The alveolar epithelium in the lung is
(a) non-ciliated columnar
(b) non-ciliated squamous
(c) ciliated columnar
(d) ciliated squamous. (1990)

Approximately seventy percent of carbon dioxide
absorbed by the blood will be transported to the
lungs
(a) as bicarbonate ions
(b) in the form of dissolved gas molecules
(c) by binding to RBC
(d) as carbamino - haemoglobin. (2014)

Reduction in pH of blood will
(a) decrease the affinity of haemoglobin with
oxygen
(b) release bicarbonate ions by the liver
(c) reduce the rate of heartbeat
(d) reduce the blood supply to the brain.
(NEET-I 2016)

How the transport of O2 and CO2 by blood happens?
(a) With the help of WBCs and blood serum
(b) With the help of platelets and corpuscles
(c) With the help of RBCs and blood plasma
(d) With the help of RBCs and WBCs (1996)

When CO2 concentration in blood increases
breathing becomes
(a) shallower and slow
(b) there is no effect on breathing
(c) slow and deep
(d) faster and deeper. (2004)

Blood analysis of a patient reveals an unusually high
quantity of carboxyhaemoglobin content. Which
of the following conclusions is most likely to be
correct?
The patient has been inhaling polluted air containing
unusually high content of
(a) carbon disulphide (b) chloroform
(c) carbon dioxide (d) carbon monoxide.
(2004)

Name the pulmonary disease in which alveolar
surface area involved in gas exchange is drastically
reduced due to damage in the alveolar walls.
(a) Pneumonia (b) Asthma
(c) Pleurisy (d) Emphysema (2015)

Due to increasing air-borne allergens and pollutants,
many people in urban areas are suffering from
respiratory disorder that cause wheezing due to
(a) reduction in the secretion of surfactant by
pneumocytes
(b) benign growth on mucous lining of nasal cavity
(c) inflammation of bronchi and bronchioles
(d) proliferation of fibrous tissues and damage of
the alveolar walls. (NEET 2019

Approximately seventy percent of carbon dioxide
absorbed by the blood will be transported to the
lungs
(a) as bicarbonate ions
(b) in the form of dissolved gas molecules
(c) by binding to RBC
(d) as carbamino - haemoglobin. (2014)

Reduction in pH of blood will
(a) decrease the affinity of haemoglobin with
oxygen
(b) release bicarbonate ions by the liver
(c) reduce the rate of heartbeat
(d) reduce the blood supply to the brain.
(NEET-I 2016)

Reduction in pH of blood will
(a) decrease the affinity of haemoglobin with
oxygen
(b) release bicarbonate ions by the liver
(c) reduce the rate of heartbeat
(d) reduce the blood supply to the brain.
(NEET-I 2016)

Identify the wrong statement with reference to
transport of oxygen.
(a) Binding of oxygen with haemoglobin is mainly
related to partial pressure of O2.
(b) Partial pressure of CO2 can interfere with O2
binding with haemoglobin.
(c) Higher H+ conc. in alveoli favours the formation
of oxyhaemoglobin.
(d) Low pCO2 in alveoli favours the formation of
oxyhaemoglobin. (NEET 2020)

What is vital capacity of our lungs?
(a) Inspiratory reserve volume plus expiratory
reserve volume
(b) Total lung capacity minus residual volume
(c) Inspiratory reserve volume plus tidal volume
(d) Total lung capacity minus expiratory reserve
volume (2009)

The partial pressure of oxygen in the alveoli of the
lungs is
(a) equal to that in the blood
(b) more than that in the blood
(c) less than that in the blood
(d) less than that of carbon dioxide. (NEET-II 2016)

Which one of the following is a possibility for most
of us in regard to breathing, by making a conscious
effort?
(a) One can breathe out air totally without oxygen.
(b) One can breathe out air through Eustachian
tube by closing both nose and mouth.
(c) One can consciously breathe in and breathe
out by moving the diaphragm alone, without
moving the ribs at all.
(d) The lungs can be made fully empty by forcefully
breathing out all air from them. (Mains 2011)

Lungs do not collapse between breaths and some
air always remains in the lungs which can never be
expelled because
(a) there is a negative pressure in the lungs
(b) there is a negative intrapleural pressure pulling
at the lung walls
(c) there is a positive intrapleural pressure
(d) pressure in the lungs is higher than the
atmospheric pressure.
(NEET-II 2016)

Lungs are made up of air-filled sacs, the alveoli.
They do not collapse even after forceful expiration,
because of
(a) inspiratory reserve volume
(b) tidal volume
(c) expiratory reserve volume
(d) residual volume. (NEET 2017)

Select the correct statement.
(a) Expiration occurs due to external intercostal
muscles.
(b) Intrapulmonary pressure is lower than the
atmospheric pressure during inspiration.
(c) Inspiration occurs when atmospheric pressure
is less than intrapulmonary pressure.
(d) Expiration is initiated due to contraction of
diaphragm. (Odisha NEET 2019)

inspiration.
(1) Contraction of diaphragm
(2) Contraction of external inter-costal muscles
(3) Pulmonary volume decreases
(4) Intra pulmonary pressure increases
(a) (1) and (2)
(b) (3) and (4)

(c) (1), (2) and (4)
(d) only (4) (NEET 2020)

Lungs are enclosed in
(a) periosteum (b) perichondrium
(c) pericardium (d) pleural membrane.
(1996)