Maciej Nervous system Maciej Flashcards

(10 cards)

1
Q

Define Homeostasis

A

The regulation of the internal conditions of a cell or organism to maintain optimum conditions for function in response to internal and external changes

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2
Q

What three conditions does the body need to maintain at a constant level ?

A

Water levels, blood-glucose concentration, temperature

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3
Q

In the bodies response system, what are the receptors ?

A

Receptors are parts of the body that detect changes in the environment (a stimulus)

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4
Q

In the bodies response system what are the co-ordination centres ?

A

Parts of the body which process the information from the receptors e.g. (brain, spinal cord, pancreas)

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5
Q

In the bodies response system, what is the effector ?

A

The part of the body that initiates a response based on the change

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6
Q

Describe the pathway of a nervous system response

A
  • A stimulus is detected by a receptor
  • An electrical impulse is sent via the sensory neurone to the central nervous system (brain or spinal cord)
  • The central nervous system sends an electrical impulse via the motor neurone to the effector
  • The effector issues a response
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7
Q

Why is there a gap between neurones and what is it called ?

A
  • The tiny gap is called a synapse

- The synapse makes sure that the electrical impulse travels in only one direction

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8
Q

What are reflex actions ?

A

Reflex actions are fast automatic responses, they do not initially involve the brain but rather the spinal cord

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9
Q

What is the pathway of an electrical impulse during a reflex action called ?

A

Reflex arc

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10
Q

Describe the pathway if a reflex arc

A
  • Stimulus is detected by receptor and sends an impulse
  • The impulse travels via the sensory neurone to the central nervous system (Spinal Cord)
  • Electrical impulse sent over Relay neurone then to the motor neurone which travels to the effector which issues a response
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