The Nervous System Flashcards
What are the five different sense organs?
Eyes, ears, nose, tongue and skin
What’s a receptor? Give an example?
Receptors are groups of cells which are sensitive to a stimulus. They change stimulus energy e.g. light energy into electrical impulses.
Name 8 stimuluses…
Light, sound, touch, pressure, pain, chemical, or a change in position or temperature.
Explain the central nervous system…
The CNS is where all the information from sense organs is sent, and where reflexes and actions are coordinated.
What does the CNS consist of?
The brain and the spinal chord only.
What are neurones?
Nerve cells
Explain what neurones do…
Neurones transmit the information as electrical impulses very quickly to and from the CNS.
What is sent from the central nervous system?
Instructions from the CNS are sent to the effectors (muscles and glands), which respond accordingly.
What is a stimulus?
A stimulus is a change in your environment
Eyes what receptors do they have?
Light receptors - sensitive to light. These cells have a nucleus, cytoplasm and a cell membrane.
Ears what receptors do they have?
Sound receptors - sensitive to sound. Also, balance receptors - sensitive to changes in position.
Noes what receptors do they have?
Smell receptors - sensitive to chemical stimuli.
Tongue what receptors do they have?
Taste receptors - sensitive to bitter, salt, sweet and sour, plus the taste of savoury thinks like monosodium glutamate (MSG) - chemical stimuli.
Skin what receptors do they have?
Sensitive to touch, pressure, pain and temperature change.
What is a sensory neurone?
The nerve cells that carry signals as electrical impulses from the receptors in the sense organs to the central nervous system.
