NEET Biology: Respiratory organs in animals Practice Questions
15 free multiple-choice questions on Respiratory organs in animals (Human Physiology) for NEET Biology, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. Which muscle plays the most crucial role in the process of breathing (ventilation)?
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Correct answer: C — Diaphragm
The diaphragm is the primary muscle responsible for inhalation, as its contraction causes it to move downward, increasing the volume of the thoracic cavity.
Q2. The structure present in the lungs that is highly vascularized and provides a large surface area for gas exchange is the:
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Correct answer: D — Alveoli
Alveoli are the microscopic air sacs where diffusion of oxygen into the blood and carbon dioxide out of the blood takes place.
Q3. Which part of the respiratory tract is known as the conducting zone?
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Correct answer: C — Bronchi and bronchioles
The conducting zone includes the nose, pharynx, larynx, trachea, bronchi, and bronchioles, which guide air to the lungs.
Q4. Which type of tissue forms the walls of the alveoli?
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Correct answer: B — Simple squamous epithelium
The walls of the alveoli are composed of simple squamous epithelium, which facilitates rapid diffusion of gases.
Q5. Which structure forms the primary site for the exchange of respiratory gases in the lungs?
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Correct answer: A — Alveoli
Alveoli are microscopic air sacs where the actual exchange of oxygen and carbon dioxide between the inhaled air and the blood occurs.
Q6. The tubes that carry air from the trachea into the lungs are known as:
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Correct answer: A — Bronchi
The bronchi branch out from the trachea to enter the lungs, which is the main pathway for air delivery.
Q7. Which muscle plays the most important role in the process of breathing (ventilation)?
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Correct answer: C — Diaphragm
The diaphragm is the principal muscle responsible for the mechanical movement of breathing, as it changes the volume of the thoracic cavity.
Q8. The process of air entering the lungs is primarily driven by the contraction of which muscle?
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Correct answer: C — Diaphragm
The diaphragm is the principal muscle responsible for inhalation, as its contraction increases the volume of the thoracic cavity, drawing air into the lungs.
Q9. Which part of the respiratory tract is responsible for conducting air to the lungs?
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Correct answer: B — Trachea
The trachea (windpipe) is the main tube that carries air from the larynx down to the bronchi, conducting it to the lungs.
Q10. Which of the following gases is primarily transported in the blood via the pulmonary circulation?
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Correct answer: A — Oxygen
Oxygen is the gas taken in from the lungs and is transported via the blood to the rest of the body tissues.
Q11. Which structure in the human respiratory system is primarily responsible for the exchange of respiratory gases (oxygen and carbon dioxide)?
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Correct answer: C — Alveoli
The alveoli are microscopic air sacs located at the end of the bronchioles. This site is where external respiration—the exchange of oxygen into the blood and carbon dioxide out of the blood—occurs.
Q12. What is the primary role of the trachea in the respiratory system?
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Correct answer: B — To serve as the main airway for air passage to the lungs
The trachea (windpipe) serves as the main conduit for air, carrying it from the larynx down to the bronchi, which lead into the lungs, thus facilitating air passage.
Q13. Which part of the respiratory system is primarily responsible for the exchange of oxygen and carbon dioxide with the blood?
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Correct answer: A — Alveoli
The alveoli are tiny air sacs where the actual diffusion of gases (oxygen into the blood and carbon dioxide out of the blood) occurs.
Q14. Which muscle is the principal muscle involved in the process of breathing?
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Correct answer: C — Diaphragm
The diaphragm is the most important muscle for breathing, as its contraction and relaxation change the volume of the thoracic cavity, thereby causing inhalation and exhalation.
Q15. Which type of respiration involves the exchange of gases directly between the air and the blood in the alveoli?
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Correct answer: A — External respiration
External respiration refers to the exchange of gases between the atmosphere and the blood in the lungs.
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