Enzymes like amylase, lipase, and nuclease are secreted in their active forms because they
Help buffer chyme
Are absorbed in the stomach
Are already denatured
Don't harm pancreatic tissue
The Correct Answer is D
A. Help buffer chyme: Buffering is primarily performed by bicarbonate ions secreted by the ductal cells, not the digestive enzymes. These enzymes focus on the hydrolysis of macromolecules. They do not have the chemical properties to neutralize acid.
B. Are absorbed in the stomach: These enzymes are secreted into the duodenum for intestinal digestion. They are proteins themselves and would be denatured by the low pH of the stomach. Their site of action is distal to the pylorus.
C. Are already denatured: If these enzymes were denatured, they would lose their tertiary structure and catalytic functionality. The pancreas secretes them in a functional state to ensure nutrient breakdown. Denaturation would render them useless for digestion.
D. Don't harm pancreatic tissue: Unlike proteases, which are secreted as inactive zymogens to prevent autodigestion, these enzymes do not digest the structural lipids or proteins of the pancreas. They only target specific dietary substrates. This prevents acute pancreatitis.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Secretion of digestive enzymes:The large intestine does not produce endogenous digestive enzymes. Any remaining chemical digestion in the colon is performed by the resident microbiota. The colonic mucosa is specialized for reclamation rather than catalytic secretion.
B. Breakdown of food particles:Mechanical and chemical breakdown is largely completed by the time chyme reaches the cecum. The large intestine focuses on consolidating waste rather than further degradation. Digestion is a function of the upper gastrointestinal tract.
C. Absorption of water, salts, and vitamins:Colonic enterocytes possess specialized ion transporters and water channels to desiccate fecal matter. They also absorb electrolytes and vitamins, such as Vitamin K, synthesized by bacterial flora. This maintains systemic fluid and electrolyte homeostasis.
D. Production of mucus:Mucus is synthesized and secreted by goblet cells, which are distinct from the absorptive enterocytes. While mucus is abundant in the colon to lubricate feces, it is not the product of the enterocytes. These two cell types have different roles.
Correct Answer is B
Explanation
False:The liver is divided into two primary lobes by the falciform ligament (labeled C). The right lobeis the significantly larger portion (labeled A). The left lobeis the smaller portion located on the opposite side of the ligament, which is where letter D is pointing.
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