_ is sometimes given by injection as an emergency treatment in cardiac arrest.
Correct answer: D. Epinephrine
- A. Acetylcholine
- B. Dopamine
- C. Serotonin
- D. Epinephrine
Explanation
When CPR does not generate coronary perfusion of more than 15-20 mmHg, return of spontaneous circulation (ROSC) rarely or never occurs. After more than a few minutes of cardiac arrest, arterial tone collapses, and epinephrine or another vasoconstrictor is essential for restoration of cardiac activity.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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