What type of cells start electrical impulses along nerves?
Receptor
Effector
Motor neurones
What part of a nerve cell insulates the electrical signal?
Axon
Myelin sheath
Dendron
What is the gap between nerve cells called?
Neurotransmitter
Synapse
What neurones carry signals to effectors?
Motor
Relay
Sensory
Where do electrical signals go in a reflex arc?
The spinal cord
Cerebral hemispheres
Cerebellum
What effect do stimulants like caffeine have on your reaction times?
No effect
Increase them
Decrease them
What part of the brain controls balance and coordination of movement?
Medulla
Hypothalamus
What is the function of the cornea?
Contains the receptors
Controls how much light enters the eye
Refracts light
What shape is the lens in an eye if a person is looking at a near object?
Short and fat
Long and thin
Short and thin
Which of these detects gamma rays? - Higher
MRI
PET
CT