Muscle contraction is triggered
A. by the nerve releasing a neurotransmitter, which triggers a flow of calcium that releases ATP and begins the actin filaments sliding across the myosin binding sites.
B. by release of a neurotransmitter at a synapse that directly causes actin and myosin to slide.
C. by the nerve releasing a neurotransmitter, which triggers a flow of calcium that attaches to actin filaments and exposes the myosin binding sites.
D. when high levels of oxygen and sugar are released by the sarcolemma.
E. when a surplus of ATP is released by a nerve motor unit.
Answer: C
You might also like to view...
The ascending portion of the loop of Henle is
A. permeable to water and impermeable to sodium. B. permeable to water and permeable to sodium. C. impermeable to water and permeable to sodium. D. impermeable to water and impermeable to sodium. E. the site of active transport of water.
Polyandry is the mating system in which ____
a. one male and one female form a long-term association b. both males and females mate with multiple partners c. one male mates with many females d. one female mates with many males e. both males and females provide care to offspring
The process by which the movement of internal bonds converts one type of organic compound into another is ____
a. condensation b. cleavage c. functional group transfer d. electron transfer e. rearrangement
An allele at locus A is more likely than an allele at locus B to remain linked to the allele for barred eyes.
a. true b. false