Which law states that the total atmospheric pressure is a sum of the contributions of the individual gases?
Dalton's
Charles's
Henry's
Newton's
Boyle's
The Correct Answer is A
A. Dalton's: Dalton’s law of partial pressures states that the total pressure of a gas mixture equals the sum of the partial pressures of each individual gas. This principle is essential in understanding gas exchange and calculating oxygen and carbon dioxide pressures in the respiratory system.
B. Charles's: Charles’s law describes the direct relationship between the volume of a gas and its temperature at constant pressure. It does not address the additive nature of gas pressures.
C. Henry's: Henry’s law relates the solubility of a gas in a liquid to its partial pressure above the liquid. It governs how gases dissolve in blood but does not define total atmospheric pressure.
D. Newton's: Newton’s laws of motion describe the relationship between force, mass, and acceleration, which are unrelated to gas pressures in the atmosphere.
E. Boyle's: Boyle’s law states that gas volume varies inversely with pressure at a constant temperature. It explains behavior of gases under compression but does not address total pressure from multiple gases.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Heme groups in hemoglobin:The majority of oxygen in the blood binds to the iron-containing heme groups within hemoglobin molecules in red blood cells. Each hemoglobin molecule has four heme groups, each capable of binding one oxygen molecule, allowing efficient oxygen transport.
B. Beta chains in hemoglobin:Beta chains are part of the hemoglobin protein structure, but oxygen specifically binds to the heme groups, not the globin chains themselves. Beta chains contribute to the overall structure but are not the primary oxygen-binding site.
C. Alpha chains in hemoglobin:Similar to beta chains, alpha chains provide structural support for hemoglobin but do not directly bind oxygen. The heme groups attached to these chains are the actual oxygen-binding sites.
D. Delta chains in hemoglobin:Delta chains are present in some hemoglobin variants but are not involved in standard oxygen transport in adult hemoglobin. Oxygen binds to heme, not delta chains.
E. The plasma membrane of erythrocytes:The erythrocyte membrane does not bind oxygen. Its role is structural and in maintaining cell integrity, while oxygen transport occurs within hemoglobin inside the red blood cell.
Correct Answer is E
Explanation
A. Interventricular septum:The interventricular septum separates the left and right ventricles, providing structural support to the heart, but it does not serve as the anchor for the chordae tendineae.
B. Pectinate muscles:Pectinate muscles are found in the atrial walls, particularly in the right atrium, and are not associated with the AV valves or their chordae tendineae.
C. Interatrial septum:The interatrial septum separates the right and left atria. It has no connection to the chordae tendineae or ventricular valve function.
D. Trabeculae carneae:Trabeculae carneae are irregular muscular ridges on the ventricular walls that help in ventricular contraction, but they do not directly anchor the chordae tendineae.
E. Papillary muscles:Papillary muscles project from the ventricular walls and serve as the attachment point for the chordae tendineae. They contract during ventricular systole to prevent prolapse of the AV valves into the atria, ensuring unidirectional blood flow.
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