quiz 23

Question 1

Describe the adaptations of the small intestine for absorbing small food molecules into the bloodstream

Answer 1

villi and micro-villi, good blood supply and thin membranes

Question 2

Why is the small intestine membrane an exchange surface?

Answer 2

it exchanges small nutrient molecules from inside the small intestine to the bloodstream

Question 2

As surface area to volume ratio decreases, what happens to the rate of diffusion of oxygen and nutrients into organisms?

Answer 2

decreases

Question 3

Describe the adaptation of gills for gas exchange

Answer 3

highly folded gills,good blood supply,thin membranes,well ventilated by water

Question 4

What 2 structures do larger organisms have in order to keep rate of diffusion high?

Answer 4

Exchange surfaces and transport systems

Question 5

What is the surface area to volume ratio?

Answer 5

The ratio of the total surface area of a cell or organism to its volume

Question 6

In order, list the structures air passes through as it breathed in

Answer 6

Mouth,trachea,bronchi,bronchioles and alveoli

Question 7

Explain why exchange surfaces are folded

Answer 7

so they have a large surface area, increasing the rate of diffusion

Question 8

Explain why exchange surfaces have a good blood supply

Answer 8

To maintain a steep concentration gradient, which increases the rate of diffusion

Question 9

As a cell increases in size, what happens to its surface area to volume ratio?

Answer 9

surface area to volume ratio decreases

Question 10

Explain why exchange surfaces have thin membranes

Answer 10

so the diffusion distance is shorter which increases the rate of diffusion

Question 11

Ho do nutrients we eat reach the bloodstream?

Answer 11

Diffusion from the small intestine

Question 12

Describe adaptations of the lungs for gas exchange

Answer 12

Highly folded alveoli,good blood supply, thin membranes and well ventilated by air

Question 13

List 2 exchange surfaces in humans

Answer 13

small intestine and alveoli