The Nervous System
- Created by: puntm003
- Created on: 16-02-14 11:55
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- Nervous System
- Sense Organs
- Eyes
- Contains light receptors
- Nucleus
- Cytoplasm
- Cell Membrane
- Sensitive to light
- Contains light receptors
- Ears
- Sound receptors
- Sensitive to sound
- Sensitive to changes in position
- Sound receptors
- Nose
- Smell receptors
- Sensitive to chemical stimuli
- Smell receptors
- Tounge
- Taste receptors
- Sensitive to bitter,salt,sweet and sour (chemical stimuli)
- Taste receptors
- Skin
- Sensitive to touch, pressure, pain and temperature change
- Eyes
- Neurons and Effectors
- Sensory neurons
- Carry signals as electrical impulses
- Travel from the receptors in the sense organs to the Central Nervous System (CNS)
- Relay neurons
- Carry signals from sensory neurons to motor neurons
- Motor Neurons
- Carry signals from CNS tor the effector muscles or glands
- Effectors
- Muscles and glands
- Muscles contract in responce
- Glands secrete hormones
- Sensory neurons
- Synapses
- The connection between two neurons
- The nerve signal is transferred by chemicals which diffuse (move) across the gap
- These chemicals set off a new electrical signal in the next neuron
- Reflex Arc
- Stimulus
- Sensory neurone
- Relay Neurone
- Motor neurone
- Efffector
- Responce
- Receptor
- Hormones vs. Nerves
- Hormones
- SLOWER message
- Act for a LONG time
- Act in a more GENERAL way
- Nerves
- Very FAST message
- Act for a very SHORT time
- Act on a very PRECISE area
- Hormones
- Sense Organs
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