specialised surfaces Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

why do cells need glucose and oxygen

A

aerobic respiration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what waste products do organisms need to excrete

A

carbon dioxide and urea

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

do small animals have a large SA:V or a small SA:V

A

large SA:V

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

why do unicellular organisms not require specialised surfaces

A

smaller diffusion pathway

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what are the three reasons why diffusion is too slow in multicellular organisms

A

some cells are deep within the body so diffusion distance is too large

low SA:V difficult to exchange as much substances

high metabolic rate using up oxygen rapidly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what are the features of an efficient exchange system

A

large surface area
thin
good ventilation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

how do root hair cells have a large SA

A

millions of microscopic hairs branching into the soil to increase surface area

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

why do root hair cells need a large surface area

A

helps to increase the rate of absorption of water by osmosis and mineral ions by active transport

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

how is the alveoli thin

A

made from a single layer of epithelial cells

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what does the thin alveoli layer allow for

A

decrease distance in which oxygen and carbon dioxide diffuse increasing diffusion rate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

how does the alveoli have good ventilation

A

surrounded by a large capillary network constantly delivering oxygen and removing CO2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

why does the alveoli need a good blood supply

A

maintain concentration gradients of oxygen and carbon dioxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

how do fish gills have good ventilation

A

large network of capillaries keeping them supplied with blood with fresh water constantly flowing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

why do fish need good ventilation

A

maintain concentration gradients of oxygen and carbon dioxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly