How many heart chambers and what type of circulation do fish have?

In fish, for each circuit of the body the blood passes through the heart    .

How many heart chambers and what type of circulation do mammals have?

In mammals, for each circuit of the body the blood passes through the heart     .

Define pulmonary circulation.

Define systemic circulation.

True or False? In a double circulation, blood passes through the heart twice for each circuit of the body.

Why is blood returned to the heart after passing through the lungs?

What is the advantage of the left side of the heart producing high pressure?

Raising the blood pressure again means body cells receive oxygen and glucose      and more frequently.

True or False? Fish have a double circulation.