1 a sperm and ova are known as and when they fuse they form

1.

a) sperm and ova are known as _______, and when they fuse they form a?

b) Peptide hormones typically affect a cell by?

c)After estrogen treatment, increases in the size of _______ may be observed in the VMH of female rats?

d)n rats, the refractory period lasts, on average,

Solution

A. Gamete and zygote.

B. Peptide hormone typically acts on cells by binding to its cells surface receptor and activating the secondry messenger thus producing cellular response.

C. Estrogen treatment, increases in the size of breasts.

D. Refractory period in rats is about 15 minutes