circulatory system

Question 1

5 functions of the circulatory system

Answer 1

• pump blood around the body
• transport O2 around the body
• transport CO2 and waste away from cells
• Maintain body temp
• fight infection

Question 2

Structure of heart

Answer 2

There are four chambers:
* right atrium
* right ventricle
* left atrium
* left ventricle

Question 3

Arteries

Answer 3

carry oxygenated blood away from the heart, have thick muscular walls, no valves, and blood is under high blood pressure.

Question 4

Veins

Answer 4

carry de-oxygenated blood towards the heart, have thin collapsable walls, they have valves, and blood is under low blood pressure.

Question 5

Capillaries

Answer 5

Allows the passing of oxygen to tissues and removes CO2, has very thin walls, and branch off from arterioles and venules to form networks.

Question 6

Process of heart

Answer 6

Deoxygenated blood > vena cave > right atrium > right ventricle > pulmonary artery > lungs > intake O2 and removal CO2 and waste > oxygenated blood > pulmonary veins > left atrium > left ventricle > aorta > around the body