A decrease in heart rate and blood pressure is the result of activating which nervous system?
Somatic
Afferent
Sympathetic
Parasympathetic
The Correct Answer is D
A. Somatic: The somatic nervous system controls voluntary skeletal muscle movements and does not produce decreases in heart rate or blood pressure.
B. Afferent: Afferent pathways carry sensory information to the CNS; they are not a motor division that directly lowers heart rate and blood pressure.
C. Sympathetic: Sympathetic activation raises heart rate and blood pressure as part of the fight-or-flight response.
D. Parasympathetic: Parasympathetic (vagal) activation slows SA node firing and reduces heart rate, and can lower blood pressure indirectly by decreasing cardiac output.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Cerebrospinal fluid: Surrounds and cushions the brain and spinal cord, providing protection, nutrient transport, and waste removal.
B. Synovial fluid: Found in freely movable joints to reduce friction and nourish cartilage, not around the CNS.
C. Serous fluid: Present between layers of serous membranes (e.g., pleura, pericardium, peritoneum), not around the CNS.
D. Plasma: The liquid portion of blood, circulating in vessels, not bathing the CNS directly.
Correct Answer is D
Explanation
A. Pulmonary veins: These vessels return oxygenated blood from the lungs to the left atrium, not to the rest of the body.
B. Pulmonary arteries: These transport deoxygenated blood from the right ventricle to the lungs for oxygenation.
C. Superior vena cava: This large vein delivers deoxygenated blood from the upper body into the right atrium.
D. Aorta: This is the main artery that carries oxygen-rich blood from the left ventricle to systemic circulation.
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