Category Archives: 13. Excretion in Humans & 14. Coordination & Response & 15. Drugs

IGCSE Bio Topic 14 – Coordination & Response

For self-assessment questions, with exercises and discussions, just click on the correct topic at Biology GCSE & IGCSE Question Bank. The s-cool revision site lets you revise the topic, summarizes the topic & tests you on it. Skoool gives you a lesson, including progress questions, for each Biology topic but you’ll need sound on for it. GCSE Bitesize has revision pages (that take you through the topic), a test and an activity.

An excellent powerpoint that covers it all:

14.1 Nervous Control in humans & 14.2 Sense Organs

14.1 Nervous Control notes and 14.2 Sense Organs notes in downloadable word format.

A lesson on Nervous System and Reflex Arc from Mr Dare:

A lesson on the Eye and Pupil Reflex from Mr Dare:

And finally, a lesson on Accommodation from Mr Dare:

Science Bank 15 (Responding to Stimuli): Part 1 – the Eye (to 5m 30s); Part 2 – the Nervous System (to 9m 25s):

GCSE Bitesize revises The Nervous System (in 8m 27s) and here’s a short (less than 5 minute) video clip from BBC iScience – The Eye.

Other videos include Science in Focus – Wired Nervous System (22m 51s), The Virtual Body – Sensory Systems (19m) & BBC Short Circuit The Eye (19m).

14.4 Homeostasis

A good powerpoint that includes osmoregulation:

Homeostasis of the body from Claire Gaukrodger

14.4 Homeostasis notes in downloadable word format.

A lesson on Thermoregulation from Mr Dare:

Science Bank 16 (Homeostasis): part 1 – controlling Temperature (to 5m 10s), part 2 – controlling Water Levels (to 9m) & part 3 – controlling Blood Sugar Level (to 14m 10s):

A powerpoint can be downloaded from here, a 5m 33s animation on Homeostasis is here & this link to GCSE Bitesize will help you revise the topic.

Videos include The Virtual Body – Homeostasis (19m), Homeostasis – The New Living Body (19m) & BBC Short Circuit Homeostasis (19m).


14.5 Tropic Responses

Tropisms from Marthese Azzopardi

Science Bank 15: Part 3 covers Plant Tropisms (from 9m 25s to 14m 30s):

14.5 Tropic responses notes in downloadable word format.


A 3 minute introduction to tropisms (from Twig World).

Plant Control – Paul Andersen explains how plants use hormones to respond to their environment. We only need to know about auxins (to 3m 40s).