B5 The Nervous system

The environmental change that the body detects is know as the

• Stimulus

• Response

• Impulse

• Reaction

What detects stimuli inside and outside our bodies?

• Organs

• Receptors

• Effectors

• Neurons

Which of these is NOT an example of a sense organ?

• Eye

• Ear

• Stomach

• Skin

Effectors carry out a ...?

• Stimulus

• Impulse

• Response

The brain and spinal cord make up the ...?

• Central nervous system

• Peripheral nervous system

Which of the following do NOT have a brain?

• Sponge

• Flatworm

• Fly

• Jellyfish

What is this a picture of?

• A motor neuron

• A brain cell

• A relay neuron

Neurons have axons that are insulated by a fatty sheath. What does the fatty sheath do?

• Protects the fragile cell

• Provides energy for the cell

• Keeps the cell warm

• Increase the speed that impulses travel

What type of neurons carry impulses from the CNS to effectors?

• Sensory

• Motor

What is the gap between neurons known as?

• An impulse

• A reaction

• A synapse

• A relay neuron