Essay
ACCOMMODATION, HEARING AND BALANCE ESSAY
- Course
- Life Science Grade 12 Essays
- Institution
- Public School
Easy to read essay on ACCOMMODATION, HEARING AND BALANCE
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A goalkeeper in a soccer match prevented a goal from being scored when he dived to his rightafter the ball was kicked towards him. Just before he dived, he heard his team-mate shout,
‘'your ball”.
Describe how his eyes adjusted to see the ball as it travelled towards him and describe how
he heard his team-mate and maintained his balance as he dived to save the ball.
As the ball moved towards the goalkeeper:
Accommodation took place
• Ciliary muscles contracted
• Suspensory ligaments became slack
• This reduced the tension on lens
• Lens became more convex/round
• Refractive power of the lens increased
• Image of the ball fell on the retina Any 5
Hearing The shout of his team-mate was heard by the goal keeper as follows:
• The sound waves were directed by the pinna
• through the auditory canal
• to the tympanic membrane/eardrum
• causing it to vibrate
• The vibrations of the tympanic membrane were transferred to the ossicles
• in the middle ear - which eventually caused the oval window to vibrate
• This set up pressure waves in the cochlea
• This stimulated the Organ of Corti in the cochlea
• to convert this stimulus into a nerve impulse
• which was then transmitted along the auditory nerve
• and interpreted in the cerebrum Any 6
Balance and equilibrium As he dived:
• A change in the direction and speed of the body
• causes the movement of fluid in the semi-circular canals
• which stimulates the cristae
• A change in the position of the head
• stimulated the maculae
• in the utriculus and sacculus
• The stimuli were converted into impulses
• which were transported along the auditory nerve
• and interpreted in the cerebellum
• which then sent impulses to the muscles
• to restore balance and equilibrium Any 6
Content 17
Synthesis - relevance 1
- Logical sequence 1
- Comprehensiveness 1
Total = 20
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