Biology Unit 3

HideShow resource information
Why are cells, tissues and organs adapted?
To take up and get rid of dissolved substances, conditions can affect the rate of transfer, which sometimes needs energy.
1 of 20
What do dissolved substances move by?
Diffusion and active transport.
2 of 20
What is Osmosis
the diffusion of water from a dilute to more concentrated solution, through a partially permeable membrane.
3 of 20
What contains sugar, water and ions.
Sports drinks
4 of 20
When the ion and water balance is disturbed what happens?
cells do not work as efficiently.
5 of 20
What does Active Transport do?
enables cells to absorb ions from very dilute solutions
6 of 20
How is and exchange surface made to be more efficient?
A large surface area, being thin for a short diffusion path, an efficient blood supply and being ventilated.
7 of 20
What increases the difficulty of exchanging materials?
size and complexity
8 of 20
In the lungs, surface area is increased by?
Alveoli.
9 of 20
In the small intestine, surface area is increased by?
Villi, with an extensive network of capillaries to absorb through diffusion and active transport
10 of 20
What are the lungs protected and separated by?
The ribcage and the diaphragm.
11 of 20
What happens to make air move in and out of the lungs?
the ribcage moves up and out and the diaphragm flattens. The changes then reverse to breathe out.
12 of 20
How does carbon dioxide enter leaves?
diffusion.
13 of 20
How is the surface ares of roots and leaves increased?
Root hairs, and for leaves, flattened shape and internal air spaces.
14 of 20
Why do plants have stomata?
to obtain carbon dioxide from the atmosphere and remove oxygen in photosynthesis
15 of 20
In what conditions is evaporation increased?
Windy, hot and dry.
16 of 20
What helps to cool the body?
sweating.
17 of 20
What is body temperature controlled by?
Thermoregulatory centre, which has receptors sensitive to blood temperature.
18 of 20
What happens if core body temperature us too high?
Blood vessels supplying skin capillaries dilate, so more blood flows through and heat is lost through radiation.
19 of 20
What happens when core body temperature is too low?
Blood vessels supplying skin capillaries constrict to reduce flow.
20 of 20

Other cards in this set

Card 2

Front

What do dissolved substances move by?

Back

Diffusion and active transport.

Card 3

Front

What is Osmosis

Back

Preview of the front of card 3

Card 4

Front

What contains sugar, water and ions.

Back

Preview of the front of card 4

Card 5

Front

When the ion and water balance is disturbed what happens?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Unit 3 specification resources »