A vessel that carries oxygen rich blood to the heart muscle is called

A group of cells that receives messages about the body's oxygen needs and sends out signals to adjust the heart rate is called the

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

Plasma is mostly composed of

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

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

The largest artery in the body is called the

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

Hemoglobin is a protein that binds easily to

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

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