Unit 3: SNS vs ANS

Question 1

Effector of SNS

Answer 1

Skeletal muscle

Question 2

Effector of ANS

Answer 2

Smooth muscle
Cardiac muscle
Glands

Question 3

Is SNS voluntary or involuntary?

Answer 3

Both

Question 4

Is ANS voluntary or involuntary?

Answer 4

Involuntary ONLY, deals with visceral reflexes

Question 5

Does SNS have excitatory or inhibitory effects?

Answer 5

Excitatory ONLY

Question 6

Does ANS have excitatory or inhibitory effects?

Answer 6

Both

Question 7

Where is the lower motor neuron located in SNS?

Answer 7

Brain stem (motor cranial nerves), specifically in the ventral horn

Question 8

Where is the lower motor neuron located in ANS?

Answer 8

There are 2 lower motor neurons:

Preganglionic - in CNS
Postganglionic - in PNS

Question 9

True or False:

Ganglia are found in both SNS and ANS.

Answer 9

False; only in ANS. SNS deals with CNS, and there is no ganglia there

Question 10

What is the type of communication showcased in SNS?

Answer 10

Direct, localized, no neuronal divergence

Question 11

What is the type of communication showcased in ANS?

Answer 11

Neuronal divergence AND convergence

Question 12

Because ANS has both neuronal divergence and convergence, what does this do to its control and communication?

Answer 12

It increases control and communication bc there is a chain of two neurons

Question 13

What is the primary neurotransmitter for SNS?

Answer 13

Acetylcholine

Question 14

What is the primary neurotransmitter for ANS?

Answer 14

Acetylcholine or norepinephrine

Question 15

Are neurons of the SNS myelinated or unmyelinated?

Answer 15

Myelinated ALWAYS

Question 16

Are neurons of the ANS myelinated or unmyelinated?

Answer 16

Both

Preganglionic axon - myelinated
Postganglionic axon - unmyelinated