Blood

Question 1

Plasma function

Answer 1

Transport dissolved substances around body
- transports co2 from organs to lungs
- transports urea from liver to kidney
- transports soluble digestion products from small intestine to other organs

Question 2

Red blood cell function

Answer 2

Transport oxygen from lungs to body cells

Question 3

Adaptations of red blood cells

Answer 3

• contain haemoglobin
• no nucleus
  = more room for haemoglobin
• biconcave disc
  = greater surface area so that oxygen diffuses in and out rapidly

Question 4

White blood cell function

Answer 4

Form part of the immune system
Eg make antibodies

Question 5

Adaptations of white blood cells

Answer 5

• contain a nucleus
  = contains DNA which encode jobs of white blood cells

Question 6

Platelets function

Answer 6

Cause blood clot

Question 7

Uses of donated blood in medicine

Answer 7

• replace blood lost during an injury
• some people given platelets from blood to help in clotting
• proteins extracted from blood can be useful eg make antibodies

Question 8

Problems of donated blood

Answer 8

• must make sure blood type is the same or immune system will reject blood and patient could die
• risk of infection

Question 9

Chemicals transported by plasma

Answer 9

• carbon dioxide
• cholesterol
• enzymes
• fatty acid

Question 10

Factors that affect cholesterol

Answer 10

Diet
Genetic makeup