Organisation: The Heart And Blood Vessles

Question 1

How many chambers does the heart have and what are their names

Answer 1

4 chambers
Right atrium
Right ventricle
Left atrium
Left ventricle

Question 2

The heart pumps blood in a double circulatory system what does this mean

Answer 2

Blood flows in two circuits
Deoxygenated blood
Oxygenated blood

Question 3

Describe the paths in which blood flows

Answer 3

Deoxygenated blood
Vena cava- right atrium- right ventricle- pulmonary artery- to the lungs where it picks up oxygen through gas exchange

Oxygenated blood
Pulmonary vein- left atrium- left ventricle- aorta- to the rest of the body

Question 4

Arteries

Answer 4

Carry blood away from the heart
Have thick muscular walls
Walls also contain elastic fibres which allow the vessel to stretch and recoil

Both of these allow the artery to withstand high blood pressure

Question 5

Veins

Answer 5

Blood pumped Towards the heart

Contains valances which prevent back flow of blood
The lumen is wide allowing low pressure blood to flow through

Question 6

Capillaries

Answer 6

Flow very close to cells to allow substance exchange

Walls are one cell thick to provide a short diffusion pathway for faster exchange of substances