40 Questions
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.
False
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.
False
Creatine phosphate + ADP ightarrow Creatine + ATP
True
Aerobic Respiration: $Glucose + Oxygen ightarrow Carbon Dioxide + Water + Heat + 32 ATP$
True
Glycogen is the storage form for glucose in liver and muscle cells.
True
The amount of oxygen needed after strenuous activity to perform functions such as converting accumulated lactic acid to glucose is known as oxygen surplus.
False
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.
True
Excess Postexercise Oxygen Consumption (EPOC) represents the amount of oxygen need for total aerobic activity and the amount used during that strenuous activity.
True
Muscle tissue has the ability to recoil and resume its resting length due to its elasticity.
True
Skeletal muscles are not well vascularized organs.
False
Each muscle is not supplied by a nerve ending.
False
Skeletal muscles only have one point of attachment, either origin or insertion.
False
Endomysium is a type of connective tissue that covers each individual muscle fiber.
True
Excitability of muscle tissue refers to its ability to forcibly shorten when adequately stimulated.
False
Maintenance of posture is not a function of the muscular system.
False
Heat production is not a function of the muscular system.
False
Muscle tissue types do not affect the types of movement produced.
False
Skeletal muscles may have more than one origin and/or insertion.
True
Perimysium is a loose irregular connective tissue surrounding bundles of muscle fibers known as fascicles.
False
Skeletal muscles may have more than one endomysium covering each individual muscle fiber.
False
The sarcolemma is the cell membrane of a muscle cell, while sarcoplasm is the cytoplasm containing numerous nuclei, mitochondria, glycosomes, and myoglobin.
True
Myofibrils, comprising 80% of the cell volume, consist of three kinds of protein filaments: myosin, actin, and titin.
False
The sarcoplasmic reticulum is a specialized form of smooth endoplasmic reticulum that stores calcium for muscle cell relaxation.
False
Transverse tubules are invagination tubes of the sarcolemma and are situated between two cisternae of sarcoplasmic reticulum.
True
The events of a skeletal muscle contraction involve nerve impulses, calcium release, and the formation of cross bridges between thick and thin filaments.
True
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.
True
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.
False
The fascia is fibrous connective tissue that blends with the epimysium or holds groups of skeletal muscles together.
True
Perimysium is the connective tissue surrounding an entire skeletal muscle
False
Sarcoplasm contains numerous nuclei, mitochondria, glycosomes, and myoglobin
True
Myofibrils consist of three kinds of protein filaments: myosin, actin, and tropomyosin
False
Sarcoplasmic reticulum stores calcium for muscle cell contraction
True
Transverse tubules are invagination tubes of the sarcolemma
True
The neuromuscular junction is where the end of a motor neuron communicates with the sarcoplasmic reticulum of a muscle cell
False
Muscle relaxation occurs when the nerve impulse ceases and Ach is broken down
True
Events of a skeletal muscle contraction involve calcium release and the formation of cross bridges between thick and thin filaments
True
A motor unit consists of a single motor neuron and all the muscle fibers it controls
True
Epimysium is fibrous connective tissue that blends with the perimysium
False
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
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.
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