Homeostasis and response

How the nervous and hormonal systems keep the body's internal conditions steady: reflexes and reaction time, blood glucose and diabetes, reproductive hormones and contraception, the brain, eye, temperature and kidneys, and plant hormones.

Start: Homeostasis and the nervous systemAbout 25 min, free

Lessons

Practise and test

Mixed reviewQuestions mixed across your lessons.

By the end you can

Describe a reflex arc from receptor to effector and explain how a synapse works
Turn ruler-drop distances into reaction times with t = √(2d ÷ g) and analyse repeat data
Explain how insulin and glucagon control blood glucose and compare type 1 and type 2 diabetes
Read hormone graphs of the menstrual cycle and compare methods of contraception and IVF
Explain accommodation, temperature control and how the kidneys balance water
Analyse seedling growth data and evaluate dialysis against a kidney transplant
Explain negative feedback with thyroxine and TSH and the action of adrenaline (Higher)
Evaluate methods of contraception and work out the costs and risks of IVF

Revision notes

Homeostasis, the nervous system and reflexes

Specifications

AQA 8461 (Biology) 4.5
AQA 8464 (Combined Trilogy) 4.5
Pearson Edexcel 1BI0 and 1SC0 Topic 7
OCR Gateway J247 and J250 B3

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