Mechanism of Breathing
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When 1500 ml of air is in the lungs, it is called the _________
Tidal volume
Vital capacity
Residual Volume
Inspiratory reserve volume
LocationPartial Pressure of Oxygen (mm Hg)1. Alveolii) 402. Oxygenated Bloodii) 1043. Tissueiii) 95
- 1-ii, 2-iii, 3-i
- 1-iii, 2-i, 3-ii
- 1-i, 2-iii, 3-ii
- 1-ii, 2-i, 3-iii
Alveoli of lungs are lined by _____________ epithelium:
transitional
columnar
cuboidal
squamous
Chest movements are inconspicuous during
Abdominal breathing
Both(A) and (B)
Thoracic breathing
Normal breathing
- False
- True
Regarding the assertion and reason; choose the correct option_______
Assertion [A]: The space in your chest cavity increases, into which your lungs expand.
Reason [R]: When the diaphragm tightens and moves downwards, inhalation of air occurs.
Assertion [A] is True and Reason [R] is False
Reason [R] is True and Assertion [A] is False
Assertion [A] is True and Reason [R] is True and is a correct explanation to [A]
Assertion [A] is True and Reason [R] is True but is not a correct explanation to [A]
Catabolic processes
break complex molecules into simpler ones
make complex molecules from simpler ones
occur only in autotrophs
occur only in heterotrophs
During expiration the diaphragm becomes:
Dome-shaped
Flattened
Contracted
Oblique
Regarding assertion and reason, choose the correct option_______.
Assertion [A]: Cold air causes vasodilation of blood vessels in the nasal cavity.
Reason [R]: Oxygen can be absorbed by widened blood vessels.
Assertion [A] is True and Reason [R] is False.
Reason [R] is True and Assertion [A] is False.
Assertion [A] is True and Reason [R] is True but is not a correct explanation to [A].
Assertion [A] is True and Reason [R] is True and is a correct explanation to [A].
- High pO2, high pCO2, less H+, higher temperature
- Low p02, low pCO2, more H+, higher temperature
- High p02, low pCO2, less H+, lower temperature
- Low p02, high pCO2, more H+, higher temperature
I. Type I cells of alveolar epithelium
II. Type II cells of alveolar epithelium
III. Basement membrane
IV. Lumen of blood capillaries
V. Endothelial cells of blood capillaries
- I, III , V
- I, II, IV
- II, III, IV
- II, IV, V
The most powerful respiratory stimulus for breathing in a healthy person is
Loss of oxygen in tissues
Increase of carbon dioxide in tissues
pH (acidosis)
pH (alkalosis)
Which of the following match with respect to the respiratory tract is incorrect?
Conducting Zone ->Ciliatedpseudostratified columnar cells.
Respiratory Zone -> Simple cuboidal or simple squamous cells.
Eustachian tube-link -> Channel that links the cavity of the middle ear with the nasopharynx.
Goblet cells, which secrete mucus ->, Present only in the nose.
Regarding assertion and reason, choose the correct option_______.
Assertion [A]: Cold air causes vasodilation of blood vessels in the nasal cavity.
Reason [R]: Oxygen can be absorbed by widened blood vessels.
Assertion [A] is True and Reason [R] is False.
Reason [R] is True and Assertion [A] is False.
Assertion [A] is True and Reason [R] is True and is a correct explanation to [A].
Assertion [A] is True and Reason [R] is True but is not a correct explanation to [A].
Complete the following statement using the choices below.
Air moves out of the lungs when the pressure inside the lungs is
Less than the pressure in the atmosphere
Greater than the pressure in the atmosphere
Equal to the pressure in the atmosphere
Greater than the intra-alveolar pressure
- Intrapulmonary pressure > atmospheric pressure
- Intrapulmonary pressure < atmospheric pressure
- Intrapulmonary pressure = atmospheric pressure
- Both A and C
Reason: Respiratory tree is responsible for clearing out foreign particles and humidifying the atmospheric air.
- Both the assertion and reason are true and the reason is the correct explanation for the assertion
- Both the assertion and reason are true but the reason is not the correct explanation for the assertion
- Assertion is true but the reason is false
- Reason is true but the assertion is false
I) Alveolar atria
II) Alveoli
III) Terminal bronchiole
IV) Respiratory bronchiole
V) Tertiary bronchi
- II only
- II, III, IV, and V only
- I, II, and III only
- I, II, and IV only