The Nervous System Flashcards
What is a stimulus?
A change in your environment to which you may need to react
What is a receptor?
Groups of cells which are sensitive to a stimulus
What are the sense organs?
Eyes Ears Nose Tongue Skin
What receptor does the eye hold?
Light receptors - sensitive to light
What receptor does the ear hold?
Sensitive to sound and balance
What receptor does the nose hold?
Smell receptors- sensitive to chemical stimuli
What receptors does the tongue hold
Taste receptors
What receptor does the skin hold?
Sensitive to touch, pressure, pain and temperature change
What is the central nervous system?
Consists of the brain and the spinal chord and is where all the information from sense organs are sent and where reflexes and actions are coordinated
What are neurones?
Nerve cells that transmit information as electrical impulses Quickly to and from the nervous system
What does the nervous system do with the information?
Sends it to the effectors (muscles and glands) which then respond
What is a synapse?
The connection between two neurones
The nerve signal is transferred between chemicals which diffuse across the gap
Chemicals set off new electrical signals in to next neurone
What are reflexes?
Automatic responses to certain stimuli which can reduce your chance of being injured
What is a reflex arc?
The passage of information in a reflex (from receptor to effector)
What is the sensory neurone?
The nerve cell that carries signals as electrical impulses to the nervous system
