Respiration and Circulation MCQ for CET/NEET
Here are the Respiration and Circulation MCQ for CET/NEET questions along with answers and explanations related to the respiratory system:
1. What is the respiratory system?
A. The system responsible for transporting oxygen in the blood
B. The system responsible for exchanging gases between the body and the environment
C. The system responsible for digestion of food
D. The system responsible for regulating body temperature
Answer: B. The system responsible for exchanging gases between the body and the environment
Read: Respiration in Plants
2. Why are the respiratory system and the circulatory system related?
A. They work together to control body temperature
B. They both help in digestion of food
C. They exchange gases between the body and the environment
D. They cooperate to transport oxygen to body cells and remove carbon dioxide
Answer: D. They cooperate to transport oxygen to body cells and remove carbon dioxide
Explanation: The respiratory system provides oxygen to the blood, and the circulatory system transports this oxygenated blood to body cells and removes carbon dioxide.
Read: The Living World
3. Which of the following statements is true about involuntary breathing?
A. It is under conscious control
B. It occurs during exercise
C. It is controlled by the autonomic nervous system
D. It only occurs during sleep
Answer: C. It is controlled by the autonomic nervous system
4. Which gas is released during the process of respiration?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Hydrogen
Answer: C. Carbon dioxide
Explanation: Carbon dioxide is a waste product of cellular respiration and is released into the bloodstream to be exhaled from the body.
5. The exchange of gases between the external environment and the lungs is called ________.
A. Ventilation
B. Gas transport
C. Respiration
D. External respiration
Answer: D. External respiration
6. The maximum volume of air contained in the lung by a full forced inhalation is called _________.
A. Tidal volume
B. Residual volume
C. Inspiratory reserve volume
D. Vital capacity
Answer: D. Vital capacity
7. Which of the following statements is true about the entry of air into the lungs?
A. Air enters the lungs passively due to gravity
B. Air is forced into the lungs by contraction of the diaphragm and intercostal muscles
C. Air is actively sucked into the lungs by the mouth
D. Air enters the lungs due to increased pressure in the alveoli
Answer: B. Air is forced into the lungs by contraction of the diaphragm and intercostal muscles
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8. Which vertebrates have the most well-developed respiratory system?
A. Fish
B. Birds
C. Reptiles
D. Mammals
Answer: B. Birds
Explanation: Birds have a highly efficient respiratory system with air sacs that allow for continuous airflow and efficient gas exchange, making them well-adapted for flight.