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Summary Gr 12 LS(Humans responding to environment)

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2025/2026 Written for academic year
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12th Grade
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Life Sciences
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This document contains a summary of how humans respond to the environment with a focus on the brain, neurons, the human eye, and also the human ear. Key structures and their functions are discussed as well as defects in sight and hearing. It is very comprehensive

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RESPONDING TO THE
ENVIRONMENT - HUMANS
GRADE 12 LIFE SCIENCES

, • The Central Nervous System
(brain and spinal cord)
DIFFERENT
STRUCTURE
S • The Human Eye
RESPONDIN
G TO THE • The Ear
ENVIRONME
NT

, CENTRAL NERVOUS
SYSTEM : BRAIN AND
DIFFERENT NEURONS
Brain Structure Function
Cerebrum Controls voluntary
action, high thought
processes
Cerebellum Coordinates voluntary
movements and
muscle tension
Medulla Oblongata Controls involuntary
actions such as
heartbeat
Hypothalamus Control centre for
hunger, sleep,
emotions
Corpus Callosum Connects the left and
right hemispheres of

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July 19, 2026
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2025/2026
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Summary
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GR 12 LS Summaries(Nucleic acids, Evolution, Plant Hormones, Humans responding to environment ) Exam Tips(P1)
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