Give three examples of reflex actions in the human body.
Show Solution
(i)
A reflex action is an involuntary/unconscious/sudden movement/response to a stimulus.
(ii)
Examples of reflex actions in the human body
1. Heart beat
2. Peristalsis
3. Pupil of the eye changes in size when faced with bright light
4. Digestion of food by enzymes
5. Breathing
2.
Distinguish between excretion and egestion.
Show Solution
Distinction between excretion and egestion
Excretion is the elimination/removal of metabolic waste products from (tissues of) the body while
egestion is the elimination of undigested food materials from the alimentary canal.