Question

In: Anatomy and Physiology

1. Which of these answers are correct The first heart sound, "lubb," is caused by the...

1. Which of these answers are correct

The first heart sound, "lubb," is caused by the ________.

closing of the atrioventricular valves

closing of the semilunar valves

regurgitation of the atrioventricular valves

blood flowing into the ventricles

2. Choose the right answer:

The plateau phase of the ventricular action potential is caused by _______.

slow K⁺ channels opening

fast Na⁺ channels opening

fast voltage-gated Ca²⁺ channels opening

slow voltage-gated Ca²⁺ channels opening

3.. How is heart rate controlled?

Parasympathetic and sympathetic divisions of the ANS control heart rate.

Heart rate is controlled through the cardiac plexus.

Dual innervation controls the heart rate.

All the listed answers are correct.

Expert Solution

1.Correct answer is option A - closure of atrioventricular valves.

Explanation :

First heart sound - Lubb is due to closure of atrioventricular valves.

Second heart sound - Dubb is due to closure of semilunar valves.

2.Right option is - opening of voltage gated slow calcium channels

Expalnation :

Plateau phase is due to opening of voltage gated slow calcium channels.

Depolarisation phase is due to opening of voltage gated fast sodium channels

Repolarisation is due to opening of voltage gated potassium channels and closing of calcium channels

3.Right option is - all the above

Expalnation :

All options are indicating same thing - Heart rate is controlled by sympathetic and parasympathetic divisions of ANS.

Dual nerve supply indicates - sympathetic and parasympathetic supply

Cardiac plexus -plexus of nerves seen at the base of heart. They are branches of parasympathetic and synthetic system.

Sympathetic system increase heart rate and parasympathetic system decrease heart rate.

Sydney Mullin answered 1 year ago

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