Cameroon GCE ordinary level June 2025 human biology 2

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SECTION A

Answer THREE questions from this section

1. (a) What is a skeleton?

   (b) Give FIVE functions of the human skeleton.

   (c) Describe how movement occurs at the elbow joint.

2. (a) Draw a large and neatly labelled diagram of a cross section of the spinal cord showing the components of a reflex arc.

   OR Describe the structure of the spinal cord.

   (b) Describe the sequence of events that occurs when you mistakenly prick your finger with a needle.

   (c) How is a reflex action different from learning?

3. (a) Define nutrition.

   (b) Write short notes on the following classes of food indicating their chemical composition, basic building units, two functions and an example in each case:

   (i) Carbohydrates

   (ii) Proteins

   (iii) Lipids.

   (c) Name ONE deficiency disease caused by the absence of the following in the diet:

   (i) Calcium

   (ii) Vitamin A

   (iii) Vitamin C

   (iv) Proteins

4. (a) Draw a large and neatly labelled diagram of the general plan of human blood circulation.

   OR Describe the general plan of the human blood circulation.

   (b) Explain how a molecule of glucose absorbed in the ileum will be transported to the brain.

   (c) In tabular form state SIX differences between veins and arteries.

5. (a) Draw a large and neatly labelled diagram of a longitudinal section through the female reproductive system.

   OR Describe the structure of the longitudinal section through the female reproductive system.

   (b) Explain how:

   (i) Sex is determined in humans

   (ii) The birth process occurs.

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