Topic 2:The Nervous System Flashcards
1
Q
What is a stimulus?
A
-anything your body is sensitive too
2
Q
What do all sense organs have?
A
-contain receptor cells
3
Q
Explain how a response is carried out?
A
- receptor cells produce impulse
- travels to the brain
- brain processes the information and send impulses to other parts of the body producing a response
4
Q
What is a neurotransmission and where does it happens?
A
- travelling or transmission of impulses
- happens in neurones
5
Q
What do neurones have?
A
- cell body
- long extensions to carry out impulses
6
Q
What is the function of a sensory neurone?
A
-carries impulses from receptor cells towards the CNS
7
Q
How does a receptor cell pass an impulse?
A
- passes into a dendrite
- then transmitted along the dendron and then the axon
- a series of axon terminals allows impulse to be transmitted into other neurones
8
Q
Why are dendrons and axons long?
A
-fast neurotransmission over long distances
9
Q
What does a myelin sheath do?
A
- electrically insulates a neurone from neighbouring neurones stopping the signal losing energy
- makes an impulse jump along the cell between the gaps in the myelin so it speeds up neurotransmission
