When pressure in the lungs drops lower than atmospheric pressure, what occurs?.
A pneumothorax forms, collapsing the lungs.
The bronchioles constrict, causing respiratory distress.
Air flows into the lungs.
Air flows out of the lungs.
The Correct Answer is C
The correct answer is: c. Air flows into the lungs.
Choice A: A pneumothorax forms, collapsing the lungs.
A pneumothorax occurs when air enters the pleural space, the area between the lung and the chest wall, causing the lung to collapse. This condition is typically caused by trauma or a spontaneous rupture of a lung bleb, not by a drop in lung pressure below atmospheric pressure. When the pressure in the lungs drops below atmospheric pressure, it facilitates the inflow of air into the lungs, not the collapse of the lungs.
Choice B: The bronchioles constrict, causing respiratory distress.
Bronchiolar constriction, or bronchoconstriction, is a narrowing of the airways in the lungs due to the tightening of surrounding smooth muscle. This can cause respiratory distress and is commonly seen in conditions like asthma. However, this is not directly related to the pressure changes in the lungs relative to atmospheric pressure. The primary effect of a drop in lung pressure below atmospheric pressure is the inflow of air, not bronchoconstriction.
Choice C: Air flows into the lungs.
When the pressure in the lungs drops below atmospheric pressure, a pressure gradient is created that allows air to flow into the lungs. This process is known as inspiration or inhalation. The diaphragm and intercostal muscles contract to increase the volume of the thoracic cavity, thereby decreasing the pressure within the lungs relative to the outside atmosphere, causing air to rush in.
Choice D: Air flows out of the lungs.
Air flows out of the lungs, or expiration, occurs when the pressure inside the lungs exceeds atmospheric pressure. This happens when the diaphragm and intercostal muscles relax, decreasing the volume of the thoracic cavity and increasing the pressure within the lungs. This is the opposite of what happens when lung pressure drops below atmospheric pressure.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale:
Hemoglobin is an iron-containing biomolecule that binds oxygen and is responsible for the red color of the cells and the blood. -
Choice B rationale:
Hematocrit is not an iron-containing component, but rather a measure of the proportion of blood volume that is occupied by red blood cells. -
Choice C rationale:
Cytoplasm is the fluid inside the cell where cellular components are suspended, but it does not contain iron. -
Choice D rationale:
The nucleus is not present in mature red blood cells.
Correct Answer is D
Explanation
Naturally acquired active immunity occurs when the body produces antibodies in response to an infection or vaccine. This is not the case for antibodies passed through the placenta.
Choice B rationale:
Artificially acquired passive immunity involves the injection of antibodies, not the transfer through the placenta.
Choice C rationale:
Innate immunity refers to nonspecific defense mechanisms that come into play immediately or within hours of an antigen’s appearance in the body. This does not describe the process of antibody transfer through the placenta.
Choice D rationale:
Natural passive immunity occurs when antibodies are passed from the mother to the fetus through the placenta. This matches the description in the question.
So, the correct answer is Choice D, after analyzing all choices.
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