Homeostasis And Response

Question 1

What’s homeostasis

Answer 1

Processes in a cell organism to keep conditions optimal

Question 2

What are control systems made up of

Answer 2

Receptor cells which detect change in environment

Effectors (muscles or glands) which carry out response to stimuli

Coordination centres that receive and process information

Question 3

What’s a synapse

Answer 3

Found at the end of a reflex arc
Pass information from one neurone to another

Electrical impulse reaches end of the synapse. This triggers the release of neurotransmitters
They diffuse across the synapse
They bind to the receptor on the next neurone

Question 4

Reflex actions

Answer 4

Allow a rapid automatic response
Travels along reflex arc
Senory neurone to CNS
Relay neurone to motor neurone

Question 5

The brain

Answer 5

Medulla is unconscious activities
Cerebral cortex is unconscious thoughts
Cerebellum is muscle coordination

Question 6

What does homeostasis control

Answer 6

Blood glucose conc
Body temp
Water levels

Question 7

Describe vasodilation

Answer 7

The thermoregulatory system detects a change
Body temp is too high
Blood vessels dilate
Sweat from sweat glands
Energy goes from skin to environment so body temp falls

Question 8

Vasoconstriction

Answer 8

Thermeoregulatory system detects a change
Body temp is low
Blood vessels constrict
Sweating stops and muscles contract (shivering)
Body temp rises