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__________ coordinate immune defenses and kill organisms in cells on contact.

__________ coordinate immune defenses and kill organisms in cells on contact.

The __________ is the functional unit of the kidney.

A zygote is created when two __________ unite.

A zygote is created when two __________ unite.

Sperm cells are produced in the _________.

Which hormone causes the uterus to contract during and after childbirth?

__________ in certain arteries are sensitive to carbon dioxide and pH changes in the blood.

__________ in certain arteries are sensitive to carbon dioxide and pH changes in the blood.

When the distance between the ends of a contracting muscle increases, the isotonic contraction is said to be _____.