When the pressure in the lung is greater than atmospheric pressure:
inspiration occurs.
expiration occurs.
lung tissue has collapsed.
the bronchioles are obstructed.
The Correct Answer is B
A. inspiration occurs: Inspiration happens when intrapulmonary pressure is lower than atmospheric pressure, drawing air in.
B. expiration occurs: According to Boyle's Law, air moves from areas of high pressure to low pressure. If the pressure inside the lungs is higher than the outside air, air is forced out.
C. lung tissue has collapsed: A collapsed lung (pneumothorax) occurs when the pressure in the pleural space equals atmospheric pressure, not necessarily when lung pressure is higher.
D. the bronchioles are obstructed: Obstruction changes resistance to airflow, but the pressure gradient itself is what defines the phase of breathing.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. proliferative: This phase occurs before ovulation, during which the uterine lining builds up.
B. follicular: This phase occurs before ovulation, while the egg is maturing inside the follicle.
C. luteal: This is the correct phase; it begins after ovulation (formation of the corpus luteum) and ends when menses starts.
D. estrogenic: This is not a formal phase name, though it describes the time when estrogen is the dominant hormone (pre-ovulation).
Correct Answer is B
Explanation
A. sodium: While some sodium leaks in, the resting membrane is significantly less permeable to sodium than to potassium.
B. potassium: The resting neuronal membrane has "leaky" channels that are specifically permeable to K + , allowing it to diffuse out down its concentration gradient.
C. proteins: Intracellular proteins are large, negatively charged molecules that cannot cross the membrane.
D. phosphate: Like proteins, phosphate ions are trapped inside the cell and cannot diffuse across the resting membrane.
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