Скачать или смотреть Life Science | Paper 1 Exam Revision | Sense Organs - Homeostasis (Grade 12 CAPS)

Master Homeostasis plus Sense Organs — Eye 👁️ and Ear 👂 — for Grade 12 CAPS or NSC — Paper 1 Human Physiology. Clear structures, functions, feedback loops, and the memo keywords markers love 🚀

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What you will learn

🌡️ Homeostasis basics: negative feedback, thermoregulation (vasodilation 🔴, vasoconstriction 🔵, sweating 💧, shivering ❄️), osmoregulation (ADH and kidneys), blood glucose (insulin ⬇️, glucagon ⬆️)

👁️ Eye: cornea, iris, pupil, lens, ciliary body, suspensory ligaments, retina (rods 🌙 vs cones 🌈), fovea, optic nerve; accommodation and pupil reflex; defects and corrections (myopia, hyperopia, astigmatism, cataracts)

👂 Ear: pinna, canal, eardrum, ossicles (malleus–incus–stapes), oval and round windows, Eustachian tube, cochlea and organ of Corti, semicircular canals (balance ⚖️); hearing pathway and common disorders (conductive vs sensorineural)

🧠 Integration: nervous vs endocrine control (fast ⚡ vs slower ⏱️ responses); stress response and exercise examples

📝 Memo keywords: receptor, stimulus, transduction, effector, response, negative feedback, accommodation, refraction, mechanoreceptor, thermoregulation, osmoregulation, vasodilation, vasoconstriction

❗ Common pitfalls: mixing receptor and effector; saying positive instead of negative feedback; endocrine vs exocrine confusion; rods vs cones mix-ups

Exam technique — Paper 1

Use flow diagrams: stimulus → receptor → CNS → effector → response

Explanations: name the structure → state the function → link the outcome

Data questions: quote numbers and trends 📈 and tie them to the feedback loop

How to use this video
Pause at each question, attempt it, then mark with our checklist to maximise your score ✅

Hashtags

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Tags

Matric Life Sciences, Grade 12 Life Sciences, Life Sciences CAPS, NSC Life Sciences, Paper 1 physiology, Sense organs Grade 12, Eye structure and function, Rods and cones, Accommodation and pupil reflex, Ear structure and function, Hearing pathway, Balance and semicircular canals, Conductive hearing loss, Sensorineural hearing loss, Nervous system Grade 12, Endocrine system hormones, Homeostasis Grade 12, Thermoregulation, Osmoregulation, Blood glucose regulation, Negative feedback, Exam tips Life Sciences, Past papers Life Sciences