Which of the following changes in the body occurs with the parasympathetic nervous system?
Blood pressure increases
Bronchioles dilate
Pupils dilate
Heart rate decreases
The Correct Answer is D
A. Blood pressure increases: Parasympathetic activity tends to reduce vascular tone and cardiac output, so blood pressure usually decreases rather than rises.
B. Bronchioles dilate: The parasympathetic system causes bronchoconstriction, while bronchodilation is a sympathetic response.
C. Pupils dilate: Pupil dilation (mydriasis) is controlled by the sympathetic system; the parasympathetic system produces constriction (miosis).
D. Heart rate decreases: Parasympathetic stimulation via the vagus nerve slows SA node firing, leading to a reduced heart rate.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. SA node (sinoatrial node), AV node (atrio-ventricular node), Bundle of His, Purkinje fibers: This is the normal electrical conduction sequence -SA node generates impulse → brief delay at AV node → impulse travels down Bundle of His and right/left bundle branches to Purkinje fibers for ventricular conduction.
B. AV node, Bundle of His, Purkinje fibers, SA node: This sequence reverses the normal pacemaker order and does not represent physiologic conduction.
C. SA node, Purkinje fibers, Bundle of His, AV node: Purkinje fibers and Bundle of His conduct after the AV node delay; placing Purkinje before Bundle of His and AV node does not reflect actual conduction order.
D. Bundle of His, Purkinje fibers, SA node, AV node: This mixes secondary conduction structures before the primary pacemaker and is not the physiological pathway.
Correct Answer is C
Explanation
A. Neutrophils: White blood cells that engulf and destroy bacteria, not responsible for clotting.
B. Erythrocytes: Red blood cells that carry oxygen, not involved in clotting.
C. Platelets: Small cell fragments essential for hemostasis; they adhere, aggregate, and help form clots when blood vessels are injured.
D. B-cells: Lymphocytes responsible for antibody production, not clotting.
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