Paper 2 topics

Question 1

what is the definition of homeostasis?

Answer 1

the regulation of internal conditions of a cell or organism in response to internal and external changes

Question 2

what do automatic control systems do?

Answer 2

they make sure the internal conditions stay as constant as possible

Question 3

what do receptor cells do?

Answer 3

detect changes in the environment (aka a stimulus)

Question 4

what does the co-ordination centre do?

Answer 4

receives and processes the information from the receptor cells

Question 5

what are examples of co-ordination centres?

Answer 5

• brain
• spinal cord
• pancreas

Question 6

what does the effector do?

Answer 6

carries out the response using the instructions sent in from the co-ordination centre

Question 7

what are effectors?

Answer 7

muscles or glands

Question 8

what is the basic automatic control system?

Answer 8

receptor cells => co-ordination centre => effector => response => stimulus

Question 9

what is the basic automatic system?

Answer 9

receptor cells => co-ordination centre => effector => response => stimulus