Transient increase in BP occur as normal adaptations ___.
during certain changes in posture
being emotionally upset
during physical exertion
all of the above
during fever
The Correct Answer is D
A. During certain changes in posture: Blood pressure can transiently rise when moving from a lying to standing position as part of the baroreceptor-mediated response to maintain cerebral perfusion. This is a normal short-term adaptation to postural changes.
B. Being emotionally upset: Emotional stress or excitement activates the sympathetic nervous system, causing temporary increases in heart rate and peripheral resistance, which elevate blood pressure. This is a normal physiological response to emotional stimuli.
C. During physical exertion: Exercise increases cardiac output and sympathetic activity, leading to a transient rise in blood pressure to meet the metabolic demands of active muscles. This is an expected adaptation during physical activity.
D. All of the above: All the listed situations-postural changes, emotional upset, and physical exertion-can cause transient increases in blood pressure as normal adaptive responses. These elevations are temporary and return to baseline once the stimulus is removed.
E. During fever: Fever can slightly increase heart rate and cardiac output, but it does not consistently cause significant transient rises in blood pressure compared with the other listed stimuli, making it less directly related to normal BP adaptations.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Regulatory T cells:Regulatory T cells suppress immune responses and promote tolerance to self and foreign antigens. They help prevent excessive immune reactions, including tissue rejection, making them least likely to cause rejection after an organ transplant.
B. Natural killer cells:NK cells can recognize and destroy cells lacking normal MHC expression, including transplanted tissue. They contribute to early immune responses that may lead to graft rejection.
C. B cells:B cells produce antibodies against foreign antigens on transplanted tissue, leading to humoral-mediated rejection. Their activity can directly damage the graft and trigger complement-mediated injury.
D. Cytotoxic T cells:Cytotoxic T cells recognize foreign MHC molecules on transplanted tissue and destroy those cells. They play a central role in cellular-mediated graft rejection and are a major contributor to transplant failure.
E. Macrophages:Macrophages are recruited to the graft site, where they participate in inflammation, antigen presentation, and tissue destruction. Their activity supports both cellular and humoral mechanisms of transplant rejection.
Correct Answer is C
Explanation
A. Pulmonary trunk:The pulmonary trunk carries deoxygenated blood from the right ventricle to the lungs for oxygenation. It does not contain oxygenated blood at any point before reaching the pulmonary circulation.
B. Lobar arteries:Lobar arteries are branches of the pulmonary arteries that also carry deoxygenated blood to specific lobes of the lungs. Their role is in transporting blood to the lungs, not returning oxygenated blood.
C. Pulmonary veins:Pulmonary veins carry oxygenated blood from the lungs back to the left atrium of the heart. They are unique among veins in that they transport oxygen-rich blood rather than deoxygenated blood, making them the correct choice.
D. Pulmonary arteries:Pulmonary arteries carry deoxygenated blood away from the right ventricle toward the lungs. Despite being arteries, they do not carry oxygenated blood, as their function is to deliver blood for gas exchange.
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