A large proportion of oxygen is left unused in the human blood even after its uptakes by the body tissues. This $O _{2}$ :
- acts as a reserve during muscular exercise
- raises the $PCO_2$ of blood to $75 \,mm$ of $Hg$
- is enough to keep oxyhaemoglobin saturation at $96\%$
- helps in releasing more $O_2$ to the epithelial tissues
The Correct Option is A
Approach Solution - 1
Approach Solution -2
Explanation:
- Hemoglobin facilitates the transportation of oxygen, with a small quantity also dissolved in the plasma. While approximately 25% of oxygen is utilized by cells, the remaining 75% remains unused.
- This surplus oxygen serves as a reserve, particularly evident during muscular exercise. Normal blood carbon dioxide partial pressure ranges between 35 and 45 mmHg, with higher values indicating respiratory acidosis and hypoventilation.
- Various factors, including temperature, pH, alternate forms of hemoglobin, carbon dioxide partial pressure, and the concentration of 2,3-diphosphoglycerate (2,3-DPG) in red blood cells, influence the saturation of oxyhemoglobin and the dissociation of oxygen from hemoglobin.
Top Questions on Exchange Of Gases
Which of the following statements about the pharynx and larynx is/are correct?
(1) The pharynx serves as a pathway for both food and air.
(2) The larynx is involved in the production of sound.
(3) The pharynx contains the vocal cords.
(4) The larynx prevents food from entering the trachea.
Choose the correct options from the given below:- MHT CET - 2024
- Biology
- Exchange Of Gases
- Under normal physical conditions in human beings every 100 ml oxygenated blood can deliver____ml of O2 to the tissues.
- NEET (UG) - 2023
- Biology
- Exchange Of Gases
- Given below are two statements:
Statement I: Greenhouse gases are increasing due to industrial development, exponential increase in energy production and use
Statement II: Increase in the concentration of greenhouse gases is directly dependent upon anthropogenic activities.
In the light of the above statements, choose the most appropriate answer from the options given below- CUET (PG) - 2023
- Agroforestry
- Exchange Of Gases
- Which of the following is not the function of the conducting part of the respiratory system?
- NEET (UG) - 2022
- Biology
- Exchange Of Gases
- The partial pressures (in mm Hg) of oxygen (O2 ) and carbon dioxide (CO2 ) at alveoli (the site of diffusion) are
- NEET (UG) - 2021
- Biology
- Exchange Of Gases
Questions Asked in NEET exam
- Two gases A and B are filled at the same pressure in separate cylinders with movable pistons of radii \(r_A\) and \(r_B\) respectively. On supplying an equal amount of heat to both the cylinders, their pressures remain constant and their pistons are displaced by 16 cm and 9 cm respectively. If the change in their internal energies is the same, then the ratio \(r_A / r_B\) is:
- NEET (UG) - 2025
- Thermodynamics
- Given below are two statements:
Statement I: Fig fruit is a non-vegetarian fruit as it has enclosed fig wasps in it.
Statement II: Fig wasp and fig tree exhibit a mutual relationship as the fig wasp completes its life cycle in the fig fruit and the fig fruit gets pollinated by the fig wasp. - Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus.
Reason (R): Presence of more than one nucleus in the tapetum increases the efficiency of nourishing the developing microspore mother cells.- NEET (UG) - 2025
- Reproduction in Plants
A constant voltage of 50 V is maintained between the points A and B of the circuit shown in the figure. The current through the branch CD of the circuit is :
- NEET (UG) - 2025
- Current electricity
A bob of heavy mass \(m\) is suspended by a light string of length \(l\). The bob is given a horizontal velocity \(v_0\) as shown in figure. If the string gets slack at some point P making an angle \( \theta \) from the horizontal, the ratio of the speed \(v\) of the bob at point P to its initial speed \(v_0\) is :
- NEET (UG) - 2025
- Pendulums
Concepts Used:
Breathing and Exchange of Gases
A metabolic process, which is carried out by all living organisms including plants, animals, and humans for the production of energy and to stay alive is Respiration. Except for required anaerobes, every other organism from amoeba to humans needs oxygen for survival. And evolution has reported a number of systems that allows the exchange of gases in organisms.
There are two types of respiration such as;
- Aerobic respiration — to produce energy, it occurs in the presence of oxygen
- Anaerobic respiration — to produce energy, occurs in the absence of oxygen
Breathing can be simply derived as the process of inhaling oxygen gas from the atmosphere and exhaling the carbon dioxide gas back into the atmosphere is termed breathing and the process is commonly known as respiration.
Read More: Breathing and Exchange of Gases