Sensitivity Flashcards
What are the three key reasons why we have a nervous system
1) to protect ourself from danger
2) to find food and water
3) To find a mate and reproduce so that we can carry on the species
Why do many animals have a nervous system
So that they can sense what is happening in the world around them and react to that information if necessary
What happens if there is a break in the spinal cord
Paralysis below that point
Nerve impulses
Nerve impulses can only be carried in one direction, so we need to have different type of nerve cells to connect up in different part of out body
What are the three types of nerve cells that carry impulse around our body called
1) sensory neurone
2) motor neurone
3) linking neurone
What does sensory neurone, motor neurone and linking neurone do
Sensory neurone- pass impulses from the receptor In a sense organ like the ear to the CNS
Motor neurone-pass impulses from the CNS to ab effector like a muscle
Linking neurone-connects one nerve cell with another within the CNS
Why is our brain important
The brain interprets information very well, the fist time you do something new and it is quite difficult the next time you do it the brain understands it and It is much easier
Eye- Ear- Tough- Nose- Skin-
Sense: Sight Hearing Taste Smell/ taste Touch, temperature, pain
Stimulus: Light Air molecules vibrating Chemicals in food Air-borne gasses Mechanical pressure, hot/ cold
What are the three tiny bones in your ear called
Hammer
Anvil
Stirrup
What helps you keep balance
Semi-circular canals
What is the long tube called leading into the middle ear
Ear canal
Ear flap
Collects sound
Ear drum
Vibrates and transmits sound to the middle ear
Tiny ear bones
Amplify the sound and transmit it to the inner ear
Changes sound vibration into nerve impulses
Cochlea
