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.