Vital capacity of lung is ________.

NEET-2023 [Breathing-and-Exchange-of-Gases] [class-xi ]

• IRV + ERV + TV
• IRV + ERV
• IRV + ERV + TV + RV
• IRV + ERV + TV – RV
Correct Option: A  [ IRV + ERV + TV ]

Remark:

Under normal physiological conditions in human being every 100 ml of oxygenated blood can deliver ___________ ml of O₂ to the tissues.

NEET-2022 [Breathing-and-Exchange-of-Gases] [class-xi ]

• 5 ml
• 4 ml
• 10 ml
• 2 ml
Correct Option: A  [ 5 ml ]

Remark:

Which of the following is not the function of conducting part of respiratory system ?

NEET-2022 [Breathing-and-Exchange-of-Gases] [class-xi ]

• Inhaled air is humidified
• Temperature of inhaled air is brought to body temperature
• Provides surface for diffusion of O₂ and CO₂
• It clears inhaled air from foreign particles
Correct Option: C  [ Provides surface for diffusion of O₂ and CO₂ ]

Remark:

The partial pressures (in mm Hg) of oxygen (O₂) and carbon dioxide (CO₂) at alveoli (the site of diffusion) are :

NEET-2021 [Breathing-and-Exchange-of-Gases] [class-xi ]

• pO₂ = 104 and pCO₂ = 40
• pO₂ = 40 and pCO₂ = 45
• pO₂ = 95 and pCO₂ = 40
• pO₂ = 159 and pCO₂ = 0.3
Correct Option: A  [ pO₂ = 104 and pCO₂ = 40 ]

Remark:

Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.

NEET-2021 [Breathing-and-Exchange-of-Gases] [class-xi ]

• High pO₂, low pCO₂, less H⁺, lower temperature
• Low pO₂, high pCO₂, more H⁺, higher temperature
• High pO₂, high pCO₂, less H⁺, higher temperature
• Low pO₂, low pCO₂, more H⁺, higher temperature
Correct Option: A  [ High pO₂, low pCO₂, less H⁺, lower temperature ]

Remark:

Select the correct events that occur during inspiration.
A. Contraction of diaphragm
B. Contraction of external inter-costal muscles
C. Pulmonary volume decreases
D. Intra pulmonary pressure increases

NEET-(Sept)2020 [Breathing-and-Exchange-of-Gases] [class-xi ]

• (A) and (B)
• (C) and (D)
• (A), (B) and (D)
• only (D)
Correct Option: A  [ (A) and (B) ]

Remark:

Identify the wrong statement with reference to transport of oxygen.

NEET-(Sept)2020 [Breathing-and-Exchange-of-Gases] [class-xi ]

• Binding of oxygen with haemoglobin is mainly related to partial pressure of O₂.
• Partial pressure of CO₂ can interfere with O₂ binding with haemoglobin.
• Higher H⁺ conc. in alveoli favours the formation of oxyhaemoglobin.
• Low pCO₂ in alveoli favours the formation of oxyhaemoglobin.
Correct Option: C  [ Higher H⁺ conc. in alveoli favours the formation of oxyhaemoglobin. ]

Remark:

The Total Lung Capacity (TLC) is the total volume of air accomodated in the lungs at the end of a forced inspiration. This includes:

NEET-(Oct)2020 [Breathing-and-Exchange-of-Gases] [class-xi ]

• RV; IC (Inspiratory Capacity); EC (Expiratory Capacity); and ERV
• RV; ERV; IC and EC
• RV; ERV; VC (Vital Capacity) and FRC (Functional Residual Capacity)
• RV (Residual Volume); ERV (Expiratory Reserve Volume); TV (Tidal Volume); and IRV (Inspiratory Reserve Volume)
Correct Option: D  [ RV (Residual Volume); ERV (Expiratory Reserve Volume); TV (Tidal Volume); and IRV (Inspiratory Reserve Volume) ]

Remark:

Match the following columns and select the correct option :

NEET-(Oct)2020 [Breathing-and-Exchange-of-Gases] [class-xi ]

• (A)-(I), (B)-(III), (C)-(II), (D)-(IV)
• (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
• (A)-(III), (B)-(II), (C)-(IV), (D)-(I)
• (A)-(IV), (B)-(I), (C)-(III), (D)-(II)
Correct Option: B  [ (A)-(II), (B)-(III), (C)-(IV), (D)-(I) ]

Remark:

According to Central Pollution Control Board [CPCB] what size (in diameter) of particulate is responsible for causing greater harm to human health ?

NEET-(Oct)2020 [Breathing-and-Exchange-of-Gases] [class-xi ]

• 3.5 micrometers
• 2.5 micrometers
• 4.0 micrometers
• 3.0 micrometers
Correct Option: B  [ 2.5 micrometers ]

Remark: