quiz 2

Question 1

Through which blood vessel does blood flow away from the heart?

Answer 1

Arteries

Question 2

Through which blood vessel does blood flow back into the heart?

Answer 2

veins

Question 3

Which blood vessels have thick walls containing muscle tissue and elastic fibres?

Answer 3

Arteries

Question 4

Give an adaptation of the small intestine which improve absorption of digested molecules

Answer 4

structures called villi increase the surface area for increased diffusion into the blood

Question 5

How does stomach acid help digestion?

Answer 5

1.it breaks up large particles of proteins. 2.it provides an optimum PH for protease enzymes

Question 6

Name 2 factors that can affect the shape of an enzymes active site

Answer 6

PH and high temperature

Question 7

what do lipases break down and what is produced?

Answer 7

Lipids(fats) to fatty acids and glycerol

Question 8

which blood vessels have thinner walls and contain valves?

Answer 8

Veins

Question 9

what do proteases break down and what is produced?

Answer 9

proteins to amino acids

Question 10

what happens when an enzyme is denatured?

Answer 10

its active site changes shape so it cant join the substrate