Co-ordination & response in Humans

Question 1

Sensitivity

Answer 1

The ability to recognise and respond to changes in the environment

Question 2

Stimulus

Answer 2

A change in conditions

Question 3

receptor

Answer 3

recognises the stimulus

Question 4

effector

Answer 4

carries out the response

eg muscle or gland

Question 5

Homeostasis

Answer 5

the maintenance of a constant environment

Question 6

neurones

Answer 6

nerves made up of specialised cells

Question 7

sensory neurons

Answer 7

Neurones that link sense organs to the central nervous system

Question 8

relay neurons

Answer 8

Neurones within the central nervous system which may be very short

Question 9

motor neurones

Answer 9

neurones that connect the central nervous system to an effector

Question 10

Synapse

Answer 10

a very small gap between the ends of two neurones

Question 11

reflexes

Answer 11

Rapid, automatic responses to specific stimulus that protect you in some way

eg- blinking if you get something in your eye
- sneezing if you breathe in dust

Question 12

Temperature of the human body

Answer 12

37 degrees

Question 13

If core temperatures rise to far…

Answer 13

• sweat is released from sweat glands and evaporates
• blood vessels carrying blood near the surface of the skin dilate (get wider) so more blood flow through them = VASODILATION

Question 14

If core temperatures fall too far…

Answer 14

• no sweat released
• blood vessels carrying blood near the surface of skin constrict ( get narrower) reducing amount of blood flowing through them = VASOCONSTRICTION

Question 15

Adrenaline

Answer 15

prepares body for fight or flight

Question 16

Insulin

Answer 16

helps to control blood glucose concentration

Question 17

Testosterone

Answer 17

male sex hormone

Question 18

progesterone and oestrogen

Answer 18

female sex hormone