Norepinephrine and epinephrine cause an increase in heart rate (hr) and stroke volume (sv), which is the amount of blood pumped out during each heartbeat. this effect is enhanced when thyroid hormone (th) is also present. th has little effect on hr and sv alone. what is the effect of th on hr and sv called?

Permissiveness

Explanation:

Permissiveness is a biochemical process in which the presence of hormones is required for other hormones that exert its full effects on target cells. Hormones can interact in permissive, synergistic and antagonistic ways. In permissiveness, one hormone must present for full effect and the other hormone. For example, the thyroid hormone increases epinephrine. Permissiveness related to the traits that make a person submissive. Permissiveness has a great role in biology as well as psychological traits.

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