Free Respiration MCQs with Answers

• A. Blood buffer
• B. Neutralization of H2CO3by Na2CO3
• C. Absorption by leukocytes
• D. Non-occumulation

Explanation: The bicarbonate buffering system of blood is an important buffer system in the acid-base homeostasis of living things, including humans.

• A. Histoplasmosis
• B. Tuberculosis
• C. Cystic Fibrosis
• D. Pneumonia

Explanation: The correct answer is Cystic Fibrosis. Unlike histoplasmosis, tuberculosis, and pneumonia, which are infections caused by a fungus…

• A. 50 times
• B. 20 times
• C. 70 times
• D. 100 times

Explanation: Hemoglobin significantly enhances the oxygen-carrying capacity of blood by approximately 70 times compared to plasma.

• A. Cigarette smoking reduces inflammation of the bronchi
• B. Neural signals from pneumotaxic centre in pons region of brain can increase the duration of inspiration
• C. Asthma is a condition in which your airways narrow and swell and may produce extra mucus
• D. About 90% of carbon dioxide (CO2) is carried by haemoglobin as carbamino­haemoglobin

Explanation: Asthma involves the narrowing and swelling of airways and increased mucus production, which can lead to breathing difficulties.

• A. Acts as a reserve during muscular exercise
• B. Raises the pCO2 of blood to 75 mmHg
• C. Is enough to keep oxyhaemoglobin saturation at 96%
• D. Helps in releasing more O2 to the epithelial tissues

Explanation: The unused oxygen in the blood acts as a reserve, which can be utilized during physical activities such as exercise when the body's oxygen…

• A. Has only 2 protein subunits instead of 4
• B. Has a higher affinity for oxygen than that of an adult
• C. Has a lower affinity for oxygen than that of the adult
• D. Its affinity for oxygen is the same as that of an adult.

Explanation: .Fetal hemoglobin has a higher affinity for oxygen compared to adult hemoglobin.

• A. Inspired air contains more O2 than exhaled air:
• B. Expired air has 100 times greater CO2 as inspired air
• C. Amount of N2 is equal in both inhaled and exhaled air
• D. Exhaled air is comparatively drier than inhaled air

Explanation: Exhaled air has saturated water contents as compared to inhaled air which has variable water contents.

• A. The Johnson were not wealthy.
• B. The Johnsons were not wealthy.
• C. Johnsons were not wealthy.
• D. The Johnsons was not wealthy.

Explanation: The sentence is structured correctly, using the plural form "The Johnsons" with the verb "were".

• A. 2
• B. 5
• C. 8
• D. More than 10

Explanation: Option A: There are more than 2 compounds in tar that are involved in causing cancer. The actual number is higher.

• A. Both of them follows
• B. None of them follows
• C. Only b follows
• D. Only a follows

Explanation: Statement a) "He will feel restlessness and anxiety" follows as quitting smoking can lead to withdrawal symptoms such as restlessness and…

• A. Asthma
• B. Tuberculosis
• C. Emphysema
• D. Both Options A and B are correct

Explanation: Emphysema is a lung condition that causes shortness of breath. In people with emphysema, the air sacs in the lungs (alveoli) are damaged.

• A. O2
• B. CO2
• C. CO
• D. H2

Explanation: The Bohr effect describes hemoglobin's lower affinity for oxygen secondary to increases in the partial pressure of carbon dioxide and/or…

• A. Blood buffer
• B. Neutralization of H2CO3 by Na2CO3
• C. Absorption by leukocytes
• D. Non-accumulation

Explanation: During the transport of carbon dioxide, the blood does not become acidic due to the presence of buffering systems in the blood.When carbon…

• A. Blood buffer
• B. Neutralization of H2CO3 by Na2CO3
• C. Absorption by leukocytes
• D. Non-accumulation

Explanation: Option A: Although much COz is carried-in blood, blood does not become acidic.

• A. 15 ml/100 ml of blood
• B. 19.6 ml/100 ml of blood
• C. 20.1 ml/100 ml of blood
• D. 200 ml/100 ml of blood

Explanation: In 100 ml of blood, there is about 15 g of Hb, so 100 ml of blood has the capacity to bind 19.6ml of oxygen.

• A. Globin
• B. Myoglobin
• C. Myoglycogen
• D. Glycogen

Explanation: Myoglobin is found in skeletal muscles consisting of one polypeptide chain with each molecule containing one iron-containing haem group.

• A. Smooth muscle cells
• B. Goblet cells
• C. Alveoli
• D. Epithelial cells
• E. Pleural cells

Explanation: Explanation for this question will be added soon.

• A. Internal intercostal muscles contract
• B. External intercostal muscles relax
• C. Diaphragm relaxes
• D. Occurs due to increased pressure in thoracic cavity
• E. External intercostal muscles contract

Explanation: Explanation for this question will be added soon.

• A. Larynx
• B. Trachea
• C. Bronchioles
• D. Bronchi

Explanation: Terminal Bronchioles is the last part of the conducting portion of the respiratory system, and has the smallest diameter of all (less than…

• A. 6 to 10 times per minute
• B. 10 to 14 times per minute
• C. 12 to 16 times per minute
• D. 15 to 20 times per minute

Explanation: Normal breathing rates for an adult person at rest range from 12 to 16 breaths per minute.