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Right to Education (RTE Act 2009)
Asked 3 months ago · Viewed 4,494 times
हिन्दी English

With reference to the circulatory system of the human body and the process of blood circulation, consider the following statements:

  1. 1. The human heart is a muscular organ that exhibits double circulation, in which oxygenated and deoxygenated blood do not mix because the heart is divided into four chambers (two atria and two ventricles).
  2. 2. The oxygenated blood emerging from the aorta first enters the right atrium and is sent from there to the right ventricle via the tricuspid valve.
  3. 3. The pulmonary artery is the only artery that carries deoxygenated blood from the right ventricle of the heart to the lungs for oxygenation.
  4. 4. A sphygmomanometer is used to measure blood pressure, in which the systolic pressure of a normal healthy human is about 120 mm Hg and the diastolic pressure is about 80 mm Hg.

Which of the above statement(s) is/are completely true?

Detailed Explanation

Detailed Explanation

The circulatory system is a vital topic under human physiology in child development and pedagogy science curricula. Let us analyze each statement:

  • Statement 1 is correct: The human heart is four-chambered and exhibits double circulation, ensuring that oxygenated and deoxygenated blood do not mix.
  • Statement 2 is incorrect: Oxygenated blood from the lungs first enters the left atrium (not the right atrium) before moving to the left ventricle.
  • Statement 3 is correct: The pulmonary artery uniquely carries deoxygenated blood from the right ventricle to the lungs for purification.
  • Statement 4 is correct: Blood pressure is measured using a sphygmomanometer, with a normal reading of approximately 120/80 mm Hg (systolic/diastolic).

Therefore, statements 1, 3, and 4 are completely true.

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