EDUCATION PERFECT Keeping Internal Balance - The Autonomic System Module 5 PT 2

Question 1

What is the ANS motor arm?

Answer 1

The ANS motor arm is a two-neuron chain from the Central Nervous System (CNS) to the periphery.

Question 2

Define preganglionic neuron

Answer 2

Axon runs to a ganglion

Question 3

In the two-neuron chain, what is the first neuron?

Answer 3

preganglionic neuron

Question 4

Define ganglion

Answer 4

Clustering of neuron cell bodies

Question 5

Where does the first neuron have its cell body located?

Answer 5

Brainstem
Spinal Cord

Question 6

TRUE OR FALSE When the first neuron is located in the brainstem it can only be for the parasympathetic division

Answer 6

TRUE

Question 7

TRUE OR FALSE When the first neuron is located in the spinal cord it can only be for the parasympathetic division

Answer 7

FALSE, for parasympathetic + sympathetic divisions.

Question 8

What is the process of the two-neuron chain from the CNS to the periphery?

Answer 8

Preganglionic neuron, as its axon runs to a ganglion where it then synapses with the second neuron in the chain, the post-ganglionic neuron, then reaches target tissue.

Question 9

How does the ANS motor arm differ from the control of skeletal muscle by the Somatic Nervous System?

Answer 9

In the control of skeletal muscle, the α (alpha) motor neuron sends the CNS output directly to the target muscle, while in the ANS motor arm, the motor output from the CNS follows a two-neuron chain through the ganglion before reaching the target tissue.

Question 10

What is the advantage of the two-neuron chain in the ANS motor arm?

Answer 10

Although it slows down control of body systems, it allows integration of many inputs at the ganglion, providing a point for input integration.