Chapter 4 - Organising Animals And Plants

Question 1

Blood plasma

Answer 1

• Liquid part of blood, a pale yellow colour

- plasma transports many dissolved substances around the body

Question 2

Red blood cells

Answer 2

• very small in size, most common, give blood its red colour, they are shaped like discs, doesn’t have a nucleus
• to transport oxygen to all the body cells for respiration

Question 3

White blood cells

Answer 3

• much bigger then red blood cells, they have a nucleus

- some white blood cells (lymphocytes) form antibodies against microorganisms

Question 4

Platelets

Answer 4

• small fragments of cells, doesn’t have a nucleus

- help to form blood clots to seal wounds, they are formed when large cells break down into smaller pieces

Question 5

Arteries

Answer 5

• Thick, muscular, elastic wall with a narrow lumen

- they carry blood away from the heart, blood is under very high pressure, carry oxygenated blood

Question 6

Vein

Answer 6

• thin wall with a large lumen

- carry blood to heart, blood is under low pressure, carry deoxygenated blood

Question 7

Capillaries

Answer 7

• wall is one cell thick with a very small lumen

- tiny blood vessels, allow the exchange of substances

Question 8

Stent

Answer 8

A tube that is put in the artery to allow blood to go through it

Question 9

Pacemaker

Answer 9

They are electrical devices to correct irregularities in the heart rate

Question 10

Statins

Answer 10

They work to lower the level of chlorestrial in your blood