Survival of an organism depends on its ability to respond to changes in the environment. The nervous system allows fast acting but short lived responses.
What is a stimulus?
A change in the environment that is detected by effectors
A change in the environment that is detected by receptors
A response to a change in the environment
What are the three types of neuron?
Sensory, spinal cord, motor
Sensory, replay, motor
Sensory, relay, motor
Which is the correct order of neurons in a reflex arc?
Sensory neuron, motor neuron, relay neuron
Relay neuron, sensory neuron, motor neuron
Sensory neuron, relay neuron, motor neuron
Which of these structures is part of a neuron?
What is released at a synapse?
What is the function of the fatty myelin sheath around axons?
It helps to slow down nerve impulses
It allows nerve impulses to travel from one neuron to the next
It speeds up nerve impulses
What is a reaction time?
How long it takes for a stimulus to occur after a response
How long it takes for an effector to detect a stimulus
How long it takes for a response to occur after a stimulus
What are effectors?
Muscles and glands
Muscles and nerves
What organ does a reflex arc miss out originally?
How do neurotransmitters move across a synapse?