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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.

The mixture of seminal fluids and sperm that is ejaculated from the penis is termed __________.

The brain and spinal cord develop from the embryonic feature termed the  __________  __________.  (2 words)