5.7 Senses and impulses

BS 5.7 
Senses and impulses
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BS 5.7 
Senses and impulses

Slide 1 - Tekstslide

Sensing things
What happens over here?

Slide 2 - Tekstslide

Sensing things
You see and smell chocolate
Using sense organs
Signal (impulse) through nerves to your brain
Brain send impulse to arm muscle -> you grab the chocolate

Slide 3 - Tekstslide

Sensory cells
Sensory organs have sensory cells
Which are connected to nerves

When the sensory cells receive a stimulus they generate an impulse (kind of electrical signal)

Slide 4 - Tekstslide

How an impulse starts
1. Stimulus needs to be strong enough -> threshold value
= the lowest intensity of stimulus that causes an impulse
2. Impulse frequency - a stimulus gets stronger, more impulse per second

Slide 5 - Tekstslide

Adequate stimuli
A stimulus that sensory cells are particularly sensitive to, a sensory cell has a low threshold value for this stimulus 

Example: Sensory cells in your eyes respond to light
Light is the adequate stimulus

Slide 6 - Tekstslide

Slide 7 - Tekstslide

3 types of nerve cells
1. Sensory neurons: pass the impulses from the sense organs to the CNS
2. Motor neurons: pass impulses from the CNS to the muscle/glands
3. Interneurons: conduct impulses within the CNS

Slide 8 - Tekstslide

Slide 9 - Video

Get to work
Read BS 5.7
Make assignment 1, 2, 3, 4 and 6

Slide 10 - Tekstslide