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all of the above

Which of the following is not a function of skeletal muscle?

Skeletal muscles are responsible for the pumping action of the heart.

Which of the following statements is incorrect?


The dense layer of collagen fibers that surround an entire skeletal muscle is the


Nerves and blood vessels that service the muscle fibers are located in the connective tissues of the


The delicate connective tissue that surrounds the skeletal muscle fibers and ties adjacent muscle fibers together is the


The bundle of collagen fibers at the end of a skeletal muscle that attaches the muscle to bone is called a(n)

have many nuclei

Muscle fibers differ from "typical cells" in that muscle fibers

the ability to produce large amounts of the enzymes and structural proteins needed for contraction

The advantage of having many nuclei in a skeletal muscle fiber is


Skeletal muscle fibers are formed from embryonic cells called


The cell membrane of skeletal muscle is called the


The cytoplasm of a skeletal muscle fiber is called the

transverse tubule

The series of membranous channels that surround each myofibril is the


The functional unit of a skeletal muscle fiber is the

muscle contraction

Interactions between actin and myosin filaments of the sarcomere are responsible for

M line

In a sarcomere, thick filaments are linked laterally by

Z line

Thin filaments at either end of the sarcomere are attached to the

Z line

The area of the sarcomere containing the thick filaments is the

I band

The area of the sarcomere containing only thin filaments is the

H band

The area in the center of the A band that contains only thick filaments is the

a pair of protein strands wound together

Each thin filament consists of

calcium ions

The sarcoplasmic reticulum stores

a transverse tubule and terminal cisternae

The skeletal muscle complex known as the triad consists of

myosin molecules

Cross-bridges are portions of

tropomyosin molecules

At rest, active sites on the actin are blocked by

troponin molecules

At rest, the tropomyosin molecules is held in place by

neuromuscular junction

Each skeletal muscle fiber is controlled by a neuron at a single

synaptic cleft

The space between the neuron and the muscle is the

motor end plate

Receptors for acetylcholine are located on the

transverse tubules

Action potentials are conducted into a skeletal muscle fiber by

calcium binds to troponin

Active sites on the actin become available for binding when

calcium ions

In response to action potentials arriving from the transverse tubules, the sarcoplasmic reticulum releases

myosin cross-bridges

Which of the following acts as an ATPase during the contraction cycle of muscle?

active sites on the myosin are exposed

When calcium ion binds to troponin,

diffusion of calcium into the sarcoplasmic reticulum

The most important factor in decreasing the intracellular concentration of calcium ion after contraction is

When the sarcomeres are slightly less than fully shortened, contraction cannot occur.

Which of the following statements is incorrect?

latent period

Calcium ions are released from the sarcoplasmic reticulum during the _____ of contraction.


The type of contraction represented by a single stimulus / contraction / relaxation sequence is a(n)

complete tetanus

When a muscle is stimulated repeatedly for several seconds with a constant stimulus, the amount of tension gradually increases to a maximum. This phenomemnon is called

incomplete tetanus

A muscle producing peak tension with rapid cycles of contraction and relaxation is said to be in

wave summation

If a second stimulus arrives before the relaxation phase has ended, a second, more powerful contraction occurs. This is called

complete tetanus

A muscle that is stimulated so frequently that the relaxation phase is completely eliminated is said to exhibit


The increase in muscle tension that is produced by increasing the number of active motor units is called


The type of contraction in which the muscle fibers produce increased tension but do not shorten is called

aerobic respiration

A resting muscle generates most of its ATP by

acts as an energy reserve in muscle tissue

Creatine phosphate

A and B only

During anaerobic glycolysis

only about 1/3 of the enrgy required by the muscle

At peak levels of muscle exertion the mitochondria can supply


When energy reserves in a muscle are exhausted and lactic acid levels increase, _______ occurs.

muscle fibers remain contracted

During the recovery period following exercise, all of the following are true, except

glucose is produced from lactic acid

During the Cori cycle in the liver

additional oxygen is required to metabolize the lactic acid produced during exercise

During the recovery period the body's need for oxygen is increased because

produce powerful contractions

Fast fibers

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