arterys and veins

Question 1

What has a valve in it

Answer 1

viens

Question 2

Why do veins need valves

Answer 2

to reduce blood back flow

Question 3

arteries

Answer 3

Carry blood away from the heart
carry oxygenated blood (except for pulmonary artery)
Have which muscular walls that contain elastin fibres to withstand high pressure of blood (but no valves)
narrow lumber to maintain high pressure
Arteries expand when the pressure of the blood rises and recoil when the pressure falls

Question 4

Veins

Answer 4

Carry blood towards the heart from the body

carry deoxygenated blood (except pulmonary vein)

Question 5

Capillaries

Answer 5

Small numerous blood vessels found in all tissues
They have thin walls so substances can easily diffuse in and out of them
have leaky walls so blood can leak out and form tissue fluid surrounding cells

Question 6

What is an arteriole

Answer 6

a tiny artery

Question 7

What is a venue

Answer 7

a mini vien

Question 8

lymph

Answer 8

Lymph is blood that leaks from a capillaries and turns into tissue fluid and then turns into lymph