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Read the following statements (i) The...

Read the following statements
(i) The nodal musculature of the heart has the ability to generate action potentials without any external stimuli.
(ii) The AV node is located in the right ventricle close to the AV septum
(iii) The stroke volume is the amount of blood pumped out by each ventricle per minute.
Which of these are correct ?

A

(i) , & (ii)

B

(ii) & (iii)

C

only (ii)

D

only (i)

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statements about the heart are correct, we will analyze each statement one by one. ### Step-by-Step Solution: 1. **Analyzing Statement (i)**: - The statement claims that the nodal musculature of the heart can generate action potentials without any external stimuli. - This is true. The heart's nodal tissues, particularly the sinoatrial (SA) node, have intrinsic rhythmicity, meaning they can generate electrical impulses independently. **Hint**: Remember that the SA node is known as the natural pacemaker of the heart. 2. **Analyzing Statement (ii)**: - The statement claims that the AV node is located in the right ventricle close to the AV septum. - This is false. The atrioventricular (AV) node is actually located at the junction of the atria and ventricles, specifically in the right atrium, near the interatrial septum. **Hint**: Recall the anatomical position of the AV node in relation to the atria and ventricles. 3. **Analyzing Statement (iii)**: - The statement claims that stroke volume is the amount of blood pumped out by each ventricle per minute. - This is false. Stroke volume refers to the amount of blood pumped out by each ventricle per heartbeat, not per minute. The cardiac output is the term used for blood pumped per minute, which is the product of stroke volume and heart rate. **Hint**: Differentiate between stroke volume and cardiac output based on their definitions. ### Conclusion: - After analyzing all three statements: - Statement (i) is correct. - Statement (ii) is incorrect. - Statement (iii) is incorrect. Thus, the only correct statement is (i). ### Final Answer: The correct statement is (i) only.
To determine which statements about the heart are correct, we will analyze each statement one by one. ### Step-by-Step Solution: 1. **Analyzing Statement (i)**: - The statement claims that the nodal musculature of the heart can generate action potentials without any external stimuli. - This is true. The heart's nodal tissues, particularly the sinoatrial (SA) node, have intrinsic rhythmicity, meaning they can generate electrical impulses independently. ...
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