Is the underlined word(s) a participle or a verb? read the sentence. where is that (banging) -underlined word-noise coming from? which best identifies the function of the underlined word?

The answer is definitely a Verb

i mean think about it, "banging" is a loud sound and the main meaning of verb is something like hear, become, happen, or a action. Plus, the sentence says "where is that "banging"  noise coming from"

So obviously, its something they heard, IF it were a noun it would probably be a place, thing, person.

But overall, the answer is Verb. Hope this answers your question!

Kidneys are an extremely important part in the full functionality of the body they not only eliminate toxins but they regulate the levels of salt, potassium, and acid. They also produce hormones that helo other organs to function.

The kidneys are involved in several processes like removing waste products from the body, removing drugs from the body, balancing the body's fluids, releasing  hormones that regulate blood pressure , producing an active form of vitamin D that promotes strong, healthy bones and controlling the production of red blood cells