In a blood pressure reading of 110/70, the higher value (110) is the ______ pressure.
diastolic
repolarization
systolic
depolarization
The Correct Answer is C
A. Diastolic: Diastolic pressure is the lower number in a blood pressure reading. It represents the pressure in the arteries when the heart is relaxed between beats, not the higher value.
B. Repolarization: Repolarization refers to the process of cardiac muscle cells returning to a resting electrical state after contraction. It is not directly measured in a blood pressure reading.
C. Systolic: Systolic pressure is the higher number in a blood pressure reading. In this example, 110 mmHg represents the arterial pressure when the ventricles contract, pushing blood into the arteries.
D. Depolarization: Depolarization is the process by which cardiac cells generate an action potential to initiate contraction. It is an electrical event and does not correspond to the numeric values of blood pressure.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is E
Explanation
A. Superior and inferior venae cavae:The venae cavae carry deoxygenated blood from the body into the right atrium, not toward the lungs. They are part of systemic venous return, not pulmonary circulation.
B. Aorta and pulmonary arteries:The aorta carries oxygenated blood from the left ventricle to the body, so it does not transport blood to the lungs. Only the pulmonary arteries are involved in carrying blood toward the lungs.
C. Pulmonary trunk and veins:The pulmonary veins carry oxygenated blood from the lungs to the left atrium, which is away from the lungs. Only the pulmonary trunk directs blood toward the lungs.
D. Pulmonary arteries and veins:While the pulmonary arteries carry deoxygenated blood to the lungs, the pulmonary veins return oxygenated blood to the heart. Only arteries carry blood toward the lungs.
E. Pulmonary trunk and arteries:The pulmonary trunk originates from the right ventricle and branches into the left and right pulmonary arteries, which transport deoxygenated blood to the lungs for oxygenation. This makes them the correct structures for carrying blood toward the lungs.
Correct Answer is B
Explanation
A. Squamous alveolar cells:Squamous alveolar cells (type I pneumocytes) form the thin lining of alveoli to facilitate gas exchange. They do not produce mucus and are not involved in air cleansing.
B. Goblet cells:Goblet cells are specialized epithelial cells found in the respiratory tract that secrete mucus. This mucus traps dust, pathogens, and other particles in inhaled air, playing a critical role in respiratory defense.
C. Great alveolar cells:Great alveolar cells (type II pneumocytes) secrete pulmonary surfactant to reduce alveolar surface tension. They do not produce mucus or participate directly in cleansing inhaled air.
D. Ciliated cells:Ciliated epithelial cells help move mucus along the respiratory tract through coordinated beating of cilia, but they do not secrete mucus themselves.
E. The pleurae:The pleurae are membranes surrounding the lungs and lining the thoracic cavity. They produce pleural fluid to reduce friction during breathing but do not produce mucus.
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