Reflex Actions

What is the pathway of a reflex arc?

• CNS to receptor to effector

• Receptor to CNS to effector

• Effector to CNS to receptor

• CNS to effector to receptor

What is a reflex action?

• A slow, voluntary response

• A rapid, automatic response

• A conscious decision

• A learned behavior

What is the role of motor neurons in a reflex arc?

• To detect stimuli

• To send impulses to muscles

• To process information in the brain

• To connect with sensory neurons

What is the function of relay neurons (interneurons) in a reflex arc?

• To detect external stimuli

• To receive impulss from sensory neurones and pass them on to motor neurones

• To transmit signals to the brain

• To send impulses directly to muscles

What is the gap between two nerve cells called?

• Synapse

• Axon

• Dendrite

• Neuron

What is the function of neurotransmitters at a synapse?

• To block nerve impulses

• To transmit signals across the gap

• To insulate the axon

• To store energy

What is the role of the ventral root in the spinal cord?

• To receive sensory information

• To send motor impulses

• To process visual data

• To regulate blood flow

What is the term for the middle part of the spinal cord?

• White matter

• Grey matter

• Dorsal root

• Ventral root

What is the function of the dorsal root ganglion?

• To store energy

• To house sensory neuron cell bodies

• To transmit motor impulses

• To protect the relay neurones

What is the role of the myelin sheath in the nervous system?

• To connect neurons to blood vessels

• To slow down nerve impulses

• To insulate and speed up nerve impulses

• To store neurotransmitters