Circulation

A disorder in which a person's blood pressure is consistently higher than normal is called

Hemoglobin is a protein that binds easily to

The largest artery of the body is called the

Valves in the heart help control the direction of blood flow.

Taking blood from one person and giving it to another is

Plasma is mostly composed of

Tiny blood vessels with very thin walls are

Which of the following structures pumps blood into arteries leading to the lungs?

At the site of a wound, platelets set off reactions that cause the production of

The network of vessels that returns fluid to the bloodstream is called the

Pieces of cells that help blood clot are

Which of the following is NOT a characteristic of a vein?

A group of cells that sends out signals that make the heart contract is the

The organ that pumps blood is the

Capillary walls must be very thick to withstand the high force of blood pumped by the heart.

The force of the heart's contracting atria causes blood pressure.

White blood cells defend the body against disease.

Platelets are cell fragments that help form red blood cells.

If your blood pressure is higher than 140/90, you have

A vessel that carries oxygen-rich blood to the heart muscle is called a(n)