2.2 Reflex Actions

Question 1

Describe the process of a reflex action.

Answer 1

A receptor detects a stimulus, a sensory neuron transmits the impulse to the CNS, at a junction (synapse) between two neurones chemicals transmit the impulse across the gap, a relay neurone passes the impulse on, a motor neurone is stimulated, the impulse passes to the effector, and the action is taken

Question 2

What is the junction between two neurones called?

Answer 2

A synapse

Question 3

How does an electrical impulse travel across a synapse?

Answer 3

By chemicals transmitting the impulse

Question 4

What is the sequence called from receptor to effector?

Answer 4

Reflex arc