The blood pressure in the large systemic arteries is greatest during:
Ventricular systole.
Atrial diastole.
Ventricular diastole.
Atrial systole.
The Correct Answer is A
This is because ventricular systole is the phase of the cardiac cycle when the ventricles contract and pump blood into the arteries.
The blood pressure in the arteries is greatest during this phase because of the forceful ejection of blood.
Choice B.
Atrial diastole is wrong because atrial diastole is the phase of the cardiac cycle when the atria relax and fill with blood from the veins.
The blood pressure in the arteries is lowest during this phase because the ventricles are also relaxed and not pumping blood.
Choice C.
Ventricular diastole is wrong because ventricular diastole is the phase of the cardiac cycle when the ventricles relax and fill with blood from the atria.
The blood pressure in the arteries is low during this phase because the ventricles are not pumping blood.
Choice D.
Atrial systole is wrong because atrial systole is the phase of the cardiac cycle when the atria contract and push blood into the ventricles.
The blood pressure in the arteries is not affected by this phase because the ventricles are still relaxed and not pumping blood.
The normal range for systolic blood pressure is less than 120 mm Hg and for diastolic blood pressure is less than 80 mm Hg.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
As a result of the allergen-antibody reaction, mast cells release histamine.
This is because when mast cells are exposed to an allergen that binds to IgE antibodies attached to their FcɛRI receptors, they release histamine and other inflammatory mediators.
Histamine causes vasodilation, increased capillary permeability, mucus secretion, and smooth muscle contraction, which result in allergic symptoms such as itching, swelling, sneezing, and wheezing.
Mast cells do release histamine in response to allergen-antibody reactions. Some additional sentences are:
Normal ranges of histamine levels vary depending on the tissue and the method of measurement, but they are usually low in healthy individuals and elevated in allergic conditions.
Histamine can be degraded by enzymes such as diamine oxidase and histamine N- methyltransferase, or inhibited by drugs such as antihistamines.
Correct Answer is B
Explanation
Circulation is the movement or flow of something, especially blood or air, through a circuit or a specific course.
Circulation supplies oxygen and nutrients to and removes wastes from tissues. This is essential for the survival and functioning of cells and organs.
Choice A is wrong because circulation does not inflate the lungs.
The lungs are inflated by the pressure difference between the air inside and outside the chest cavity.
Choice C is wrong because circulation does not deliver waste to tissues.
Circulation removes wastes from tissues and delivers them to the excretory organs such as the kidneys and the lungs.
Choice D is wrong because circulation does not deliver carbon dioxide to tissues and removes excess oxygen.
Circulation does the opposite: it delivers oxygen to tissues and removes carbon dioxide.
Carbon dioxide is a waste product of cellular respiration that needs to be eliminated from the body.
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