ATI LPN
PN Learning System Medical Surgical Endocrine Practice Quiz Questions
Question 1 of 5
Which of the following is FALSE regarding gastrin?
Correct Answer: C
Rationale: VIP, GIP, and glucagon do not stimulate gastrin; atropine doesn't inhibit it, amino acids do stimulate, secretin inhibits, and epinephrine can increase it.
Question 2 of 5
Which actual structural unit secretes insulin?
Correct Answer: C
Rationale: The actual structural unit that secretes insulin is the beta cell. Beta cells are found on the islets of Langerhans, which are in the pancreas.
Question 3 of 5
Which gland is the only gland that is both an endocrine gland and an exocrine gland?
Correct Answer: C
Rationale: The pancreas acts as an endocrine gland, secreting insulin directly into the bloodstream, and an exocrine gland, secreting digestive enzymes through ducts.
Question 4 of 5
What type of signalling occurs when neurons release chemical signal molecules which influence the activity and behaviour of neighbouring neurons?
Correct Answer: B
Rationale: Synaptic signalling involves neurons releasing neurotransmitters at synapses to affect nearby neurons, which is a rapid and localized process.
Question 5 of 5
Parathyroid hormone (PTH) contributes to the process of bone remodelling and helps to maintain homeostasis of blood calcium | In the presence of parathyroid hormone (PTH), osteoclasts can break down bone and release calcium into the bloodstream
Correct Answer: A
Rationale: The Assertion (A) is TRUE because PTH aids bone remodelling and calcium homeostasis. The Reason (R) is TRUE as PTH stimulates osteoclasts to release calcium from bone. R explains A, as this mechanism is how PTH maintains blood calcium levels.