Summative Practice 12 – Question 1 – 4 (Form 4 Biology Textbook Exercise and Answer)

Question 1:
Compare the functions of the cerebellum and the medulla oblongata.

The cerebellum controls and coordinates body movement as well maintains body balance. The medulla oblongata controls involuntary responses such as peristalsis.

Question 2:
Define reflex action and state its importance.

Reflex action is defined as a rapid and automatic response without thinking. The ability to carry out reflex action is important because it protects us from harmful situations and guarantees our survival in the ever-changing environment.

Question 3:
Name the main endocrine gland in the endocrine system of humans. Why is this gland considered the main gland?

The main endocrine gland is the pituitary gland because it secretes a number of hormones that induce other endocrine glands to secrete hormones.

Question 4:
State the effects of excessive and insufficient growth hormones (GH) in humans.

Effect of deficiency — dwarfism
Effect of excess — gigantism

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