Certified Emergency Nurse (CEN) Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

In a physiological context, what does vasoconstriction primarily result from?

Activation of the parasympathetic nervous system

Increased sympathetic nervous system activity

Vasoconstriction primarily results from increased activity of the sympathetic nervous system. When the sympathetic nervous system is activated, it releases norepinephrine, which binds to alpha-adrenergic receptors on the smooth muscle cells of blood vessels. This binding causes the muscles to contract, leading to a narrowing of the blood vessels, or vasoconstriction. This physiological response is crucial in various situations, such as helping to maintain blood pressure during times of stress or injury.

The sympathetic nervous system’s role in promoting vasoconstriction is essential for managing blood flow and ensuring vital organs receive adequate blood supply, especially under conditions like shock or hemorrhage. Understanding this relationship helps in assessing and managing patients who may present with altered vascular status in an emergency setting.

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Inhibition of beta one receptors

Blockage of vascular receptors

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