These stop the back flow of blood around the body.

Name the 2 types of chambers in the heart.

This is the main artery in the body; reaching from the heart to the abdomen.

Name the 2 types of blood which is in the heart.

What type of muscle is the heart?

What does the heart help with, in terms of living?

What is the balanced equation for respiration?

What is the name of the thick muscle wall which runs down the centre of the heart?

Why is the muscle thicker on the L than on the R?

This is found between the artia and the ventricles. It stops back flow into the atria, and it is made of strong fibres to stop it turning inside out.

This prevents back flow into the ventricle from the aorta and the pulmonary artery.

This carries deoxygenated blood from the heart to the lungs.

These are large blood vessels that receive oxygenated blood from the lungs and drain into the left atrium of the heart.