Homeostasis Flashcards

1
Q

What must the body keep control of ??

A

Water levels
Blood glucose concentration
Body temperature

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2
Q

What do all control systems contain???

A
  • receptors
  • co ordination centre
  • effectors
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3
Q

What does the receptor do, and how an example.

A
Detect stimuli (changes in environment)
-skin
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4
Q

What does the co ordination centre do, and give an example.

A

The brain or the spinal cord or pancreas

-receive and process information from the receptors

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5
Q

What does the effectors do, and give an example.

A

Muscle or gland

- bring about a response and restore optimum levels

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6
Q

What is the order of the nervous systems response?

A

Stimuli-receptor-CNS-effector-response

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7
Q

Why is homeostasis important ?

A

Enzymes need the right conditions to function properly

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8
Q

What is a sensory neurone?

A

The neurones that carry information as electrical impulses from the receptors to the CNS

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9
Q

What is a motor neurone?

A

The neurones thus carry electrical impulses from the CNS to effectors

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10
Q

What are effectors?

A

All your muscles and glands, which respond to nervous impulses

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11
Q

What do receptors do??

A

Detect stimuli

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12
Q

What do effectors do?

A

Bing about change

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13
Q

What is the connection between two neurones called ? And how does it work?

A

When the electoral impulses reach the end of a neurone it stimulates the release of a chemical. chemicals diffuse across the synapse to activate the chemical in the next neurone

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14
Q

What is homeostasis?

A

The maintenance of a stable environment in response to changes both internal and external conditions

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15
Q

What neurones are in a reflex arc?

A
  • sensory neurone
  • relay neurone
  • motor neurone
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16
Q

What is a reflex arc ?

A

The passage of information in a reflex from receptor to effector

17
Q

What are the differences between the nervous system and reflexes ?

A
  • reflexes bypass the conscious part of the brain
  • responses use either the brain or spinal cord
  • reflexes are fast and prevent injury
18
Q

Why are reflexes quicker ?

A

You don’t have to think about the response

19
Q

What is the name given to the connection between two neurones

20
Q

What factors effect human reaction time ?

A
  • drugs
  • caffeine
  • age
  • gender
21
Q

What is reaction time?

A

The time it takes to respond to a stimulus

22
Q

Give the control variables when investigatin reaction time

A
  • same person
  • same hand
  • same height
23
Q

Why is using a computer rather than a ruler more precise?

A

Removes human error

24
Q

Why is using a computer rather than a ruler more accurate?

A
  • It records it in milliseconds

* removes possibility that the person can detect when the ruler is dropped

25
What does he nervous system allow humans to do?
React to their surroundings and co ordinate their behaviour
26
How is information passed around the body?
As electrical impulses
27
What is a stimulus ?
A change in the environment