytoplasm from the previous twitch?
What is the result of more calcium being available in the cytoplasm from the previous twitch?
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What is the adding together of force of contractions due to successive stimuli applied to a muscle forming a stronger contraction?
What is the adding together of force of contractions due to successive stimuli applied to a muscle forming a stronger contraction?
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What is the fusion of contractions to produce a continuous contraction?
What is the fusion of contractions to produce a continuous contraction?
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What is the enzyme found in myosin filaments that causes the reaction: $ATP
ightarrow ADP + P + energy$?
What is the enzyme found in myosin filaments that causes the reaction: $ATP ightarrow ADP + P + energy$?
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What is the storage form for glucose in liver and muscle cells?
What is the storage form for glucose in liver and muscle cells?
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What is the molecule in muscle cells which stores O2?
What is the molecule in muscle cells which stores O2?
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What is the state of physiological inability to contract even though a stimulus is provided?
What is the state of physiological inability to contract even though a stimulus is provided?
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What is the extra amount of energy the body must take in to recover after vigorous exercise has occurred?
What is the extra amount of energy the body must take in to recover after vigorous exercise has occurred?
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What is the amount of O2 needed after strenuous activity to perform functions such as converting lactic acid to pyruvic acid and rebuilding ATP and CP reserves?
What is the amount of O2 needed after strenuous activity to perform functions such as converting lactic acid to pyruvic acid and rebuilding ATP and CP reserves?
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What is the state of almost always slightly contracted in skeletal muscles, due to involuntary signals from the nervous system in response to activated stretch receptors in muscles?
What is the state of almost always slightly contracted in skeletal muscles, due to involuntary signals from the nervous system in response to activated stretch receptors in muscles?
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What is the process of adding together the force of contractions due to successive stimuli applied to a muscle, forming a stronger contraction?
What is the process of adding together the force of contractions due to successive stimuli applied to a muscle, forming a stronger contraction?
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What is the result of recruiting more motor units to smoothly increase the force of muscle contraction as more muscle fibers contract?
What is the result of recruiting more motor units to smoothly increase the force of muscle contraction as more muscle fibers contract?
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What is the specialized form of smooth endoplasmic reticulum that stores calcium for muscle cell contraction?
What is the specialized form of smooth endoplasmic reticulum that stores calcium for muscle cell contraction?
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What is the fibrous connective tissue that blends with the epimysium or holds groups of skeletal muscles together?
What is the fibrous connective tissue that blends with the epimysium or holds groups of skeletal muscles together?
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What consists of two kinds of protein filaments, myosin, and actin, and makes up 80% of the cell volume?
What consists of two kinds of protein filaments, myosin, and actin, and makes up 80% of the cell volume?
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Where does the end of a motor neuron communicate with the sarcolemma of a muscle cell?
Where does the end of a motor neuron communicate with the sarcolemma of a muscle cell?
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What is the physiological inability of a muscle to contract despite the provision of a stimulus?
What is the physiological inability of a muscle to contract despite the provision of a stimulus?
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What is the cell membrane of a muscle cell?
What is the cell membrane of a muscle cell?
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What is the dense irregular connective tissue surrounding an entire skeletal muscle?
What is the dense irregular connective tissue surrounding an entire skeletal muscle?
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What is the structure that consists of thick filaments made of myosin and thin filaments made of actin, tropomyosin, and troponin?
What is the structure that consists of thick filaments made of myosin and thin filaments made of actin, tropomyosin, and troponin?
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What is the attachment point of a skeletal muscle that is stationary/fixed while contracting?
What is the attachment point of a skeletal muscle that is stationary/fixed while contracting?
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What is the physiological process that involves nerve impulses, calcium release, and the formation of cross-bridges between thick and thin filaments?
What is the physiological process that involves nerve impulses, calcium release, and the formation of cross-bridges between thick and thin filaments?
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What is the functional unit of a skeletal muscle, consisting of the area between two Z discs?
What is the functional unit of a skeletal muscle, consisting of the area between two Z discs?
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What is the structure that is composed of fine areolar connective tissue and covers each individual muscle fiber?
What is the structure that is composed of fine areolar connective tissue and covers each individual muscle fiber?
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What is the dense irregular connective tissue surrounding bundles of muscle fibers known as fascicles?
What is the dense irregular connective tissue surrounding bundles of muscle fibers known as fascicles?
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What is the fibrous connective tissue that blends with the epimysium or holds groups of skeletal muscles together?
What is the fibrous connective tissue that blends with the epimysium or holds groups of skeletal muscles together?
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What is the cell membrane of a muscle cell?
What is the cell membrane of a muscle cell?
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What is a specialized form of smooth endoplasmic reticulum that stores calcium for muscle cell contraction?
What is a specialized form of smooth endoplasmic reticulum that stores calcium for muscle cell contraction?
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What comprises 80% of the cell volume and consists of two kinds of protein filaments: myosin and actin?
What comprises 80% of the cell volume and consists of two kinds of protein filaments: myosin and actin?
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Where does the end of a motor neuron communicate with the sarcolemma of a muscle cell?
Where does the end of a motor neuron communicate with the sarcolemma of a muscle cell?
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What is the structure that consists of thick filaments made of myosin and thin filaments made of actin, tropomyosin, and troponin?
What is the structure that consists of thick filaments made of myosin and thin filaments made of actin, tropomyosin, and troponin?
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What is the physiological process that involves nerve impulses, calcium release, and the formation of cross bridges between thick and thin filaments?
What is the physiological process that involves nerve impulses, calcium release, and the formation of cross bridges between thick and thin filaments?
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What is the result of recruiting more motor units to smoothly increase the force of muscle contraction as more muscle fibers contract?
What is the result of recruiting more motor units to smoothly increase the force of muscle contraction as more muscle fibers contract?
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What is the physiological inability of a muscle to contract despite the provision of a stimulus?
What is the physiological inability of a muscle to contract despite the provision of a stimulus?
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What is the functional unit of a skeletal muscle, consisting of the area between two Z discs?
What is the functional unit of a skeletal muscle, consisting of the area between two Z discs?
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What is the fusion of contractions to produce a continuous contraction?
What is the fusion of contractions to produce a continuous contraction?
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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
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
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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.
