PHYSIOLOGY
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Question 1 of 2
1. Question
1 pointsWhich of the following will increase as a result of stimulating parasympathetic nerves to the bronchial smooth muscle?
Correct
D. The tone of bronchial smooth muscle is under autonomic control. Stimulation of sympathetic nerves causes bronchodilation, whereas parasympathetic stimulation via the vagus nerve causes bronchoconstriction. Bronchoconstriction reduces the radius of the airway the thereby decreases anatomic dead space and increases airway resistance, which consequently increases the resistive work of breathing. Bronchoconstriction has no significant effect on the elastic properties of the lung.
Incorrect
D. The tone of bronchial smooth muscle is under autonomic control. Stimulation of sympathetic nerves causes bronchodilation, whereas parasympathetic stimulation via the vagus nerve causes bronchoconstriction. Bronchoconstriction reduces the radius of the airway the thereby decreases anatomic dead space and increases airway resistance, which consequently increases the resistive work of breathing. Bronchoconstriction has no significant effect on the elastic properties of the lung.
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Question 2 of 2
2. Question
1 pointsWhich of the following sugars IS absorbed from the small intestine by facilitated diffusion?
Correct
C. Facilitated diffusion is the major transport route for fructose. The duodenum and jejunum are the principal sites of carbohydrate absorption in humans. Digestion of carbohydrate is accomplished by amylase and brush border enzymes and results in a mixture of glucose, fructose, and Galactose. A common sodium dependent secondary active transporter absorbs glucose and Galactose. Sucrose and lactose are disaccharides that break down into glucose and fructose, and glucose and Galactose, respectively.
Incorrect
C. Facilitated diffusion is the major transport route for fructose. The duodenum and jejunum are the principal sites of carbohydrate absorption in humans. Digestion of carbohydrate is accomplished by amylase and brush border enzymes and results in a mixture of glucose, fructose, and Galactose. A common sodium dependent secondary active transporter absorbs glucose and Galactose. Sucrose and lactose are disaccharides that break down into glucose and fructose, and glucose and Galactose, respectively.
