Chapter 8 / 10 short lessons
Homeostasis and response
Trace how the body detects a change, corrects it and coordinates a response. Then use the same cause-and-effect thinking to explain the eye.
G3 Pure Biology / K325 / 2027 syllabus
What do you think?
You sweat when you become too warm. Which part of that response actually removes heat?
Lessons
0 of 10 marked as readNegative feedback
Build a negative-feedback explanation from a change in the internal environment.
About 5 minControlling body temperature
Explain how the hypothalamus coordinates responses to an increase or decrease in body temperature.
About 6 minHormones and endocrine glands
Describe hormonal signalling and identify the islets of Langerhans as endocrine tissue.
About 4 minBlood glucose control
Compare the roles of insulin and glucagon in negative feedback.
About 6 minType 2 diabetes and glucose control
Explain type 2 diabetes, its risk factors and broad management approaches.
About 5 minWater balance and ADH
Trace the ADH pathway from detection to a change in urine volume and concentration.
About 6 minNervous coordination and reflexes
Trace a reflex response through receptors, sensory, relay and motor neurones to an effector.
About 6 minReading an eye diagram
Identify eye structures in front and horizontal views and connect them to their functions.
About 6 minAccommodation: focusing near and far
Explain accommodation using ciliary muscles, suspensory ligaments and lens shape.
About 5 minThe pupil reflex
Compare the antagonistic iris-muscle responses in bright and dim light.
About 5 minWhat you will be able to do
- Explain a control pathway from stimulus to correction.
- Compare blood glucose, temperature and water balance.
- Trace a reflex arc and distinguish nervous from hormonal coordination.
- Link eye structures to focusing and the pupil reflex.
Spaced review
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