What is the correct sequence of the following in a heart attack ? I. > Narrowing of the inner orifice of the vessel II. > Plaque from fibrous tissue and high cholesterol III. > Inadequate supply of blood and oxygen IV. > Clots of blood carried into the co

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Q: 104 (IAS/1994)
What is the correct sequence of the following in a heart attack ?
I. Narrowing of the inner orifice of the vessel
II. ‘Plaque’ from fibrous tissue and high cholesterol
III. Inadequate supply of blood and oxygen
IV. Clots of blood carried into the coronary arteries. Choose the answer from the codes given below :

question_subject: 

Science

question_exam: 

IAS

stats: 

0,48,85,35,48,29,21

keywords: 

{'heart attack': [3, 0, 0, 0], 'coronary arteries': [0, 2, 0, 0], 'iv': [6, 110, 77, 8], 'clots': [0, 1, 0, 0], 'plaque': [0, 1, 0, 0], 'blood': [5, 0, 0, 1], 'inner orifice': [0, 1, 0, 0]}

The process of development of a heart attack involves four main stages. The correct sequence of these stages is represented in option 2.

II. `Plaque` from fibrous tissue and high cholesterol: This is the initial stage where plaques, a combination of cholesterol and other substances, begin to develop in the heart arteries leading to atherosclerosis.

IV. Clots of blood carried into the coronary arteries: The next step after plaque formation is the formation of blood clots. These clots may be carried into the coronary arteries where they can disrupt the blood flow.

I. Narrowing of the inner orifice of the vessel: After the plaque and blood clot development, the arteries start to narrow and harden. This leads to reduced blood flow called ischemia.

III. Inadequate supply of blood and oxygen: Lastly, this reduced blood flow can result in inadequate supply of blood and oxygen to the heart muscle causing heart attack or myocardial infarction.

So, the correct order of the sequence is II, IV, I, III.

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