What is true for all of the enzymes that digest protein?
They are secreted in an inactive form.
They are activated by HCI.
They are secreted by the pancreas.
Their release is stimulated by enterokinase.
The Correct Answer is A
A. They are secreted in an inactive form: major proteases of the GI tract (pepsinogen, trypsinogen, chymotrypsinogen, etc.) are secreted as zymogens (inactive precursors) to prevent autodigestion.
B. They are activated by HCl: pepsinogen is activated by HCl, but pancreatic proteases are activated by trypsin, not HCl, so this is not true for all protein-digesting enzymes.
C. They are secreted by the pancreas: many proteases (e.g., pepsin) are secreted by the stomach, so not all are pancreatic.
D. Their release is stimulated by enterokinase: enterokinase (enteropeptidase) activates trypsinogen to trypsin in the small intestine but does not stimulate the release of all proteases; it is an activator, not a universal release stimulus.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. pleural: the pleura lines the thoracic cavity and lungs, not the greater omentum.
B. pericardial: the pericardium surrounds the heart, not the abdominal organs.
C. hiatal: “hiatal” refers to the esophageal hiatus (an opening) and is not the membrane composing the omentum.
D. peritoneal: the greater omentum is a large fold of peritoneum (a double-layered peritoneal membrane) that hangs from the stomach.
Correct Answer is A
Explanation
A. Macrophages -Alveolar macrophages (dust cells) engulf debris, dust, and pathogens.
B. Surfactant -Surfactant reduces surface tension, preventing alveolar collapse, but does not remove particles.
C. Antibodies -Antibodies neutralize pathogens but do not actively remove inhaled particles.
D. Lymphocytes -Lymphocytes mediate immune responses but are not the main mechanism for clearing inhaled debris.
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