Exam 4: Muscle Physiology Questions Part 1

The sites where a chemical substance is transmitted from the presynaptic terminal of an axon to the postsynaptic membrane of a muscle fiber are called

• sarcomeres

• cell body of neuron

• myofilaments

• Z disks

• neuromuscular junctions

A condition in which stimuli occur so rapidly that there are no intervening relaxations between contractions is called

• complete tetanus

• treppe

• all or none tetanus

• involuntary paralysis

• incomplete tetanus

Which statement concerning slow-twitch oxidative muscle fibers is false?

• They are well adapted to anaerobic activity.

• They have large deposits of myoglobin.

• They have a well developed blood supply.

• They have low glycogen stores.

• They split ATP slowly.

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NGSS.HS-LS2-3

List the following structures in order from smallest to largest: (1) muscle fiber, (2) myofilament, (3) myofibril, (4) muscle fasciculus

• 4, 2, 3, 1

• 2, 3, 1, 4

• 1, 2, 3, 4

• 3, 1, 4, 2

• 2, 1, 4, 3

Tags

NGSS.HS-LS1-2

A sarcomere is the

• structural and functional unit of the skeletal muscle cell.

• cell membrane of a muscle fiber.

• cytoplasm of muscle cells.

• protein strand composed of actin or myosin.

• contractile thread that extends the length of the muscle fiber.

Which type of respiration occurs in the mitochondria?

• anaerobic respiration

• aerobic respiration

• both anaerobic and aerobic respiration

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NGSS.HS-LS1-7

After their wedding vows, a bride and groom often ceremonially use which of the following muscles before walking away from the altar?

• quadriceps femoris

• orbicularis oris

• platysma

• levator labii superioris

• depressor anguli oris

Which type of muscle tissue is multinucleated?

• smooth muscle

• both cardiac and smooth muscle

• skeletal muscle

• cardiac muscle

• both skeletal and cardiac muscle

Aerobic exercise

• can increase the number of mitochondria in muscle cells.

• increases vascularity of muscle.

• develops fatigue-resistant fast-twitch fibers.

• can increase the efficiency of slow-twitch fibers.

• All of these choices are correct.

Tags

NGSS.HS-LS2-3

Synaptic vesicles in the neuromuscular junction contain

• acetylcholine.

• ATP.

• sodium.

• acetylcholinesterase.

• calcium.