BTEC Unit 1 Quiz 3

How are nerve cells specialized for their function?

• They have a rigid structure

• They are flexible and can change shape

• They have long extensions for transmitting signals

• They are small and compact

What is a synapse?

• A type of muscle

• A gap between nerve cells

• A part of the digestive system

• A type of bone

What is the function of the relay neurone?

• To carry electrical impulses from the receptor to the CNS

• To connect sensory and motor neurones

• To carry electrical impulses from the CNS to the effector

• To detect stimuli

In a reflex arc, what is the role of the receptor?

• To carry impulses to the CNS

• To detect stimuli

• To connect neurones

• To secrete hormones

Which part of the reflex arc is responsible for detecting changes in the environment?

• Effector

• Receptor

• CNS

• Motor neurone

What is the sequence of neurones in a typical reflex arc?

• Motor, relay, sensory

• Sensory, relay, motor

• Relay, sensory, motor

• Sensory, motor, relay

What is an agonist?

• A neurotransmitter that helps with body movements

• A chemical that mimics the action of neurotransmitters

• A neurotransmitter involved in mood regulation

• A precursor to dopamine

Where is serotonin produced?

• In the liver

• In the heart

• In certain neurons in the brain

• In the kidneys

Why can an impulse only travel in one direction across a synapse?

• Because of the presence of receptors only on one side

• Because of the shape of the synapse

• Because of the electrical charge

• Because of the temperature

What is the role of neurotransmitters in the nervous system?

• To transmit signals across synapses

• To store genetic information

• To provide structural support

• To produce energy