The two organ systems involved in controlling all other systems to maintain homeostasis are the

What valve is found between the left atrium and left ventricle?

A pH of 5.5 would be considered

The hormone that lowers the calcium and phosphate ion concentration of the blood by inhibiting the release of calcium phosphate ions from the bones and by increasing the excretion of these ions by the kidneys is ____.

The body will respond to low blood pressure by

When could an Rh-negative person get antibodies to the Rh antigen?

The process where RNA makes a protein is called _____?

The tube through which the urine travels from the kidney and enters the bladder is the ____.

The smallest unit of matter is the

Which term refers to the study of how an organ functions?