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The cells in the testis responsible for producing testosterone are the…

The organ that serves as the site of exchange of nutrients and wastes between the mother and fetus is the __________.

A substance that is released into the interstitial fluid and acts on neighboring cells without first entering the blood is a(n) __________ hormone.

The __________ are the sites of sperm production within the male gonads.

Chemistry that is essential to the understanding of energy and motion is found within the field of _____.

Red-green color blindness and hemophilia are examples of __________ __________ traits. (2 words)

Harmful agents that can cause physical defects in a developing embryo are called __________.

The process by which the fetus is expelled from the uterus is __________.

The __________ are the female gonads.

The adrenal __________ releases epinephrine and norepinephrine.