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

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Medical Sciences

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 atrioventricularvalves
blood flowing into the ventricles
2. Choose the right answer:
The plateau phase of the ventricular action potential iscaused by _.
slow K⁺ channels opening
fast Na⁺ channels opening
fast voltage-gated Ca²⁺ channelsopening
slow voltage-gated Ca²⁺ channelsopening
3.. How is heart rate controlled?
Parasympathetic and sympathetic divisions of the ANScontrol heart rate.
Heart rate is controlled through the cardiacplexus.
Dual innervation controls the heart rate.
All the listed answers are correct.

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1Correct 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 See Answer

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