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Which one of the following is a matching pair?
- a)Lub - Sharp closure of AV valves at the beginning of ventricular systole
- b)Dup - Sudden opening of semilunar valves at the beginning of ventricular diastole
- c)Pulsation of the radial artery - Valves in the blood vessels
- d)Initiation of the heart beat - Purkinje fibres
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Which one of the following is a matching pair?a)Lub - Sharp closure of...
During ventricular systole, the contraction of ventricular muscles causes the closure of bicuspid and tricuspid valves (AV valves), producing a low pitched 'lubb' sound. At the end of ventricular systole, semilunar valves close, producing the second heart sound, the 'dup'. Pulsation of the radial artery is due to rhythmic contraction and relaxation in the aorta. Initiation of the heart beat occurs in the SA node.
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Most Upvoted Answer
Which one of the following is a matching pair?a)Lub - Sharp closure of...
Lub - Sharp closure of AV valves at the beginning of ventricular systole
The correct answer is option 'A', which states that the sound "Lub" is associated with the sharp closure of AV valves at the beginning of ventricular systole.
Explanation:
The heartbeat consists of two main phases: systole and diastole. Systole refers to the contraction of the heart muscles, while diastole refers to the relaxation of the heart muscles.
- AV valves: The valves responsible for preventing the backflow of blood from the ventricles to the atria are called the atrioventricular (AV) valves. These valves include the tricuspid valve (between the right atrium and right ventricle) and the mitral valve (between the left atrium and left ventricle).
- Lub sound: The "Lub" sound is the first heart sound heard during auscultation with a stethoscope. It is associated with the closure of the AV valves at the beginning of ventricular systole.
- Ventricular systole: Ventricular systole is the phase of the cardiac cycle when the ventricles contract and pump blood out of the heart. During ventricular systole, the pressure inside the ventricles increases, leading to the closure of the AV valves. This closure prevents the backflow of blood from the ventricles to the atria. The closure of the AV valves produces the "Lub" sound.
- Function of AV valves: The AV valves open during ventricular diastole, allowing blood to flow from the atria to the ventricles. They then close during ventricular systole to prevent the backflow of blood. The closure of the AV valves is important for maintaining the direction of blood flow and ensuring efficient pumping of blood by the heart.
Overall, the "Lub" sound is associated with the sharp closure of AV valves at the beginning of ventricular systole. This closure prevents the backflow of blood and ensures the efficient pumping of blood by the heart.
The correct answer is option 'A', which states that the sound "Lub" is associated with the sharp closure of AV valves at the beginning of ventricular systole.
Explanation:
The heartbeat consists of two main phases: systole and diastole. Systole refers to the contraction of the heart muscles, while diastole refers to the relaxation of the heart muscles.
- AV valves: The valves responsible for preventing the backflow of blood from the ventricles to the atria are called the atrioventricular (AV) valves. These valves include the tricuspid valve (between the right atrium and right ventricle) and the mitral valve (between the left atrium and left ventricle).
- Lub sound: The "Lub" sound is the first heart sound heard during auscultation with a stethoscope. It is associated with the closure of the AV valves at the beginning of ventricular systole.
- Ventricular systole: Ventricular systole is the phase of the cardiac cycle when the ventricles contract and pump blood out of the heart. During ventricular systole, the pressure inside the ventricles increases, leading to the closure of the AV valves. This closure prevents the backflow of blood from the ventricles to the atria. The closure of the AV valves produces the "Lub" sound.
- Function of AV valves: The AV valves open during ventricular diastole, allowing blood to flow from the atria to the ventricles. They then close during ventricular systole to prevent the backflow of blood. The closure of the AV valves is important for maintaining the direction of blood flow and ensuring efficient pumping of blood by the heart.
Overall, the "Lub" sound is associated with the sharp closure of AV valves at the beginning of ventricular systole. This closure prevents the backflow of blood and ensures the efficient pumping of blood by the heart.
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Which one of the following is a matching pair?a)Lub - Sharp closure of AV valves at the beginning of ventricular systoleb)Dup - Sudden opening of semilunar valves at the beginning of ventricular diastolec)Pulsation of the radial artery - Valves in the blood vesselsd)Initiation of the heart beat - Purkinje fibresCorrect answer is option 'A'. Can you explain this answer?
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Which one of the following is a matching pair?a)Lub - Sharp closure of AV valves at the beginning of ventricular systoleb)Dup - Sudden opening of semilunar valves at the beginning of ventricular diastolec)Pulsation of the radial artery - Valves in the blood vesselsd)Initiation of the heart beat - Purkinje fibresCorrect answer is option 'A'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which one of the following is a matching pair?a)Lub - Sharp closure of AV valves at the beginning of ventricular systoleb)Dup - Sudden opening of semilunar valves at the beginning of ventricular diastolec)Pulsation of the radial artery - Valves in the blood vesselsd)Initiation of the heart beat - Purkinje fibresCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following is a matching pair?a)Lub - Sharp closure of AV valves at the beginning of ventricular systoleb)Dup - Sudden opening of semilunar valves at the beginning of ventricular diastolec)Pulsation of the radial artery - Valves in the blood vesselsd)Initiation of the heart beat - Purkinje fibresCorrect answer is option 'A'. Can you explain this answer?.
Which one of the following is a matching pair?a)Lub - Sharp closure of AV valves at the beginning of ventricular systoleb)Dup - Sudden opening of semilunar valves at the beginning of ventricular diastolec)Pulsation of the radial artery - Valves in the blood vesselsd)Initiation of the heart beat - Purkinje fibresCorrect answer is option 'A'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which one of the following is a matching pair?a)Lub - Sharp closure of AV valves at the beginning of ventricular systoleb)Dup - Sudden opening of semilunar valves at the beginning of ventricular diastolec)Pulsation of the radial artery - Valves in the blood vesselsd)Initiation of the heart beat - Purkinje fibresCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following is a matching pair?a)Lub - Sharp closure of AV valves at the beginning of ventricular systoleb)Dup - Sudden opening of semilunar valves at the beginning of ventricular diastolec)Pulsation of the radial artery - Valves in the blood vesselsd)Initiation of the heart beat - Purkinje fibresCorrect answer is option 'A'. Can you explain this answer?.
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