Free Respiration MCQs with Answers
446 Respiration MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The human respiratory system includes the air passages, lungs, alveoli and breathing muscles, while gaseous exchange explains how oxygen enters blood and carbon dioxide leaves it by diffusion. The effects of smoking include damage to cilia and alveoli, reduced gas exchange, chronic bronchitis, emphysema and increased risk of lung cancer.
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Read the Respiration notesFree MDCAT chapter notes with key terms446 questions · page 15 of 23
- A. 2000 kcal
- B. 1000 kcal
- C. 750 kcal
- D. 2800 kcal.
Explanation: A: An average person not doing hard work requires energy per day about 2000 kcal: This statement is accurate.
Correct answer: 2000 kcal- A. Spleen
- B. Liver
- C. Gill
- D. Lung
Explanation: All options are explained below. Option A is correct. a)Spleen: The spleen is a vital organ in the vertebrate circulatory system which…
Correct answer: Spleen- A. With the help of WBCs and blood serum
- B. With the help of platelets and corpuscles
- C. With the help of RBCs and blood plasma
- D. With the help of RBCs and WBCs
Explanation: All options are explained below: a)With the help of WBCs and blood serum: White blood cells (WBCs) primarily play a role in the immune…
Correct answer: With the help of RBCs and blood plasma- A. Increase in number
- B. Decrease in number
- C. Increase in size
- D. Decrease in size
Explanation: All options are explained below: a)Increase in number (Correct Option): This statement is accurate.
Correct answer: Increase in number- A. CO2 is continuously diffused through the tissues and is not allowed to accumulate
- B. In CO2 transport, blood buffers play an important role
- C. CO2 is absorbed by the leucocytes
- D. CO2 combines with water to form H2CO3 which is neutralized by NaCO3 .
Explanation: All options are explained below: a)CO2 is continuously diffused through the tissues and is not allowed to accumulate:This statement is not…
Correct answer: In CO2 transport, blood buffers play an important role- A. In combination with haemoglobin only
- B. Dissolved in blood plasma
- C. In the form of bicarbonate ions
- D. As carbaminohaemoglobin and as carbonic acid
Explanation: All options are explained below: a)in combination with haemoglobin only:This statement is not entirely accurate.
Correct answer: In the form of bicarbonate ions- A. Muscular walls of lung
- B. Diaphragm
- C. Costal muscles
- D. Both (b) and (c).
Explanation: All options are explained below: a) Muscular walls of lung: The walls of the lungs themselves do not play a direct role in governing…
Correct answer: Both (b) and (c).- A. Cerebellum
- B. Medulla oblongata
- C. Cerebral peduncle
- D. The vagus nerve.
Explanation: All options are explained below: a)Cerebellum:The cerebellum is primarily responsible for coordinating motor movements, balance, and…
Correct answer: Medulla oblongata- A. Plasma and Erythrocytes
- B. Plasma
- C. Erythrocytes
- D. Erythrocytes and Leucocytes.
Explanation: All options are explained below: a) plasma and erythrocytes : In this option, it is suggested that carbon dioxide is transported from…
Correct answer: Plasma and Erythrocytes- A. Humans
- B. Frog
- C. Rabbit
- D. Lizard.
Explanation: All options are explained below: a) Humans: In humans, the skin can play a limited role in respiration, but it is not considered an…
Correct answer: Frog- A. Lymphocytes
- B. Blood Plasma
- C. RBC
- D. Leucocytes
Explanation: Therefore, the correct answer to the question "Carbonic anhydrase occurs in" is C) RBC (Red Blood Cells).
Correct answer: RBC- A. 10000
- B. 12000
- C. 15000
- D. 20000
Explanation: 12,000 stomata per square cm are present on the leaf surface in Tobacco plants.
Correct answer: 12000- A. Respiratory exchange
- B. Breathing
- C. Diffusion
- D. Osmosis
Explanation: "The explanation for this question will be added soon!".
Correct answer: Breathing- A. Glottis
- B. Voice-box
- C. Bronchi
- D. Both A and B
Explanation: "The explanation for this question will be added soon!".
Correct answer: Both A and B- A. Brain
- B. Heart
- C. Kidneys
- D. Lungs
Explanation: "The explanation for this question will be added soon!".
Correct answer: Lungs- A. Glottis
- B. Vocal cords
- C. Larynx
- D. Epiglottis
Explanation: "The explanation for this question will be added soon!".
Correct answer: Epiglottis- A. Bronchi
- B. Alveoli
- C. Terminal bronchiole
- D. Respiratory bronchiole
Explanation: "The explanation for this question will be added soon!".
Correct answer: Alveoli- A. Decreased
- B. Increased
- C. Remains same
- D. First increased then decreased
Explanation: "The explanation for this question will be added soon!".
Correct answer: Increased- A. They are opened sacs
- B. They are closed sacs
- C. They are spongy in nature
- D. They are placed in chest cavity
Explanation: "The explanation for this question will be added soon!".
Correct answer: They are opened sacs- A. CO2
- B. Temperature
- C. pH of blood
- D. All of the above
Explanation: "The explanation for this question will be added soon!".
Correct answer: All of the above