10. which of the following best describes the role of atp energy in a muscle
contraction?
a. it binds actin to myosin.
b. it permits inward movement of the z-lines.
c. it stimulates the neurotransmitter receptor.
d. it blocks the action of calcium.

Plzz hurry im being timed during times of vigorous physical activity, muscles require a constant supply of oxygen. how does the body respond to these needs? a. breathing rate and heart rate both decrease. b. breathing rate and heart rate both increase. c. heart rate decreases, but breathing rate remains stable. d. breathing rate increases, but heart rate remains stable.

Acertain species of fish can have either long or short fins. the allele for long fins is dominant over the allele for short fins. a heterozygous, long-finned fish is crossed with a homozygous, short-finned fish. of the offspring, will have long fins and be , and will have short fins and be .

Other than earth, is also known to have magnetic pole reversal? a: venus b: mars c: earths moon d: the sun