Homeostasis

Question 1

What is homeostasis

Answer 1

The regulation of the conditions inside your body to maintain a stable internal environment, in response to changes in both internal and external conditions

Question 2

Why is homeostasis important

Answer 2

Because the conditions in our body need to be kept steady since our cells need the right conditions in order to function properly, including right conditions for enzyme action

Question 3

What do receptors do

Answer 3

Detect a stimulus

Question 4

What does the coordinarion centre do

Answer 4

Recieve and process the information, then organise a response

Question 5

What do effectors do

Answer 5

Produce a response, which counteracts the change and restores the optimum level

Question 6

What does the Nervous system consist of

Answer 6

Central Nervous System (CNS)
Sensory Neurons
Motor Neurons
Effectors

Question 7

What do sensory neurons do

Answer 7

Carry information as electrical impulses from receptors to CNS

Question 8

What do motor neurones do

Answer 8

Carry electrical impulses from CNS to effectors

Question 9

What is the synapses and what happens there

Answer 9

A connection between two neurones. There nerve signal is transferred by chemicals which diffuse across the gap

Question 10

Reflexes

Answer 10

Rapid, automatic responses to certain stimuli that don’t involve the conscious part of the brain

Question 11

What does the relay neurone do

Answer 11

It carries the electrical pulse through the co-ordination centre as is picks up the pulse from the sensory neurone and passes it to the motor neurone

Question 12

Ruler drop test

Answer 12

1. Hold a ruler vertically between the thumb and index finger of the person tested and have their arm resting on the side of a table to avoid movement during the test. Make sure the zero end is level with their thumb
2. Let go without warning and the person tested should catch it as fast as they can, reaction time is measured by the number on the ruler from where it is caught. The larger the number the slower the rt.
3. Repeat 5 times and calculate a mean.
4. Give them a caffeinated drink and wait 10minutes before repeating steps 1-3
5. Control variables, use the same person, use the same hand, dropped from the same height, didn’t have caffeine before the experiment