Atens unit is
select one:
a. used to treat chronic pain
b. an electrical recording of the brain waves
c. a surgical procedure to remove plaque and prevent a stroke
d. a unit of measurement for the depth of a coma

A TENS unit is Used to treat Chronic Pain.  

Option A

Explanation:  

Transcutaneous electric nerve stimulation it is a electronic device which tends to send the current waves to the affected body parts so that with the help of electrical therapy the chronic pain can be easily dealt with.

It is generally a bigger unit used in the administrative offices like hospitals or a nursing home but you can safely use them at home for better results. The electric current is mild in nature so can be used easily and there is no harm involved.

the major parts of the digestive system:

salivary glands.

pharynx.

esophagus.

stomach.

small intestine.

large intestine.

rectum.

accessory digestive organs: liver, gallbladder, pancreas.

a. suckling by young

b. hypothalamus

c. dopamine

d. trh

e. anterior pituitary

f. mammary glands

g. milk production