Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET2004ZoologyBreathing and Exchange of GasesActual

CO is harmful to human being because

Options

  1. Ait decreases CO ₂ concentration
  2. Bit competes O ₂ to combine with haemoglobin
  3. Cit is carcinogenic
  4. Dit depletes O ₃ layer

Correct answer

B. it competes O ₂ to combine with haemoglobin

Step-by-step solution

Haemoglobin forms a stable compound with CO. The affinity of haemoglobin for CO is 200 times more than for O ₂ so even 0.1 % CO blocks 50 % haemoglobin of the body due to which oxygen carrying capacity of blood is decreased. This is called hypoxia.

Practice Breathing and Exchange of Gases on Quantrex Academy →

More from Breathing and Exchange of Gases

Match List I with List II : List I (Respiratory Volume) List II (Capacity in mL) A. ERV (Expiratory Reserve Volume) I. 2500 - 3000 mL B. RV (Residual Volume) II. 500 mL C. IRV (Ins 2026In humans, respiration occurs in the following steps. Arrange these steps in the correct order. A. Diffusion of O ₂ and CO ₂ between blood and tissues. B. Diffusion of O ₂ and CO ₂ 2026Sponges exchange O₂ with CO₂ by __________. 2026In water, frogs respire using __________. 2026Frogs respire in water by skin and buccal cavity and on land by skin, buccal cavity and lungs. Choose the correct answer from the following : 2025Match List-I with List-II. array |l|l|l|l| & List - I & & List - II A . & Emphysema & (i) & Rapid spasms in muscle due to low Ca ⁺⁺ in body fluid B. & Angina pectoris & (ii) & Dama 2025Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: During the transportation of gases, about 20-25 percent of CO ₂ i 2024Match List I with List II : Choose the correct answer from the options given below : 2024 Full Breathing and Exchange of Gases list All NEET PYQs