GAP Unit 3

A muscle ________ contains a sarcolemma, sarcoplasm, myofilaments, and myofibrils.

fiber

The term used to describe muscular growth in response to usage is

hypertrophy

Which of the following occurs when tension production rises to a peak and very brief periods of relaxation occur?

incomplete tetanus

Glycolysis

is the breakdown of pyruvate to glucose.

Regarding lactic acid regulation, which cells in the body consume extra oxygen and produce ATP for the conversion of excess lactate absorbed from the blood back to glucose?

liver cells

During activities requiring aerobic endurance,

most of the muscle's energy is produced in mitochondria

The specialized sarcolemma that contains acetylcholine receptors is the

motor end plate

Neurotransmitters that cause skeletal muscle contraction are normally stored in

motor neuron axon terminals

After death, rigor mortis lasts until

myofilaments are broken down.

Muscle cells

possess a mechanism that regulates the tension amount by changing the number of contracting sarcomeres.

The area between Z lines is the

sarcomere

A person whose genetic makeup makes him or her a better marathon runner than a sprinter probably has more ________ in his or her leg muscles.

slow fibers

Nonstriated, involuntary muscle is

smooth

The muscle that adducts and medially rotates the shoulder is the

teres major

Rigor mortis occurs at death due to a lack of

ATP

Which statement regarding isometric contractions is true?

The tension produced never exceeds the load

Myofibrils are made primarily of

actin and myosin

Smooth muscle cells

are spindle-shaped.

Which statement regarding "heat loss" is true?

Muscle contractions play an important role in the maintenance of normal body temperature

Which statement regarding skeletal muscle is true?

Skeletal muscles contain blood vessels.