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 E
Explanation
A. Liver:The liver is involved in metabolism, detoxification, and some immune functions like Kupffer cell activity, but it is not a site for T cell maturation or development of immunocompetence.
B. Spleen:The spleen is a secondary lymphoid organ where mature T cells encounter antigens, but it does not confer immunocompetence. It primarily filters blood and supports immune responses.
C. Bloodstream:T cells circulate in the bloodstream after becoming immunocompetent. The blood serves as a transport medium but is not a site for T cell maturation or education.
D. Bone marrow:While T cells originate from hematopoietic stem cells in the bone marrow, they do not achieve immunocompetence there. Bone marrow is the site for B cell maturation, not T cell education.
E. Thymus:The thymus is the primary lymphoid organ where T cells undergo differentiation, selection, and maturation. It provides the necessary environment for developing functional T cell receptors and self-tolerance, making it the site of T cell immunocompetence.
Correct Answer is C
Explanation
A. smaller than; no neuronal:The anterior pituitary is actually larger than the posterior pituitary. While it does not have a direct neuronal connection, this choice incorrectly describes its size.
B. smaller than; a neuronal:This is incorrect because the anterior pituitary is larger, not smaller, and it does not have a direct neuronal connection to the hypothalamus.
C. larger than; no neuronal:The anterior pituitary is larger than the posterior pituitary and communicates with the hypothalamus via the hypophyseal portal system, a vascular connection, not a neuronal one. This allows hypothalamic releasing and inhibiting hormones to regulate anterior pituitary function.
D. similar in size to; no neuronal:The anterior pituitary is not similar in size to the posterior; it is significantly larger and constitutes the majority of the pituitary gland mass.
E. larger than; a neuronal:While the anterior pituitary is larger, it does not have a direct neuronal connection to the hypothalamus. Its regulation is via blood vessels, not neurons.
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