Stimuli and Responses- Nervous Communication Flashcards
How do animals increase their chances of survival?
By responding to changes in their external environment
Why do animals also respond to changes in their internal environment?
To make sure that the conditions are always optimal for their metabolism
What is a stimulus?
Any change in the internal or external environment
How do plants increase their chances of survival?
By responding to changes in their environment
What is the role of receptors?
To detect stimuli
What are effectors?
Muscles or glands that bring about a response to a stimulus
What are the 3 main types of neurones?
Sensory, motor and relay
What is the role of sensory neurones?
Transmit electrical impulses from receptors to the central nervous system
What is the role of motor neurones?
Transmit electrical impulses from the CNS to effectors
What is the role of relay neurones?
Transmit electrical impulses between sensory neurones and motor neurones
What happens once a stimulus is detected by a receptor?
An electrical impulse is sent along a sensory neurone
What happens when an electrical impulse reaches the end of a neurone?
Chemicals called neurotransmitters take the information across to the next neurone
What does the coordinator do?
Processes the information and sends impulses along motor neurones to an effector
What is the central nervous system made up of?
The brain and spinal cord
What is the peripheral nervous system?
Made up of neurones that connect the CNS to the rest of the body
