Biology Paper 2-The Nervous system
What does the nervous system do?
Detects and reacts to stimuli
What does the nervous system mean for humans?
It means that humans can react to their surroundings and coordinate their behaviour
What is the nervous system made up of?
-Central nervous system
-Receptors
-Sensory Neurones
-Effectors
-Motor Neurones
What does the central nervous system consist of?
The brain and spinal cord
What is the central nervous system connected to the body by?
Sensory neurones and motor neurones
What do the receptors do?
Receptors are the cells that detect stimulus
Different receptors detect different stimulus. Give an example of this.
Receptors in the ears detect sound
What do the sensory neurones do?
They carry information as electrical impulses from the receptors to the central nervous system
What do the effectors do?
Effectors respond to electrical impulses and bring out a change
What parts of the body are effectors?
Muscles and glands
How do muscles respond?
Muscles contract
How do glands respond?
Glands release hormones
What do the motor neurones do?
They carry electrical impulses from the central nervous system to the effectors
What does the central nervous system do?
It recieves information from the receptors and then coordinates a response
How does the nervous system work?
-The receptors detect a stimulus.
-Sensory neurones carry the information from the receptors to the central nervous system.
-The central nervous system then coordinates a response.
-The central nervous system sends information to the effectors along the motor neurones.
-The effectors then respond.