Flashcards For NEET Biology - Breathing and Exchange of Gases

Flashcards for NEET Biology are designed to boost your NEET preparation. Find below flashcards for Breathing and Exchange of Gases. These flashcards on Breathing and Exchange of Gases are prepared as per the NEET syllabus. This is helpful for aspirants of NEET and other exams during last-minute revision. Flashcards For NEET Biology – Breathing and Exchange of Gases, covers all the important points that are frequently asked in the exam. Check BYJU’S for the full set of Flashcards and Study material for NEET Biology. Solve NEET Biology MCQs to check your understanding and outperform in the exam.

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Name of the NEET sub-section

Topic

Flashcards helpful for

Biology

Breathing and Exchange of Gases

NEET exams

 

flashcards for neet biology breathing and exchange of gases 1
flashcards for neet biology breathing and exchange of gases 2
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Breathing and Exchange of Gases

Inspiration

Diaphragm contracted, ribs and sternum raised

Increase in thoracic and pulmonary volume resulting in a decrease in intrapulmonary pressure

Expiration

Diaphragm relaxed and arched upwards, ribs and sternum returned to the original position

The decrease in thoracic and pulmonary volume resulting in an increase in intrapulmonary pressure

Tidal volume

The volume of air inspired or expired normally

500 ml

Inspiratory reserve volume (IRV)

Additional air inspired by a forcible inspiration

2500-3000 ml

Inspiratory capacity (IC) = TV+IRV

Expiratory reserve volume (ERV)

Additional air expired by a forcible expiration,1000 -1100 ml

Expiratory capacity (EC) = TV+ERV

Residual volume (RV)

Air remaining in the lungs after forcible expiration,1100 – 1200 ml

Functional residual capacity = ERV+RV

Vital capacity (VC)

The maximum volume of air that can be inspired or expired = ERV+TV+IRV

Total lung capacity = VC+RV

Oxygen transport

Formation of oxyhaemoglobin in alveoli – high pO2, low pCO2, H+ and temp

Dissociation of oxyhaemoglobin in tissues – low pO2, high pCO2, H+ and temp

Carbon dioxide transport

Carbamino-haemoglobin – 20-25%

Bicarbonate – 70%

Dissolved in plasma – 7%

Neural regulation of respiration

Rhythm centre – medulla region

Pneumotaxic centre – pons region

Chemical control of respiration

Chemosensitive area in medulla oblongata – sensitive to CO2 and H+ conc.

Receptors in the aortic arch and carotid artery – sense changes in CO2 and H+ conc.

Emphysema

Due to damage in alveolar walls

Alveoli

Thin squamous epithelium of pneumocyte cells

Type I – smaller and help in gaseous exchange

Type II – larger and secrete lecithin, which acts as a surfactant and decreases surface tension

Diffusion membrane

Alveolar thin squamous epithelium

Middle basement membrane

Endothelium of blood capillaries

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