Which scenario will cause pulmonary ventilation to rise?
Increased surface tension
Increased lung compliance
Fewer alveolar sacs
More airway resistance
The Correct Answer is B
A. Increased surface tension: This would decrease ventilation as it increases the force needed to expand the lungs.
B. Increased lung compliance: Compliance refers to how easily the lungs can expand. Increased compliance makes it easier for the lungs to inflate, thereby increasing ventilation.
C. Fewer alveolar sacs: Having fewer alveolar sacs reduces the surface area for gas exchange, which would likely reduce ventilation efficiency.
D. More airway resistance: Increased airway resistance makes it harder to breathe, so it would reduce ventilation rather than increase it.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. To ensure that the uterus is securely connected to the supporting ligaments: This is not the primary function of the middle layer (myometrium); rather, the supporting ligaments provide stability to the uterus.
B. To allow the uterus to shed tissue during menstruation: This is primarily the function of the endometrium, the inner layer of the uterine wall.
C. To allow the uterus to contract during childbirth to expel the fetus: The middle layer, known as the myometrium, is composed of smooth muscle that contracts during labor to help expel the fetus.
D. To provide the uterus with adequate space to grow a fetus: While the uterine structure allows for fetal growth, the myometrium’s primary role is in contractions rather than providing space.
Correct Answer is C
Explanation
A. Aldosterone hormone: Aldosterone affects sodium and potassium reabsorption, increasing water retention indirectly, but it does not directly increase water permeability in the collecting ducts.
B. Atrial natriuretic peptide hormone: This hormone decreases blood volume by inhibiting sodium reabsorption, leading to more water excretion, not reabsorption.
C. Antidiuretic hormone (ADH): ADH increases the permeability of the collecting ducts to water, allowing more water to be reabsorbed into the bloodstream.
D. Parathyroid hormone: This hormone primarily regulates calcium levels, not water permeability.
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