Overview
List the major sense organs and infer their locations. Describe the organs of smell and taste. Identify the different parts of the tongue associated with sweetness, bitterness, salty and sore taste. Draw the skin showing the different receptors present. Describe the structure of the mammalian ear. Explain the functions of the ear (hearing and balance). Describe the mammalian eye and explain the functions of its various parts. Explain the functions of the eye: - image formation - accommodation Explain the terms myopia, hypermetropia, astigmatism, cataracts and night blindness Name the kind of lens that can be used to correct myopic and hypermetropia defects.
What you'll learn
- Organ of smell
- (a) The mechanism of smelling with the help of olfactory chemo-receptions.
- (b) Adaptation for survival
- - animals that sniff for hunting e.g. dog
- - presence of chemoreceptor on butterfly (insects) antennae for sensing its environment.
- Taste buds on the tongue and the part played in tasting.
- The skin
- - sensory nerve endings or receptions associated
- with the skin
- - touch deep pressure
- - heat and pain.
- Structure of the ear's various parts.
- Organ of Sight: the eye and its various parts.
- Functions of the eye and part played by light, image formation and accommodation.
- Eye defects
- - Myopia (short-sightedness)
- - Hypermetropic
- - Astigmatism
- - Cataracts
- - Night blindness
