U3T4 – Haemoglobin and Circulatory System

Haemoglobin and Circulatory System

1 / 25

Haemoglobin is a quaternary protein, how many polypeptide chains make up a single molecule of haemoglobin?

2

3

4

2 / 25

Why is haemoglobin described as being 'Quaternary'?

Because it contains 4 polypeptide chains.

Because it contains 4 haem groups.

Because it contains more than 1 polypeptide chain.

3 / 25

What term describes the haem groups which contain iron?

Co-factor

Prosthetic Group

Active Site

4 / 25

How many oxygen molecules can each haem group carry?

1

2

4

5 / 25

What unit do we use to measure the concentration of oxygen in the tissue?

Moles

Kilo Pascals

Percentage

6 / 25

Where in a human, is the affinity of haemoglobin for oxygen the highest?

Veins

Respiring Muscles

Percentage

7 / 25

Where in a human, is the saturation of haemoglobin with oxygen the lowest?

Respiring tissues

Arteries

Alveoli

8 / 25

On the graph, which letter shows where it is hardest for oxygen to associate?

A

B

C

9 / 25

If Carbon Dioxide concentration increases, which letter shows the direction the curve will shift?

C

D

Neither

10 / 25

What is it called, when Carbon Dioxide causes the dissociation curve to shift?

Bear Effect

Bohr Effect

Bahrain Effect

11 / 25

During the Bohr Effect, what happens to the affinity of haemoglobin for oxygen?

Lowers the affinity

Increases the affinity

It does not affect the affinity

12 / 25

Why is it useful that the Bohr Effect reduces the percentage saturation of Haemoglobin with oxygen?

reduction in saturation also causes a reduction in partial pressure, so a concentration gradient is maintained.

The oxygen has unloaded from the haemoglobin, so it can be exhaled via the lungs.

The oxygen has unloaded from the haemoglobin, so it is available for aerobic respiration in the tissues

13 / 25

In which direction ( if any), would a curve be for humming bird haemoglobin?

C

D

Same as human adult

14 / 25

In which direction ( if any), would a curve be for diving seal haemoglobin?

C

D

Same as human adult

15 / 25

In which direction ( if any) , would the curve be for human foetal haemoglobin?

C

D

Same as human adult

16 / 25

In the diagram of the human circulatory system, which letter represents the Vena Cava?

A

B

C

17 / 25

In the diagram of the human circulatory system, which letter represents the Pulmonary Vein?

A

B

C

18 / 25

What do we call the arteries which supply the heart muscle?

Myocardial Arteries

Coronary Arteries

Cardiac Arteries

19 / 25

What do we call the arteries which supply the kidneys?

Hepatic Arteries

Carotid Arteries

Renal Arteries

20 / 25

As blood moves away from the heart, it travels in which type of blood vessel?

Artery

Vein

Aterioles

21 / 25

Once blood leaves arteries, which type of blood vessel will it enter?

Veins

Arterioles

Capillaries

22 / 25

Which type of blood vessel has the widest lumen?

Atery

Vein

Arteriole

23 / 25

Which type of blood vessel has a folded endothelium?

Vein

Arterioles

Artery

24 / 25

Which type of blood vessel has the thickest muscular layer?

Vein

Arterioles

Artery

25 / 25

Capillaries are made only out of one layer of cells called endothelium. Why is this?

To increase the surface area.

To reduce the diffusion pathway.

To decrease surface area.

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