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Breathing and Exchange of Gases

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Biology

Subject Chosen

Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

Distinguish between

(a) IRV and ERV.

(b)Inspiratory and expiratory capacity.
(c) Vital capacity and Total lung capacity. 


(a)

IRV

ERV

1. It is the amount of air inhaled forcibly after normal inspiration.

2. IRV=2500–3000ml

1. It is the amount of air exhaled forcibly after normal expiration.

2. ERV = 1000 – 1100 ml.



(b)

Inspiratory capacity

1. It is the total volume of air which can be inhaled after normal expiration.

2. I.C. = TV + IRV

3. IC is 3000– 3500 ml.

Expiratory capacity

1. It is the total volume of air expired after a normal inspiration.

2. EC = TV + ERV

3. EC= 1500- 1600 ml.



(c) 


Vital capacity Total lung capacity
1. It is the maximum
volume of air a person
can breathe in after a
forced expiration
1. Total volume of
air accommodated in
the lungs after a forced inspiration. 
2. VC = ERV + TV+ IRV 2. Total Lung capacity = VC + RV
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20 - 25 times
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