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Question 1

SLPaper 2

1.

Outline reasons for the therapeutic use of stem cells.

[3]

2.

Describe how leaf cells make use of light energy.

[5]

3.

Explain how cells and cell components in the blood defend the body against infectious disease.

[7]

Question 2

SLPaper 2

1.

Outline how cuts in the skin are sealed to prevent blood loss.

[4]

2.

Outline how two parents could have a child with any of the four ABO blood groups.

[4]

3.

Explain how ventilation and lung structure contribute to passive gas exchange.

[7]

Question 3

SLPaper 2

1.

Describe briefly the endosymbiotic theory.

[3]

2.

Outline how photosynthesis produces glucose.

[4]

3.

Discuss the control of blood glucose levels and the consequences if they are not maintained.

[8]

Question 4

SLPaper 3

In 1628, the physician William Harvey described details of the circulation of blood for the first time. In one experiment, he tied a tight bandage around the upper arm of a volunteer to display the blood vessels in the lower arm more clearly. He pressed his finger on the blood vessel at H. At the same time, he pushed the blood in the vessel from H to O with a second finger, removing the blood as shown in the diagram. When the finger at H was released, the blood vessel refilled with blood.

1.

Identify the type of blood vessels shown in the diagram.

[1]

2.

Deduce what the experiment demonstrated about the circulation of blood.

[2]

Question 5

SLPaper 1

What is the name and source of the hormone that regulates basal metabolic rate?

Question 6

SLPaper 1

Which products are formed by the action of the enzymes protease and amylase?

Question 7

SLPaper 1

The diagram shows the male reproductive organs in front view.

Which structures are indicated by the letters X, Y and Z?

Question 8

SLPaper 2

According to the cell theory, living organisms are composed of cells.

1.

Draw the ultrastructure of a prokaryotic cell based on electron micrographs.

[3]

2.

Outline what occurs in cells in the first division of meiosis.

[5]

3.

Explain the role of cells in the defence against infectious disease.

[7]

Question 9

HLPaper 2

1.

The figure shows a tripeptide.

Label one peptide bond in this molecule.

[1]

2.

Describe the secondary structure of proteins.

[2]

3.

Outline the action taken by the diaphragm during inhalation.

[1]

Question 10

SLPaper 1

The graph shows changes in the membrane potential in an action potential.

What is the approximate value of the threshold potential?

Topic 6 - Human physiology

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