the blood and blood vessles

Question 1

plasma

Answer 1

mostly made of water, dissolved substances like oxygen, carbon dioxide, proteins, amino acids, sugar, salts, enzymes, hormones and urea

Question 2

red blood cells

Answer 2

also called erythrocytes, for oxygen transport and has a biconcave shape for an increase surface area

Question 3

white blood cells

Answer 3

also called leucocyte and involved in killing bacteria and viruses

Question 4

platelets

Answer 4

cell fragments involved in blood clotting

Question 5

arteries

Answer 5

• thick wall to cope with high pressure
• muscle tissue to contract and narrow the lumen to reduce blood flow
• elastic tissue to allow artery to stretch during systole and recoil during diastole

Question 6

veins

Answer 6

• thin walls
• valves to prevent backflow of blood

Question 7

both arteries and veins

Answer 7

• outer coat of connective tissue with collagen to protect from damage
• endothelium which is smooth to minimise friction and maintain blood flow

Question 8

capillaries

Answer 8

• wall which is a single layer of cells to minimise distance of diffusion pathway
• small lumen