Circulatory system

Question 1

What is it?

Answer 1

an enclosed group of blood vessels with the heart at the centre its purpose is it circulate blood around the body
- main component of the system is the heart which is a muscular pumping organ in the thorax (chest cavity) connected by blood vessels to every tissue in the body.

Question 2

The heart

Answer 2

has 4 chambers, the upper 2 are called atria + the lower 2 are called ventricles

Question 3

The chambers

Answer 3

are separated by one way valves that allow flow from atria + ventricles only.
the two sides of the heart are separated completely

Question 4

How it works

Answer 4

Deoxygenated blood is collected from the whole body through the veins + transported to the right atrium via the inferior + superior vena cavae

Question 5

2.

Answer 5

As the heart beats, it pumps blood through the valve into the right ventricle + then out of the ventricle into the pulmonary artery where it passes to the lungs for re-oxygenation.

Question 6

3.

Answer 6

Once oxygenated, the blood returns through arteries to the left atrium through the pulmonary vein then down into the left ventricle + finally out of the heart via the aorta to the rest of the body to re-oxygenate the body’s cells + tissue