Blood Vessels And Blood

Question 1

Adaptations of the arteries

Answer 1

Have thick muscular and elastic walls to pump blood
Small lumen squeezes the blood forward

Question 2

Adaptations of veins

Answer 2

Have thin walls - have less muscular tissue than arteries
Have a wide lumen

Question 3

Adaptations of the capillaries

Answer 3

One cell thick to allow diffusion for gaseous exchange involving oxygen and carbon dioxide

Question 4

Role of plasma

Answer 4

Liquid element of blood that allows it to flow

Question 5

Role of platelets

Answer 5

Clot the blood at the site of the wound

Question 6

What is vasoconstriction? When does it happen

Answer 6

Narrowing of the lumen to decrease blood flow happens for the arteries during exercise so that less blood is delivered to inactive areas.

Question 7

What is vasodilation and when does it happen?

Answer 7

Widening of the lumen to increase the volume of blood travelling through it it happens during exercise so more blood is delivered to active areas increasing oxygen supply