Communication and homeostasis

each person in group research one set of words e.g. text p 4, 5, 6, 7 – then share your ideas

1) homeostasis, positive feedback and negative feedback

2) stimulus, response, internal and external environment

3) sensory receptor, effector cells and cell signalling

Homeostasis

Ectotherms and endotherms - text p8 - 11

why do animals need to control body temperature?

Ectotherms and endotherms – can you describe and explain the graphs?

Keeping the core temperature constant in endotherms – peripheral

parts vary

body temperature in warm and cold environments

thermograms

Controlling body temperature • Why is it important for animals to maintain their

core body temperature within certain limits?

• Are these animals ectotherms or endotherms? mammals insects reptilesbirds amphibians spiders

• State one advantage and one disadvantage of being an ectotherm rather than an endotherm; include the meaning of the two words

• Describe one behavioural and one physiological adaptation of locusts which help them to regulate their body temperature

Make a summary chart / poster / diagram to show how your body maintains a constant core body

temperatureas an endotherm

(include physiological and behavioural responses) Make sure you include:-

• peripheral temperature receptors• the hypothalamus

• effectors in skin, muscles and liver• behaviour

Understanding skin structure

Changes in blood flow through skin so more heat is lost by conduction, convection, radiation and evaporation of

sweat

Compare the food requirements of the 2 mammals per gram of body mass. Why are they different? (P11 text)

Penguins in Australia and the Antarctic – explain if the fairy penguins would survive in

the cold

Emperor penguins huddling – how does this help thermoregulation?