CBSE-XI-Biology
17: Breathing and Exchange of Gases
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- #13-aIRV and ERVAns :
Inspiratory reserve volume
(IRV)
Expiratory reserve volume (ERV)
1. It is the maximum volume of air that can be inhaled after a normal inspiration.
2. It is about 2500 - 3500 mL in the human lungs.
1. It is the maximum volume of air that can be exhaled after a normal expiration.
2. It is about 1000 - 1100 mL in the human lungs.
- #13-bInspiratory capacity and Expiratory capacityAns :
Inspiratory capacity
(IC)
Expiratory capacity
(EC)
1. It is the volume of air that can be inhaled after a normal expiration.
2. It includes tidal volume and inspiratory reserve volume.
IC = TV + IRV
1. It is the volume of air that can be exhaled after a normal inspiration.
2. It includes tidal volume and expiratory reserve volume. EC = TV + ERV
- #13-cVital capacity and Total lung capacityAns :
Vital capacity
(VC)
Total lung capacity
(TLC)
1. It is the maximum volume of air that can be exhaled after a maximum inspiration. It includes IC and ERV.
2. It is about 4000 mL in the human lungs.
1. It is the volume of air in the lungs after maximum inspiration. It includes IC, ERV, and residual volume.
2. It is about 5000 - 6000 mL in the human lungs.
- Qstn #14What is Tidal volume? Find out the Tidal volume (approximate value) for a healthy human in an hour.
Ans : Tidal volume is the volume of air inspired or expired during normal respiration.
It is about 6000 to 8000 mL of air per minute.
The hourly tidal volume for a healthy human can be calculated as:
Tidal volume = 6000 to 8000 mL/minute
Tidal volume in an hour = 6000 to 8000 mL × (60 min)
= 3.6 × 105 mL to 4.8 × 105 mL
Therefore, the hourly tidal volume for a healthy human is approximately 3.6 × 105 mL to 4.8 × 105 mL.