Yr 11 B5.4 Reflex Actions Quiz

What is the primary purpose of reflexes in the human body?

• To control voluntary muscle movements

• To protect the body by providing quick, automatic responses

• To help the brain process complex thoughts

Which of the following correctly describes a reflex?

• A slow, conscious reaction to external stimuli

• A rapid, automatic response that involves the conscious part of the brain

• A fast response that bypasses the conscious brain

Which of the following is not a type of neurone involved in a simple reflex arc?

• Relay neurone

• Sensory neurone

• Intercalated neurone

Why are reflexes important for survival?

• They allow you to think before reacting to danger

• They prevent damage by producing fast responses without conscious thought

• They control all movements of the digestive system

Where is the relay neurone usually located in a reflex arc?

• In the brainstem

• In the spinal cord

• In the muscles near the site of stimulus

What happens at a synapse when an electrical impulse reaches it?

• The impulse is stored temporarily until needed

• Neurotransmitter molecules are released to carry the signal across the gap

• The impulse directly jumps to the next neurone

Which of the following best explains why synapses slow down signal transmission slightly?

• Electrical impulses are absorbed by the receptor site

• Transmitter molecules must diffuse across the synapse

• The receptor site delays the signal until consciously approved

What is the correct order of structures involved in a reflex arc?

• Stimulus → receptor → motor neurone → sensory neurone → effector

• Stimulus → sensory neurone → relay neurone → motor neurone → effector

• Stimulus → effector → motor neurone → sensory neurone → brain

Which statement best describes how reflex actions differ from voluntary actions?

• Reflex actions are always slower than voluntary actions

• Reflex actions require conscious thought, while voluntary actions don’t

• Reflex actions are automatic and bypass the conscious brain

When the effector organ receives the impulse in a reflex arc, what does it do?

• It sends a signal back to the spinal cord to confirm the reflex

• It is stimulated to produce a response such as muscle contraction

• It delays its response until the brain has analyzed the signal