The system formed by the heart, blood and blood vessels. AKA the circulatory system.

Tube along which air passes from the trachea to the lungs.

Responsible for the clotting of blood.

When blood vessels get smaller (constrict), which warms you up.

The system of organs and vessels that gets oxygenated blood to the body tissues.

The phase of the heartbeat when the heart relaxes and lets the chambers fill with blood.

The process that increases blood flow to active areas during exercise by diverting blood away from inactive areas.

Tiny blood vessels that link arteries with veins.

The amount of air inspired and expired with each normal breath.

Responsible for transporting blood; arteries, veins and capillaries.

The pressure of the blood against the walls of the walls of the blood vessels.

The phase of the heartbeat when the heart contracts and pumps blood from the chambers into the arteries.

Blood vessels that takes blood away from the heart.

Blood vessels that takes blood back to the heart.

The fluid part of blood, essential for transporting it around the body.

Contain haemoglobin and are responsible for transporting oxygen around the body.

Are vital in fighting off disease or illness.

When blood vessels get bigger (dilate), which cools you down.

The greatest amount of air that can be made to pass into and out of the lungs.

The movement of air from outside the body into the cells within tissues.

A dome-shaped muscle that separates the chest from the rest of the body.

The tube that takes air into the body. AKA the windpipe.

Smaller branches coming off the bronchi.

Tiny sacs at the end of the bronchioles, where gas exchange takes place.

A type of protein found in every red blood cell. Attaches to oxygen and transports it around the body.