Chapter 33, Problem 5A

Summary Introduction

Introduction:

Neurons are specialized cells that help to collect external information, analyze the information, and respond to it. Neurons make up a large signaling network, called the nervous system, in the body. A neuron mainly consists of three regions: an axon, the dendrites and a cell body. There are three groups of neurons: sensory neurons, motor neurons, and interneurons.

Answer to Problem 5A

Correct answer :

The correct answer is option (C) slows the heart rate

Explanation of Solution

Explanation/justification for the correct answer :

Option (C) slows the heart rate. The sympathetic nervous system is most effective in times of emergency or stress when heart rate and respiratory rate increase. So, the correct answer is option (C).

Explanation for incorrect answer :

Option (A) stimulates digestion. The digestion rate takes place in the parasympathetic nervous system. So, this is an incorrect answer.

Option (B) interneuron - motor neuron - sensory neuron. Sensory neurons send signals to interneurons, and interneurons pass the motor neuron impulse. So, this is an incorrect answer.

Option (C) motor neuron - sensory neuron - interneuron. The interneuron receives signals from sensory neuron and interneuron carry the impulse to the motor neuron. So, this is an incorrect answer.