An organic compound that the body needs in minute amounts is a __________.

When the right atrium contracts, the ______.

_________ are primarily used as an energy source, but unused quantities are converted into _________ and stored.

The rate and depth of breathing are affected by the following factors EXCEPT ______.

Valves are found insome ______.

What two processes combined are referred to as internal respiration?

What must be matched between donor and recipient in organ transplantation?

_________ results when a person receives a vaccine that triggers a primary immune response and leaves memory T and B lymphocytes to initiate an attack if the pathogen reenters the body.

Agranulocytes have a common stem cell called the ______.

The tunica media is found in ______.