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:

Match the following columns and select the correct option.

NEET-(Sept)2020 Body-Fluids-and-Circulation [class-xi ]

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

Remark:

The QRS complex in a standard ECG represents:

NEET-(Sept)2020 Body-Fluids-and-Circulation [class-xi ]

• Repolarisation of auricles
• Depolarisation of auricles
• Depolarisation of ventricles
• Repolarisation of ventricles
Correct Option: C  [ Depolarisation of ventricles ]

Remark:

Which of the following conditions cause erythroblastosis foetalis ?

NEET-(Oct)2020 Body-Fluids-and-Circulation [class-xi ]

• Mother Rh^+ve and foetus Rh^–ve
• Mother Rh^–ve and foetus Rh^+ve
• Both mother and foetus Rh^–ve
• Both mother and foetus Rh^+ve
Correct Option: B  [ Mother Rh^–ve and foetus Rh^+ve ]

Remark:

The increase in osmolarity from outer to inner medullary interstitium is maintained due to:
I. Close proximity between Henle's loop and vasa recta
II. Counter current mechanism
III. Selective secretion of HCO₃^- and hydrogen ions in PCT
IV. Higher blood pressure in glomerular capillaries

NEET-(Oct)2020 Excretory-Products-and-their-Elimination [class-xi ]

• Only(II)
• (III) and (IV)
• (I), (II) and (III)
• (I) and (II)
Correct Option: D  [ (I) and (II) ]

Remark:

Select the correct statement:

NEET-(Oct)2020 Excretory-Products-and-their-Elimination [class-xi ]

• Atrial Natriuretic Factor increases the blood pressure.
• Angiotensin II is a powerful vasodilator.
• Counter current pattern of blood flow is not observed in vasa recta.
• Reduction in Glomerular Filtration Rate activates JG cells to release renin.
Correct Option: D  [ Reduction in Glomerular Filtration Rate activates JG cells to release renin. ]

Remark: