Author Question: What brings information from the central nervous system (CNS) to the peripheral nervous system ... (Read 75 times)

debasdf · **on:** Jul 23, 2018

What brings information from the central nervous system (CNS) to the peripheral nervous system (PNS)?

A) Motor nerves
B) Synapses
C) Afferent neurons
D) Sensory nerves

Question 2

A 16-year-old girl comes to the clinic complaining of severe menstrual cramps. The girl is concerned about the pain and worried that something is wrong.

The nurse explains to the patient that she has cramping during her menstrual period because of what? A) An increase in the levels of estrogen and progesterone, which cause uterine contractions
B) Low levels of plasminogen in the uterus that cause the shedding of the lining of the uterus
C) Prostaglandins in the uterus, which stimulate uterine contractions to clamp off vessels as the lining of her uterus sheds
D) An increase in progesterone and a decrease of estrogen cause the lining of the uterus to slough away

mammy1697 · **Reply #1 on:** Jul 23, 2018

Answer to Question 1

D
Feedback:
The PNS is composed of sensory receptors that bring information into the CNS and motor nerves that carry information away from the CNS to facilitate response to stimuli. Synapses are the gaps between neurons. Afferent fibers are nerve axons that run from the peripheral receptors into the CNS.

Answer to Question 2

C
Feedback:
Prostaglandins in the uterus stimulate uterine contractions to clamp off vessels in the lining of the uterus, which is the cause of the cramping. The decrease of estrogen and progesterone after the involution of the corpus luteum triggers the release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The decreased levels of FSH and LH cause the inner lining of the uterus to slough off because the vascular system is no longer being stimulated. High, not low, levels of plasminogen in the uterus prevent clotting of the lining as the vessels shear off.