SarkariPYQ

SSC CHSL 2025 PYQ — Question 98

SSC CHSL - 17 Nov 2025 - Shift 2 • General Awareness • Q98

Back to paper

Carbon dioxide is transported to the lungs from all parts of the body through _____ in humans.

Show answer & explanation

Correct answer: C

Explanation

The correct answer is Option 3: Blood.
Explanation:
During the process of respiration in the human body, carbon dioxide (CO2) generated within the cells is transported back to the lungs via the blood. Since CO2 is more soluble in water than oxygen, it is transported more easily by dissolving in the blood.

CO2 is transported by the blood in three forms:

  • As Bicarbonate (approximately 70%): The majority of CO2 travels dissolved in the blood plasma as bicarbonate ions.
  • As Carbamino-hemoglobin (approximately 20–25%): A certain amount of CO2 travels bound to the hemoglobin within red blood cells (RBCs).
  • Dissolved in Plasma (approximately 7%): A very small amount of CO2 is transported directly, dissolved in the plasma.
  • Key Points Related to Respiration and Circulation (Quick Revision):
  • As you prepare for General Science (Biology) for the SSC, RRB, and other competitive examinations, these facts are highly important:
  • Oxygen Transport: Primarily carried out by hemoglobin.
  • Gas Exchange: Occurs in the air sacs (Alveoli) of the lungs, where the blood releases CO2 and absorbs O2.
  • Veins: Carry impure blood (rich in CO2) from the body's organs toward the heart.
  • Arteries: Carry pure blood (rich in O2) from the heart toward the body's organs.

Important Questions for Upcoming Examinations:
Question: Which disease is caused by a deficiency of hemoglobin?
Answer: Anemia.
Question: Which cells help in the clotting of blood?
Answer: Platelets. Question: How many chambers does the human heart have?
Answer: 4 chambers.