In frog, the alveoli are surrounded by
flattened and ciliated cells to increase the surface area of lungs
columnar and ciliated cells to increase the surface area of lungs
only ciliated cells to increase the surface area of lungs
only squamous cells to decrease the surface area of lungs
Correct Answer :
B. columnar and ciliated cells to increase the surface area of lungs
Related Questions
A normal man respires in a minute
25-30 times
10-15 times
14-18 times
20-25 times
The regulatory centre for respiration is situated in the
cerebral cortex
hypothalamus
medulla oblongata
procencephalon
Internal respiration refers to
exchange of gases between lungs and blood
cellular respiration
exchange of gases between lungs and atmosphere
respiration in open air
The substances undergoing slow oxidation in the body during respiration are known as
Oxidases
Metabolites
ATP
ADP
The impulses reaching voluntary muscles for forced breathing originate from
medulla oblongata
spinal cord
vagus nerve
cerebrum
Oxygen is transported to every cell of the body through
RBC
WBC
Both (a) and (b)
RBC and hormones
Among the following, the maximum amount of usable energy is released per-molecule of glucose by
yeast cell in fermentation
a liver cell in glycolysis
an Amoeba in aerobic respiration
a muscle cell in lactic acid formation
The medullary inspiratory centre is always under direct control of
chemicals
physical conditions
nerves
all of these
The opening into the wind pipe or trachea is called
larynx
epiglottis
glottis
bronchi
Anoxia means
absence of oxygen
diminished amount of oxygen delivered to the tissues
both (a) and (b)
none of these
The rate of respiration is lowest at
sleeping
running
eating food
playing
Colour of oxyhaemoglobin is
dull red
bluish red
bright red
dull brown
The condition in which the body suffers from acute oxygen shortage is called
anaemia
deoxygenation
detoxification
hypoxia
In all vertebrates, the oxygen transport is through
haemocyanin
haemoglobin
myoglobin
haemoerythrin
Oxygen will diffuse through a membrane only if it is
moist
immersed in water
very thin
vascular
Emphysema is a respiratory disease in which
the larynx is closed
the trachea gets narrowed
the gas exchange area of lungs is increased
the gas exchange area of lungs is decreased
The greatest volume of air that can be expired after a maximum inspiratory affect, is its
residual volume
tidal volume
vital capacity
lung volume
The membrane covering the lungs is
conjunctiva
pleura
meninges
peritoneum
The rate and depth of breathing is primarily controlled by medulla by
the oxygen content of the blood
the nitrogen content of the blood
receptors in the larynx
the carbon dioxide content of the bkxxl
The oxygen pressure in the alveolar air is
less than that is lung capillaries
equal to that in lung capillaries
double of that in lung capillaries
half of that in lung capillaries
The functional unit of the lung is
neuron
alveolus
bronchus
none of these
The oxygen content of expired air in man is
3 per cent
25 per cent
16 per cent
20 per cent
The process of breathing-in of oxygen rich air from outside is called
expiration
inspiration
respiration
oxidation
Tissue respiration is a process by which
carbohydrates are synthesised
proteins are broken down
fat molecules are metabolised
energy is liberated
The maximum volume of inspirable air is called
vital capacity
residual volume
inspiratory capacity
any of these
The carbon dioxide pressure in the lung capillaries is
less than that in alveolar air
more than that in alveolar air
equal to that in alveolar air
similar to oxygen pressure in the capillaries
During inspiration in mammals, the diaphragm shall
Contract
relax
expand
shows no change
In frog, the alveoli are surrounded by
flattened and ciliated cells to increase the surface area of lungs
columnar and ciliated cells to increase the surface area of lungs
only ciliated cells to increase the surface area of lungs
only squamous cells to decrease the surface area of lungs
Diaphragm is characteristic of
egg-laying mammals only
marsupial mammals only
eutherian mammals only
all the mammals
The respiratory disease immediately related to cigarette smoking is
hypercapnia
pulmonary edema
hypoxia
emphysema