Skeletal Muscle Structure and Contraction Quiz

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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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