Electrocardiography and ECG Recording — NEET Biology
📚 Practice ConceptThe body surface by using electrocardiograph and the recording is called electrocardiogram (ECG) which is of clinical importance.
Which of the above statements are NOT correct? S1: Angina pectoris is a condition characterized by acute chest pain, which is primarily a symptom of reduced oxygen supply to the heart muscle. S2: The occurrence of angina is mostly limited to elderly individuals with pre-existing heart conditions. S3: Heart failure is often called congestive heart failure because of the characteristic congestion of the lungs. S4: The P-wave in an Electrocardiogram (ECG) represents the repolarisation of the ventricles. S5: The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves.
View solution & NCERT explanation
Correct answer: A — S2 and S4
This question tests the understanding of angina, heart failure, and ECG components. S1: Angina is a symptom of acute chest pain appearing when not enough oxygen is reaching the heart muscle. This statement is correct. S2: Angina can occur in men and women of any age but it is more common among the middle-aged and elderly. Thus, stating it is 'mostly limited' to elderly is incorrect. S3: Heart failure is sometimes called congestive heart failure because congestion of the lungs is one of the main symptoms of this disease. This statement is correct. S4: The P-wave represents the electrical excitation (or depolarisation) of the atria. The T-wave represents the repolarisation of the ventricles. Thus, this statement is incorrect. S5: The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves. This statement is correct. Therefore, statements S2 and S4 are NOT correct.
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