One atmosphere (1 atm) is equal to 760 mmHg, which is the atmospheric pressure at sea level.
True
False
The Correct Answer is A
Correct answer: True
One atmosphere (1 atm) is the standard unit used to describe atmospheric pressure at sea level and is defined as 760 millimeters of mercury (mmHg). This measurement represents the weight of the air column above a given point on Earth and serves as a reference for calculating gas pressures in respiratory physiology. Understanding that 1 atm equals 760 mmHg is essential when applying Dalton’s and Henry’s laws to determine partial pressures of oxygen and carbon dioxide in the lungs and blood. Changes in altitude or environmental conditions alter atmospheric pressure, but at sea level, 760 mmHg accurately reflects the standard atmospheric pressure.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Decreased airway resistance: Parasympathetic stimulation actually increases airway resistance by causing constriction of smooth muscles in the bronchioles. Decreased resistance occurs under sympathetic activation, which relaxes bronchial smooth muscles.
B. Enlargement of the airway diameter: Airway dilation is a result of sympathetic stimulation, particularly via beta-2 adrenergic receptors. Parasympathetic activity produces the opposite effect, narrowing the bronchioles rather than enlarging them.
C. Increased airflow: Increased airflow is associated with bronchodilation under sympathetic control. Parasympathetic activation reduces airflow due to bronchoconstriction, which can limit the volume of air entering the alveoli.
D. Narrowing of the bronchioles: Parasympathetic stimulation releases acetylcholine, which binds to muscarinic receptors on bronchial smooth muscle, causing constriction. This bronchoconstriction increases airway resistance and is a key feature of parasympathetic influence on the respiratory system.
Correct Answer is A
Explanation
A. Heme: Heme is the iron-containing component of hemoglobin responsible for binding oxygen molecules. Each hemoglobin molecule contains four heme groups, and the iron ion at the center of each heme binds one oxygen molecule, allowing hemoglobin to transport oxygen efficiently from the lungs to peripheral tissues.
B. Collagen: Collagen is a structural protein found in connective tissues, skin, and bones. It does not participate in oxygen transport or bind oxygen and is unrelated to hemoglobin function.
C. Myosin: Myosin is a motor protein in muscle tissue responsible for contraction and movement. It has no role in oxygen transport or hemoglobin structure.
D. Globin: Globin refers to the protein chains (alpha and beta) of hemoglobin that provide structural support and influence hemoglobin’s shape and function. While essential for hemoglobin stability, globin does not directly bind oxygen; that role is performed by the heme groups.
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