1. Homeostasis and response
LESSON 1

2. LO Question: What do we mean by homeostasis?
Learning outcomes
All pupils will be able to (Baseline): Name some human internal conditions that are controlled. Show the pathway of a control system as receptor, coordination centre, effector.
Most pupils will be able to (Further): Define homeostasis. Explain why internal conditions need to be maintained. Identify stimuli, receptors, coordination centres, and effectors in examples of nervous and chemical responses.
Some pupils will be able to (Challenge): Apply knowledge of enzymes and osmosis to explain in detail why internal conditions need to be maintained. Explain how drugs affect homeostasis. Explain how nervous and chemical responses differ.
Students in this class
Aiming for 4
Aiming for 6
Aiming for 8

4. Exam question
image

5. Exam question

6. Exam question

7. Markscheme
M 1.(a)     (i)      kidney
(ii)     bladder
(iii)    liver
(iv)    lung(s)
(v)    skin
(b)     (i)      3000
allow 2970 to 3030
correct answer gains 2 marks with or without working 2
if answer incorrect allow 1 mark for evidence of (allow tolerance of + or – ½ square on each)
(ii)     1600 allow 1570 to
(iii)    1400 allow (b)(i) – (b)(ii) 1
(iv)    correct plot from (b)(iii)
tolerance ½ square ignore width
(v)     cells swell / overhydrated / damaged accept poisoned (by urea) 1
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