Revision for Biology 3a

HideShow resource information
Give an example of a particle can't pass through a partially permeable membrane
Sucrose
1 of 32
How does CO2 get into the cells of a leaf?
It diffuses through stomata
2 of 32
Name the main substances that diffuse out of leaves
Oxygen and water vapour
3 of 32
In what conditions does evaporation of water from leaves happen most quickly in?
Hot, dry and windy
4 of 32
Define ventilation
The movement of air in and out of the lungs
5 of 32
Give the four ways that the alveoli's structure is ideal for gas exchange
1. Enormous surface area 2. Moist lining for dissolving gases 3. Very thin walls 4. Good blood supply
6 of 32
What are root hair cells specialised to do?
Absorb water and minerals
7 of 32
Give the two main differences between active transport and diffusion
1. Active transport requires energy and diffusion doesn't 2. Active transport works against a concentration gradient and diffusion works along a concentration gradient
8 of 32
What do phloem tubes do?
Transport food substances made in the leaves to growing regions and storage organs of the plant
9 of 32
What do xylem tubes do?
Carry water and minerals from the roots to the stem and leaves
10 of 32
What is the transpiration stream?
The flow of water through a plant, from the roots to the leaves, via the xylem vessels
11 of 32
Why is our circulatory system called a double circulation system?
Blood flows to and returns from the lungs in the first pump, and the second one pumps blood all around the rest of the body
12 of 32
What do the atria do in the heart?
They contract, pushing the blood into the ventricles
13 of 32
What do the ventricles do?
They contract, forcing the blood into the pulmonary artery and the aorta, and out of the heart
14 of 32
Why do arteries need very muscular, elastic walls?
To allow them to stretch and not break under the high pressure of the blood flowing through them
15 of 32
How are capillaries adapted to their function?
They have very thin walls (only one cell thick), which increases the rate of diffusion by decreasing the distance at which it occurs
16 of 32
What the substance in red blood cells called?
Haemoglobin
17 of 32
What is this substance called when it combines with oxygen?
Oxyhaemoglobin
18 of 32
What are platelets and what do they do?
They are small fragments of cells that help blood to clot
19 of 32
Why is it important that blood can clot?
To stop you bleeding out and to stop microorganisms getting in
20 of 32
Explain how artificial blood products can help keep people alive
It replaces a lost volume of blood (e.g. in an accident), and gives someone enough time to produce more blood cells so that they don't die
21 of 32
Name a part of the heart that can be replaced with artificial parts
Heart valves
22 of 32
State one potential complication for using artificial parts in the heart
Problems with blood clots
23 of 32
What are stents and what do they do?
They are tubes that are inserted inside arteries. They keep them open, making sure that blood can pass through to the heart muscles
24 of 32
Define homeostasis
Homeostasis is the maintenance of a constant internal environment
25 of 32
Name the four things that the body needs to keep fairly constant
1. Body temperature 2. Water content 3. Ion content 4. Blood sugar levels
26 of 32
Where in the body is urea produced?
The liver
27 of 32
What are the three ways that water can be lost from the body?
1. In urine 2. In sweat 3. In the air we breathe out
28 of 32
Explain why your urine is likely to be more concentrated on a hot day
On a hot day, you sweat a lot, so you'll produce less urine which will be more concentrated
29 of 32
Give two ways in which kidney failure can be treated
1. Kidney transplant 2. Kidney dialysis machine
30 of 32
Describe what happens when blood glucose level is too high
Insulin in secreted by the pancreas, which makes the liver turn glucose into glycogen
31 of 32
Give two ways in which type 1 diabetes can be controlled
1. Avoiding foods rich in simple carbohydrates 2. Injecting insulin into the blood at mealtimes
32 of 32

Other cards in this set

Card 2

Front

How does CO2 get into the cells of a leaf?

Back

It diffuses through stomata

Card 3

Front

Name the main substances that diffuse out of leaves

Back

Preview of the front of card 3

Card 4

Front

In what conditions does evaporation of water from leaves happen most quickly in?

Back

Preview of the front of card 4

Card 5

Front

Define ventilation

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 resources »