Question

True or False

A. Norepinephrine has a stimulatory effect on all the effectors of the sympathetic nervous system

B. Somatic reflexes and visceral reflexes have similarities and differences, one of the differences is that visceral reflexes do not have afferent fibers

C. In the ANS there are gray rami communicantes and white rami communicantes, the axons of the neurons that make up the gray rami communicantes are not myelinated.

D. When norepinephrine is secreted from the postganglionic fibers of the sympathetic nervous system it will have an excitatory or inhibitory effect on the effector depending upon the type of norephrin receptor is present on the effector.

E. The organs innervated by the autonomic nervous system may be inhibited or activated depending upon which division of the ANS is acting upon them and the type of receptor present on the target cells.

F. Every visceral organ that is innervated by the sympathetic nervous system is also innervated by the parasympathetic nervous system.

G. If your body temperature begins to drop it is the sympathetic nervous system will trigger effectors that will act to warm the body and conserve heat.

Answer 1

Ans :

1. True - At a first approximation, chemical transmission in the sympathetic system appears simple: preganglionic neurons use acetylcholine as a neurotransmitter, whereas most postganglionic neurons utilize norepinephrine (noradrenaline)—with the major exception that postganglionic neurons innervating sweat glands use

2. False -  Visceral afferent neurons are unipolar neurons that enter the spinal cord through the dorsal root & their cell bodies are located in the dorsal root ganglia

3. True

4. True

5. True

6. True -  Although most organs are innervated by both sympathetic and parasympathetic nerves, some-including the adrenal medulla, arrector pili muscles, sweat glands, and most blood vessels-receive only sympathetic innervation