Biology - The heart

What is the circulatory system made up of?

The heart, blood vessels and blood

What is the purpose of the right ventricle?

Pumps deoxygenated blood to the lungs to take into oxygen. The blood then returns to the heart

What is the purpose of the left ventricle?

Pumps oxygenated blood around all the other organs of the body. The blood gives up its ixygen at the body cells and the deoxygenated blood returns to the heart to be pumped out to the lungs again.

What are the walls of the heart mostly made out of?

Muscle tissue

What does the valves do?

The prevent the blood from flowing backwards

What is the hearts four chambers?

Right atrium, right ventricle, left atrium, left ventricle

Where does the blood flow into?

The atria from the vena cava and pulmonary vein

What happens when the atria contracts?

Pushes the blood into the ventricles

What happens when the ventricles cintract?

Forces the blood unto the pulmonary atery and the aorta and out the heart

Where does the blood flow through and returns through?

Flows to the organs and returns through the veins

Whay happens when the atria fills up again?

The cycle restarts

What are the arteries called that branch off the aorta and surround the heart?

Coronary arteries

What is the resting heart controlled by?

A group of cells in the right atrium that act as a peacemaker. These create electric impulses which spreads to surrounding muscles causing them to contract

What is the purpose of a artifical peacemaker?

Produces an electrical current to keep the heart beating regularly