Y1S2 003 II Pharmacology Autonomic Nervous System: Regulation of Heart Rate and Blood Pressure

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What is the effect of low dose epinephrine on blood pressure?

Decreases blood pressure (correct)
Increases blood pressure
Initially increases and then decreases blood pressure
Has no effect on blood pressure

Which receptors are mainly responsible for the vasoconstriction effect of epinephrine?

β1 receptors
α1 receptors (correct)
β2 receptors
α2 receptors

What is the effect of epinephrine on the heart rate?

Increases heart rate at high doses and decreases at low doses
Increases heart rate at low doses and decreases at high doses (correct)
Always decreases heart rate
Always increases heart rate

What is the effect of epinephrine on the bronchial muscles?

Relaxation (D) Signup and view all the answers

What is the effect of epinephrine on blood sugar levels?

Increases blood sugar levels (C) Signup and view all the answers

What is one of the clinical uses of epinephrine?

Nasal decongestion (D) Signup and view all the answers

What is the effect of M3 receptors on blood vessels?

VASODILATION (C) Signup and view all the answers

What is the effect of acetylcholine on heart rate and force of cardiac contraction?

Decreased heart rate and contraction force (D) Signup and view all the answers

What is the therapeutic use of acetylcholine in ophthalmic surgery?

As a mitotic agent (C) Signup and view all the answers

What is the effect of atropine on the vagal nerve on the heart?

Block effects of vagal nerve on heart (D) Signup and view all the answers

What is the duration of action of acetylcholine?

Short duration (C) Signup and view all the answers

What is the effect of acetylcholine on the coronary blood flow when injected into the coronary artery?

Dramatic decrease in coronary blood flow (D) Signup and view all the answers

What is the primary function of the autonomic nervous system?

To regulate heart rate and blood pressure (A) Signup and view all the answers

What is the primary neurotransmitter released by the sympathetic nervous system?

Norepinephrine (A) Signup and view all the answers

What is the type of adrenergic receptor that has a primary effect on the heart?

β1 (B) Signup and view all the answers

What is the type of response elicited by the sympathetic nervous system?

Fight or flight response (D) Signup and view all the answers

What is the effect of epinephrine on the body?

Increases heart rate and blood pressure (B) Signup and view all the answers

What is the primary function of the parasympathetic nervous system?

To promote digestion and relaxation (D) Signup and view all the answers

What is the effect of norepinephrine on blood vessels?

Vasoconstriction (D) Signup and view all the answers

What is the primary receptor affected by norepinephrine in blood vessels?

Alpha-1 (D) Signup and view all the answers

What is the effect of norepinephrine on heart rate?

Increases heart rate (C) Signup and view all the answers

What is the therapeutic use of norepinephrine?

Hypovolemic shock (C) Signup and view all the answers

What is the enzyme responsible for metabolizing norepinephrine?

Monoamine Oxidase (MAO) (A) Signup and view all the answers

What is the effect of propranolol on heart rate?

Decreases heart rate (B) Signup and view all the answers

What is the therapeutic use of propranolol?

Hypertension (B) Signup and view all the answers

What is the neurotransmitter released by the parasympathetic nervous system?

Acetylcholine (B) Signup and view all the answers

What is the subtype of muscarinic receptor mainly found on the heart?

M2 (A) Signup and view all the answers

What is the role of the parasympathetic nervous system in controlling blood vessels?

Has no effect on blood vessels (A) Signup and view all the answers