Reflexes

Question 0

Reflexes are automatic to certain …?

Answer 0

Stimuli-they can reduce the chances of being injured.

Question 1

Why do we have reflexes?

Answer 1

Because sometimes our brain is too slow.

Question 2

If someone shines a bright light into your eye, what happens?

Answer 2

Your pupils automatically get smaller.

Question 3

What is the human reflex when you gets shock?

Answer 3

Your body releases the hormone adrenalin automatically.

Question 4

What is the route called which is taken by the information?

Answer 4

Reflex arc.

Question 5

The reflex arc goes through which system?

Answer 5

Central nervous system.

Question 6

Where do the neurones in reflex arcs go through? (2)

Answer 6

The spinal chord or through an unconscious part of the brain.

Question 7

Give an example of a stimulus…

Answer 7

A fire (hot object).

Question 8

What happens when a stimulus is detected by receptors?

Answer 8

An impulse is sent along a sensory neurone to the CNS.

Question 9

In the CNS the sensory neurone passes on the message to another type of neurone called…?

Answer 9

A relay neurone

Question 10

What is the gap called between two neurones?

Answer 10

a Synapse.

Question 11

How do messages pass across synapses?

Answer 11

Chemicals.

Question 12

What are the names of the chemicals which pass messages between the synapses in the brain?

Answer 12

Neurotransmitters

Question 13

Suggest why it’s important for animals to be able to detect changes in their external environent

Answer 13

So they can respond to the changes in order to avoid danger/increase their chances of survival

Question 14

Cells in the sense organs detect stimuli. What name is given to these cells?

Answer 14

Receptor cells

Question 15

Name the stimulus, sense organ and effectors when a hungry animal see a source of food and it moves towards it?

Answer 15

Stimulus: meat (food)
Sense organ: eye
Effectors: muscle cells

Question 16

The nervous system coordinates responses to stimuli. Name the other other communication system in the body that coordinates responses to stimuli?

Answer 16

Hormonal system

Question 17

Two parts of the body which make up the central nervous system…

Answer 17

• brain

- spinal cord

Question 18

Why type of neurone carries information from the sense organs to the central nervous system?

Answer 18

Sensory neurones

Question 19

Why can the central nervous system produce very rapid responses to stimuli?

Answer 19

Information is transmitted using high speed electrical impulses.

Question 20

What do you do to make a test fair?

Answer 20

Replicates

Question 21

Why is a reflex reaction faster than a voluntary reaction?

Answer 21

It happens without time being spent thinking about a response.

Question 22

Why are reflex reactions useful?

Answer 22

No time is wasted and you can quickly move out the way of danger.

Question 23

What is the name given to the small gap between neurones?

Answer 23

Synapse

Question 24

If someone picked up a hot plate then dropped it because it was hot, what would be the effectors?

Answer 24

The muscle contracting and letting go if the plate.

Question 25

What is the function of the iris?

Answer 25

To control the diameter of the pupil.

Question 26

Name two types of light receptor found on the retina…

Answer 26

Rods and cones

Question 27

Name the part of the retina that has the greatest number of colour sensitive light receptors….

Answer 27

Fovea

Question 28

Describe (briefly) how info about light entering the eye is passed to the brain…

Answer 28

Optic nerves carry impulses from the receptors to the brain.

Question 29

What do synapses do?

Answer 29

Slow down the response between the two neurones.

Question 30

What is the job of the CNS? (Central nervous system)

Answer 30

COORDINATE the response

Question 31

When receptors in a sense organ detects a stimulus what do they do?

Answer 31

They send electrical I mules to an effector along a motor neurone.