The brain and the spinal cord form which system in the body?
The peripheral nervous system
The central nervous system
The reflex nervous system
What is different about the way an impulse is transmitted along neurones compared to across a synapse?
Synapses transmit electrical impulses but neurones transmit chemical messages
Neurones transmit impulses but a synapse does not
Neurones transmit electrical impulses but synapses transmit chemical messages
Which of these is a stimulus?
Eye
Light
Neurone
Which of these is an effector?
Spinal cord
Muscle
Brain
The withdrawal reflex is an automatic and rapid response to a stimulus. Which other word describes a reflex?
Slow
Protective
Constant
The pupil reflex is a protective reflex of the eye. Which statement about this reflex is true?
The pupil dilates to protect from strong light
The pupils dilate to protect from low light
The pupil contracts to protect from strong light
Which structure of the eye alters the diameter of the pupil?
Cornea
Iris
Lens
Which structure of the eye contains the light sensitive cells (receptor cells)?
Retina
Optic nerve
Sclera
Which structure of the eye is a pigmented layer with many blood vessels?
Choroid
Blind spot
Pupil
Which neurone takes messages from the sense organ to the central nervous system?
Motor neurone
Relay neurone
Sensory neurone