Haemoglobin Flashcards Preview

Biology AS > Haemoglobin > Flashcards

Flashcards in Haemoglobin Deck (21):
1

Where is haemoglobin found in humans?

In red blood cells

2

How many polypeptide chains does a haemoglobin molecule have

Four

3

Describe what is meant by haemoglobin 'loading' and 'unloading' oxygen

Loading describes oxygen binding with/ joining to haemoglobin
Unloading describes haemoglobin being released from/leaving haemoglobin

4

What is formed when oxygen is loaded onto haemoglobin

Oxyhaemoglobin

5

What is shown on an oxygen disassociation curve

How saturated haemoglobin is with oxygen at any given partial pressure of oxygen

6

Why does the binding of a single oxygen molecule increase haemoglobin's affinity for oxygen

It changes the shape of haemoglobin in a way that makes it easier for other oxygen molecules to join too

7

Where in the body would you find cells with a high partial pressure of oxygen. Explain your answer

In the alveoli/lungs.
This is the site where oxygen first enters the blood so it has the highest concentration of oxygen

8

Does haemoglobin have a primary, secondary, tertiary or quaternary structure

Quaternary

9

What kind of bio,obi all molecule is haemoglobin

A protein

10

How many polypeptide chains is haemoglobin made up of

4

11

Each chain contains a group containing iron what is this group called

A haem group

12

What does a haem group do to haemoglobin in terms of its aesthetics

Gives haemoglobin it's red colour

13

Each molecule of haemoglobin can carry how many oxygen molecules?

4

14

Where in the body does oxygen bind to haemoglobin in red blood cells to form Oxyhaemoglobin?

The lungs

15

Where in the body does oxygen leave haemoglobin

Near body cells

16

When cells respire they use up oxygen, what does this do to the partial pressure of oxygen?

Lowers it

17

Red blood cells deliver Oxyhaemoglobin to what kind of body tissues

Respiring tissues

18

Roughly describe the features of the alveoli in lungs in terms of oxygen concentration, affinity, partial pressure etc.

- HIGH oxygen conc.
- HIGH partial pressure of oxygen
- HIGH affinity
- therefore, oxygen LOADS

19

Roughly describe the features of the respiring tissues in the body in terms of oxygen concentration, affinity, partial pressure etc.

- LOW oxygen concentration
- LOW partial pressure of oxygen
- LOW affinity
- therefore, oxygen UNLOADS

20

The affinity of haemoglobin for oxygen affects what

How saturated the haemoglobin is

21

What is the role of haemoglobin

To carry oxygen around the body