CH 9 A & P quiz

Both actin and myosin are found in the

A band

The myosin filaments are located in the

A band

contains only the actin filaments

I band

f the cell could no longer produce ATP, what would be the effect on the sarcoplasmic reticulum?

It would be unable to concentrate Ca+ in the sarcoplasmic reticulum.

Which of the following statements is FALSE? Skeletal muscle cells contain myoglobin. Skeletal muscle cells have T tubules. Skeletal muscle cells use creatine phosphate instead of ATP to do work. Skeletal muscle cells have glycosomes. Skeletal muscle cells are multinucleated.

Skeletal muscle cells use creatine phosphate instead of ATP to do work.

Which of the following is true? Skeletal muscle fibers contain sarcomeres; smooth muscle fibers do not. Smooth muscle lacks the thin and thick filaments characteristic of skeletal muscle. Skeletal muscle fibers tend to be shorter than smooth muscle fibers. Skeletal muscle lacks the coarse connective tissue sheaths that are found in smooth muscle.

Skeletal muscle fibers contain sarcomeres; smooth muscle fibers do not.

Of the following items listed below, which is the best description for why skeletal muscle stores glycogen. Skeletal muscle is a heavy consumer of energy. Glycogen is part of muscles rigid supporting framework. Glycogen provides a smooth surface for filaments to slide on. The glycogen is an insulating layer that helps regulate body temperature.

Skeletal muscle is a heavy consumer of energy.

When a sarcomere contracts and thin filaments move over thick filaments you would expect to see ________.

The I bands to appear smaller

The effect of a neurotransmitter on the muscle cell membrane is to modify its ion permeability properties temporarily. True or False

True

A sarcomere is the distance between two

Z discs

Identify the correct sequence of the following events. (a) Myosin generates a power stroke. (b) Ca+ binds to troponin. (c) ATP recharges the myosin head. (d) Troponin removes tropomyosin from G actin. (e) The sarcomere shortens. (f) Myosin binds to actin.

b, d, f, a, e, c

Muscle tissue can be stimulated by the nervous system. Cells with the ability to change their membrane potential have what property?

excitability

What part of the sarcolemma contains acetylcholine receptors?

motor end plate

Which of the following is the correct sequence of events for muscle contractions?

motor neuron action potential, neurotransmitter release, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke, sliding of myofilaments

The oxygen-binding protein found in muscle cells is ________.

myoglobin

The thicker filaments are the

myosin filaments

Slow oxidative muscle fibers are best suited for __________.

running a marthaon

The __________ shorten(s) during muscle contraction

sacromere

What structure in skeletal muscle cells functions in calcium storage?

sarcoplasmic reticulum

Which of the following is NOT a normal function of muscle tissue?

secreting hormones

Which of the following are correctly paired? cardiac muscle; nonstriated cardiac muscle; voluntary control skeletal muscle; voluntary control smooth muscle; striated

skeletal muscle; voluntary control

Reduction in blood flow to a muscle fiber would have the greatest effect on ________.

slow oxidative fibers

Myoglobin ________.

stores oxygen in muscle cells

The contractile, or functional, unit of a muscle fiber is __________.

the sacromere