Which of the following is a catecholamine mentioned as increasing muscle contraction, energy, and blood pressure?

Which of the following is a catecholamine mentioned as increasing muscle contraction, energy, and blood pressure?

• A. Dopamine
• B. Serotonin
• C. Insulin
• D. Cortisol

Answer: (A)

Catecholamines are adrenaline-like signals that prepare the body for quick action. They’re derived from tyrosine and include dopamine, norepinephrine, and epinephrine. These substances ramp up the systems that increase muscle activity, energy availability, and blood pressure: they boost heart rate and the force of heart contractions, raise vascular tone to raise blood pressure, and promote glycogen and fat breakdown to free up energy for use. Among the options, only dopamine is a catecholamine, so it’s the one that fits this description. Serotonin is an indoleamine, not a catecholamine; insulin is a peptide hormone that lowers blood glucose, and cortisol is a steroid hormone involved in stress responses, not a catecholamine.

Catecholamines are adrenaline-like signals that prepare the body for quick action. They’re derived from tyrosine and include dopamine, norepinephrine, and epinephrine. These substances ramp up the systems that increase muscle activity, energy availability, and blood pressure: they boost heart rate and the force of heart contractions, raise vascular tone to raise blood pressure, and promote glycogen and fat breakdown to free up energy for use. Among the options, only dopamine is a catecholamine, so it’s the one that fits this description. Serotonin is an indoleamine, not a catecholamine; insulin is a peptide hormone that lowers blood glucose, and cortisol is a steroid hormone involved in stress responses, not a catecholamine.