ATI RN
Digestive System Questions Questions
Question 1 of 5
Which is the longest organ of digestive system in human body?
Correct Answer: B
Rationale: The small intestine is the longest part of the digestive system, measuring about 7 meters (22 feet). Its main functions are to complete the digestion of food and to absorb nutrients.
Question 2 of 5
Starch is digested to maltose by the enzyme amylase. According to the 'lock and key' hypothesis, which is the 'key' and which is the 'lock'?
Correct Answer: A
Rationale: In the lock and key model, the enzyme (amylase) is the key that specifically binds to the substrate (starch), acting as the lock.
Question 3 of 5
The pH in the mouth decreases after eating. Which statement explains the decrease in pH?
Correct Answer: A
Rationale: Bacterial metabolism of food releases acids, lowering the pH in the mouth.
Question 4 of 5
Which of the following secretions is NOT produced by gastric glands?
Correct Answer: D
Rationale: Sebum is an oily substance produced by sebaceous glands in the skin, not by gastric glands, which secrete HCl, intrinsic factor, and pepsin.
Question 5 of 5
What is the structural composition of the liver?
Correct Answer: A
Rationale: The liver consists of lobules, functional units where hepatocytes radiate from a central vein, facilitating its metabolic roles.