In the air we breathe, which gas is found in the highest concentration?
Nitrogen
Water vapor
Carbon dioxide
Hydrogen
Oxygen
The Correct Answer is A
A. Nitrogen: Nitrogen makes up approximately 78% of the air we breathe, making it the most abundant gas in the atmosphere. It is largely inert and does not participate directly in human respiration.
B. Water vapor: Water vapor is present in variable amounts depending on humidity but generally constitutes a very small fraction of air, far less than nitrogen. Its concentration is not sufficient to be the highest component.
C. Carbon dioxide: Carbon dioxide is present at only about 0.04% in the atmosphere. Despite its critical role in respiration and pH regulation, it is not the major constituent of inhaled air.
D. Hydrogen: Hydrogen exists in trace amounts in the atmosphere and plays no significant role in the composition of breathable air. Its concentration is negligible compared to nitrogen or oxygen.
E. Oxygen: Oxygen makes up roughly 21% of atmospheric air, making it the second most abundant gas. While essential for cellular respiration, its concentration is much lower than that of nitrogen.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
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Explanation
The chordae tendineae are thin, strong, fibrous cords that connect the papillary muscles to the atrioventricular (AV) valves-in this case, the tricuspid valve on the right side of the heart. They prevent the valve leaflets from inverting into the atrium during ventricular contraction, ensuring one-way blood flow from the atria to the ventricles.
Correct Answer is A
Explanation
The immune system spans nearly every organ and tissue in the body because immune cells circulate continuously through the bloodstream and lymphatic system. Lymphoid tissues such as the bone marrow, thymus, lymph nodes, spleen, tonsils, Peyer’s patches, and mucous membranes all play key roles in immune defense. Organs like the skin, lungs, and gastrointestinal tract contain specialized immune cells that detect and respond to pathogens.
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