Size And Surface Area Flashcards

1
Q

What do cells need to take in?

A

Oxygen

Nutrients

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

Why do cells need oxygen?

A

For aerobic respiration

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

What type of waste products do cells excrete?

A

Carbon dioxide

Urea

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

Why does heat need to be exchanged?

A

So organisms need to stay at the same temperature

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

What does an organisms surface area : volume ratio affect?

A

How quickly substances are exchanged

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

What type of surface are : volume ratio does smaller organisms have?

A

Higher surface area : volume ratio

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

What type of surface are : volume ratio does larger organisms have?

A

Smaller surface area : volume ratio

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

What substances do organisms need to supply all its cells with?

A

Glucose

Oxygen

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

Why do organisms need to remove waste products from every cell?

A

To avoid damaging itself

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

How do single-celled organisms transport substances?

A

Substances diffuse directly in and out of cells across the cell-surface membrane

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

What is the diffusion rate in single-celled organisms?

A

Quick because there is small distances the substances have to travel

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

Why, in multicellular organisms, is diffusion across the outer membrane too slow?

A

Some cells are deep within the body

Larger animals have a low surface area : volume ratio

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

What do multicellular organisms need to have to absorb and excrete substances?

A

Specialised exchange organs

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

What is mass transport?

A

Efficient system to carry substances to and from individual cells

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is mass transport in mammals?

A

The circulatory system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the circulatory system?

A

Blood carrying Glucose and Oxygen around the body

Also carries hormones, antibodies and waste CO2

17
Q

What does mass transport involve in plants?

A

The transport of water and solutes in the xylem and phloem

18
Q

What does the metabolic activity inside cells create?

19
Q

What does the rate of heat loss from an organism depend on?

A

Surface area

20
Q

If an organism has a large volume what is its surface area?

A

Relatively small

Making heat loss harder

21
Q

Is an organism has a smaller volume what is its surface area?

A

Relatively large

Making heat loss easier

22
Q

What type of metabolic rate does a smaller organism need?

A

High metabolic rate in order to generate enough heat to stay warm

23
Q

What type of shape do animals with a small surface area : volume ratio?

24
Q

What type of surface area : volume do animals with a less compact shape have?

A

Larger surface area : volume ratio increasing heat loss from their surface

25
What does animals with a high surface area : volume ratio tend to lose?
More water as it evaporates from their surface
26
What do small mammals living in cold regions need to do?
Eat large amounts of high energy foods such as seeds and nuts
27
What might small mammals have to kept warm when the weather is cold?
Thick layers of fur | Hibernate
28
What have larger organisms developed to help lose heat to keep cool?
Large ears to increase their surface area