Chapter 10 quiz

Elasticity refers to the ability of a muscle fiber to A. stretch. B. respond to various stimuli. C. return to original shape after contracting or stretching. D. adjust the amount of force production based on the need.

C. return to original shape after contracting or stretching.

Which of the following is NOT a type of muscle? A. skeletal B. smooth C. rough D. cardiac

C. rough

Which of the followings is NOT a function of the muscles? A. generate heat B. stabilize the body positions C. serve as a calcium reserve D. produce body movements

C. serve as a calcium reserve

Creatine phosphate A. breaks down ATP. B. activates ATPase. C. supplies energy for synthesis of ATP. D. supplies energy to break ATP into ADP.

C. supplies energy for synthesis of ATP.

The binding of Ca2+ to ___ starts the contraction cycle. A. tropomyosin B. ATP C. troponin D. sarcoplasmic reticulum

C. troponin

When calcium ion concentration in the sarcoplasm is low the A. myosin stretches and the muscle relaxes. B. actin detaches from the Z discs. C. troponin-tropomyosin complex slides back over the myosin binding sites. D. muscle cell membrane releases acetylcholine.

C. troponin-tropomyosin complex slides back over the myosin binding sites.

Myofibrils are composed primarily of A. actin and myosin. B. actin and troponin. C. troponin and myosin. D. tropomyosin and myosin.

A. actin and myosin.

The oxygen-binding protein found in skeletal muscle fibers is A. hemoglobin. B. myoglobin. C. myosin. D. actin.

B. myoglobin.

The motor end plate is part of a A. motor neuron. B. skeletal muscle cell at the synapse. C. cardiac muscle cell at the intercalated disc. D. smooth muscle cell when two cells meet.

B. skeletal muscle cell at the synapse.

Which of the following does NOT have T-tubules? A. skeletal muscle B. smooth muscle C. striated muscle D. cardiac muscle

B. smooth muscle

Which type of muscle tissue is involuntary, slow in contracting, and able to regenerate considerably better than other types of muscle? A. skeletal muscle B. smooth muscle C. cardiac muscle D. striated muscle

B. smooth muscle

The sarcoplasmic reticulum A. is the cell membrane around each muscle fiber. B. stores Ca2+ when the muscle is at rest. C. opens to the outside through the sarcolemma. D. produces ATP for muscle contraction.

B. stores Ca2+ when the muscle is at rest.

A muscle fascicle is surrounded by A. sarcomysium. B. endomysium. C. epimysium. D. perimysium.

D. perimysium.

An increase in the number of active motor units in a muscle is called A. treppe. B. peristalsis. C. wave summation. D. recruitment.

D. recruitment.

Excitability refers to the ability of a cell to A. return to its original length after stretching. B. contract. C. release excitatory hormones. D. respond to a stimulus by producing an electrical signal.

D. respond to a stimulus by producing an electrical signal.

When examined under a microscope, in which type of muscle tissue are myofibrils not apparent? A. skeletal muscle B. cardiac muscle C. atrophied muscle D. smooth muscle

D. smooth muscle

For the initiation of an action potential that starts contraction in skeletal muscle fiber: A. ACh must bind to receptors on the motor end plate B. ACh must bind to the motor nerve C. acetylcholinesterase must break down ACh at the synapse D. Ca2+ must flow into the neurolemma

A. ACh must bind to receptors on the motor end plate

The term aponeurosis refers to a A. connective tissue layers that extends as a broad, flat, sheet. B. band of connective tissue that encloses entire groups of tendons. C. connective tissue sheath that encloses several tendons. D. thickened part of a muscle.

A. connective tissue layers that extends as a broad, flat, sheet.

The outermost layer of connective tissue surrounding a skeletal muscle is the A. epimysium. B. perimysium. C. endomysium. D. sarcomysium.

A. epimysium.

Which skeletal muscle fibers are the largest in diameter and contain the most myofibrils? A. fast glycolytic fibers B. slow glycolytic fibers C. slow oxidative fibers D. fast oxidative glycolytic fibers

A. fast glycolytic fibers

In the liver, some of the lactic acid is converted to A. glucose. B. myoglobin. C. ATP. D. acetylcholinesterase.

A. glucose.

This diagram represents a(n) ___. PIC A. neuromuscular junction B. sarcomere C. motor unit D. Z line

A. neuromuscular junction

Calmodulin is involved in the contraction of A. smooth muscle. B. skeletal muscle. C. striated muscle. D. cardiac muscle.

A. smooth muscle.

When ATP attaches to the myosin head A. the head detaches from actin. B. the head attaches to troponin. C. Ca2+ reacts with the ATP. D. actin and myosin both shorten

A. the head detaches from actin.

In an isometric contraction A. the muscle contracts but does not shorten. B. the muscle reduces the angle of a joint to the same degree each time it contracts. C. the muscle shortens to the same length each time it contracts. D. energy consumption is much less than in isotonic contraction because nothing moves.

A. the muscle contracts but does not shorten.

A sustained muscle contraction without partial relaxation between stimuli is called A. unfused (incomplete) tetanus. B. fused (complete) tetanus. C. recruitment. D. recovery oxygen uptake.

B. fused (complete) tetanus.

The enzyme acetylcholinesterase facilitates A. formation of acetylcholine. B. breakdown of acetylcholine. C. binding of acetylcholine with its receptors. D. the release of acetylcholine from vesicles.

B. breakdown of acetylcholine.

In tetanus, muscles undergo sustained contractions due to A. continual stimulation of motor nerves. B. continual increase of sarcoplasmic Ca2+ levels. C. continual decrease of sarcoplasmic Ca2+ levels. D. continual build up of lactic acid.

B. continual increase of sarcoplasmic Ca2+ levels.

Which of the following properties of muscle tissue is its ability to generate tension to do work? A. extensibility B. elasticity C. contractility D. excitability

C. contractility

Cardiac muscle fibers are attached to one another at A. sarcomeres. B. T-tubules. C. intercalated discs. D. A bands.

C. intercalated discs.

Smooth muscle differs from skeletal because smooth muscle A. has Z discs. B. is multi-nucleated. C. is non-striated. D. has a lot of sarcoplasmic reticulum.

C. is non-striated.

This picture represents which of the following types of contractions? PIC A. concentric B. eccentric C. isometric D. isotonic

C. isometric

Muscle contraction is triggered by impulses carried over A. sensory neurons. B. afferent neurons. C. motor neurons. D. myofibrils.

C. motor neurons.

A motor neuron and all the muscle fibers it stimulates form a A. motor end plate. B. neuromuscular junction. C. motor unit. D. fascicle.

C. motor unit.

Muscle growth due to an increase in the size of existing fibers is called A. muscular hyperplasia. B. fusion extension. C. muscular hypertrophy. D. pericytosis.

C. muscular hypertrophy.

The elevated use of oxygen after exercise is called A. recovery respiration. B. anaerobic respiration. C. recovery oxygen uptake. D. post-exercise respiratory stress.

C. recovery oxygen uptake.

The ___ is responsible for the striations of striated muscle. A. position of M lines B. position of Z discs C. position of H zones D. alternating of A bands and I bands

D. alternating of A bands and I bands