An isotonic contraction is described as
Select one:
a. action potential frequency is high enough that no relaxation of muscle fibers occurs.
b. a muscle produces constant tension during contraction.
c. a muscle produces an increasing tension during contraction.
d. a muscle produces increasin...
A&P Straighterline Final Exam
Questions Answered Correctly.
An isotonic contraction is described as
Select one:
a. action potential frequency is high enough that no relaxation of muscle fibers occurs.
b. a muscle produces constant tension during contraction.
c. a muscle produces an increasing tension during contraction.
d. a muscle produces increasing tension as it shortens.
e. a muscle produces tension, but the length of the muscle is increasing - Answer b. a muscle produces
constant tension during contraction.
After contraction has occurred, the calcium is
Select one:
a. destroyed by cholinesterase.
b. chemically bound to the cross bridges.
c. secreted by the Golgi apparatus to the outside of the cell.
d. released from troponin.
e. returned to the sarcolemma. - Answer d. released from troponin.
Increased strength of a trained muscle is due to
Select one:
a. an increased number of muscle fibers.
b. the nervous system's ability to recruit a large number of motor units simultaneously.
c. elimination of unnecessary enzymes and metabolic pathways.
d. elimination of all fat deposits.
,e. elimination of unnecessary connective tissue. - Answer b. the nervous system's ability to recruit a
large number of motor units simultaneously.
Skeletal muscle fibers
Select one:
a. possess striations.
b. can contract but are not extensible or excitable.
c. do not require nerve innervation to contract.
d. increase dramatically in number after birth.
e. are found in the walls of the stomach. - Answer a. possess striations.
Which of the following correctly describes myoglobin's special function in muscle tissue?
Select one:
a. breaks down glycogen
b. synthesizes ATP
c. acts as a reservoir for oxygen
d. produces action potentials
e. stores glucose - Answer c. acts as a reservoir for oxygen
The outside of the resting plasma membrane is __________ relative to the inside of the resting plasma
membrane.
Select one:
a. positively charged
b. negatively charged
c. electrically neutral
d. recharged
,e. None of these choices is correct. - Answer a. positively charged
Fascia
Select one:
a. surrounds individual muscles.
b. separates muscle fibers.
c. connects muscles to bone.
d. is a type of muscle tissue.
e. is a type of nerve tissue. - Answer a. surrounds individual muscles.
When repolarization of the cell membrane is complete, the
Select one:
a. cell dies.
b. cell regenerates.
c. cell no longer has a potential difference across its membrane.
d. cell is no longer responsive.
e. original polarity of the cell is restored. - Answer e. original polarity of the cell is restored.
Which of the following actions is caused by contraction of skeletal muscle?
Select one:
a. contraction of the heart
b. moving your feet in walking
c. movement of food through the digestive tract
d. emptying of the urinary bladder
e. vasoconstriction - Answer b. moving your feet in walking
, What is smooth muscle tone?
Select one:
a. can rapidly develop action potentials
b. shallow invaginations of cell membrane
c. relatively constant tension maintained for a period of time
d. intracellular cytoskeleton
e. enzyme that removes phosphate from myosin - Answer c. relatively constant tension maintained for
a period of time
The sites where a chemical substance is transmitted from the presynaptic terminal of an axon to the
postsynaptic membrane of a muscle fiber are called
Select one:
a. neuromuscular junctions.
b. sarcomeres.
c. myofilaments.
d. Z disks.
e. cell body of neuron. - Answer a. neuromuscular junctions.
List the following structures in order from smallest to largest.
(1) muscle fiber
(2) myofilament
(3) myofibril
(4) muscle fasciculus
Select one:
a. 4, 2, 3, 1
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