Human nervous system Flashcards
1
Q
Nerve cells properties
A
- long
- thin
- branched connections
2
Q
Synapse
A
- connection between two neurons
- Chemicals diffuse across to the next
neurone to trigger an electrical
impulse
3
Q
Central nervous system
A
- contains the brain and spinal cords
- connected to the body by sensory and
motor neurones
4
Q
Sensory neurones
A
Carries information as electrical impulses from receptors to CNS
5
Q
Motor neurones
A
Carries electrical impulses from CNS to effectors
6
Q
Benefits of relex arcs
A
- rapid
- automatic
avoid getting hurt
7
Q
Nervous system in order
A
- stimulus
- receptors
- sensory neurones
- CNS
- motor neurones
- effectors
- response
8
Q
Reflex arc in order
A
- stimulus
- receptors
- senory neurones
- relay neurones
- motor neurone
- effector
9
Q
Parts of the brain
A
- cerebal cortex
- cerebellum
- medulla
- hypothalamus
10
Q
3 main reasons why treating the brain is difficult
A
- hard to access due to skull
- fragile
- brain is complicated so hard to target
with medications - many things can go wrong from
mental illness to infections
11
Q
How is the cornea adapted
A
- transparent
- no blood vessel
12
Q
Cornea purpose
A
to refract the light
13
Q
iris purpose
A
controls how much light can pass through to the lens
14
Q
lens purpose
A
refract light by changing its shape so light reaches the retina
15
Q
What are the functions of the 2 receptor cell in the retina
A
Cone cells - helps see colour in light
rod cells - more sensitive to light but
only allows us to see in black
and white
