Arrange the following events in the proper sequence:
1)Efferent neuron reaches threshold and fires an action potential.
2)Afferent neuron reaches threshold and fires an action potential.
3)Effector organ responds by performing output.
4)Integrating center reaches decision about response.
5)Sensory organ detects change in the environment.
A) 2, 3, 5, 1, 4
B) 5, 2, 4, 1, 3
C) 5, 1, 4, 2, 3
D) 5, 3, 4, 2, 1
E) 3, 1, 4, 2, 5

Question

Quizplus · Accepted Answer

The sequence of events in a reflex arc is as follows: 
1) Sensory organ detects change in the environment (5) 
2) Afferent neuron reaches threshold and fires an action potential (2) 
3) Integrating center reaches decision about response (4) 
4) Efferent neuron reaches threshold and fires an action potential (1) 
5) Effector organ responds by performing output (3)

Therefore, the correct sequence is 5, 2, 4, 1, 3, which corresponds to option B.

Arrange the Following Events in the Proper Sequence