Nervous System Flashcards

1
Q

What is homeostasis?

A

Homeostasis is the maintenance of a constant internal environment.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Example of homeostasis

A

Examples include blood glucose, water levels and body temperature.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What do all control systems have?

A

Receptors
Coordination centres
Effectors

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is a Receptor

A

cells that detect stimuli

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is a coordination centre?

A

process information given by the receptors

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Example of a coordination centre

A

Brain
Spinal cord
Pancreas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is an effector?

A

bring about responses to bring the conditions in the body back to optimum levels

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Example of an effector

A

Muscles
Glands

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How does the nervous system help us react and coordinate actions in response to stimuli?

A

1. Receptor cells convert stimulus in to an electrical impulse
2. Electrical impulse travels along sensory neurons to the CNS
3.Information is processed
4.Appropriate response is coordinated and electrical impulse is sent along the motor neurons to the effector
5. Effectors carry out response

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

CNS

A

Central Nervous System

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Why are reflex actions different to usual stimuli?

A

The reflex arc skips out the conscious part of your brain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Example of a reflex

A

Sharp stimuli
Burning stimuli

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Describe the reflex arc

A

1. Stimulus detected by receptors
2. Impulses are sent along a sensory neuron
3. In the CNS the impulse passes to a relay neuron
4. Impulses are sent along a motor neuron

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Neurons

A

specialised cells that conduct electrical impulses through the body

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Nerve

A

bundle of many nerve fibres enclosed within a protective sheath

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Nerve fibres

A

long axons of neurons together with any associated tissues

17
Q

Stimulus

A

Change in environment that prompts receptors

18
Q

What is the function of the nervous system?

A

Make quick short term reactions to environment and coordinate behaviour

19
Q

What is in the peripheral nervous system?

A

Neurons bundled in to nerves

20
Q

Parts of CNS

A

Brain
Spinal cord

21
Q

What is a synapse?

A

Gaps between two neurons

22
Q

How many synapses does the human body have?

A

500 Trillion

23
Q

Describe how a synapse completes its function

A

1. When impulse reaches the end of the first neuron a chemical is released in to the synapse
2. Chemical diffuses across the synapse
3. When the chemical reaches the second neuron it triggers the impulse to begin again in the next neuron

24
Q

What is reaction time?

A

How long it takes you to respond to a stimulus

25
Q

How can reaction time be measured?

A

Drop ruler test

26
Q

Give the pathway of a nervous response

A

stimulus
receptor
coordinator
effector
response