During inspiration in mammals, the diaphragm shall
Contract
relax
expand
shows no change
Correct Answer :
A. Contract
Related Questions
Anoxia means
absence of oxygen
diminished amount of oxygen delivered to the tissues
both (a) and (b)
none of these
Oxygen is transported to every cell of the body through
RBC
WBC
Both (a) and (b)
RBC and hormones
The condition in which the body suffers from acute oxygen shortage is called
anaemia
deoxygenation
detoxification
hypoxia
The functional unit of the lung is
neuron
alveolus
bronchus
none of these
In response to high altitude hypoxia supply of oxygen to the tissue is maintained by
increased alveolar ventilation and increased cardiac output
shift in the haemoglobin dissociation curve to the right
increased erythrocytes and haemoglobin content of blood
all of these
The respiratory tubes devoid of car-tilagenous rings are
trachea
bronchi
bronchioles
none of these
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 impulses reaching voluntary muscles for forced breathing originate from
medulla oblongata
spinal cord
vagus nerve
cerebrum
The process of breathing-in of oxygen rich air from outside is called
expiration
inspiration
respiration
oxidation
Colour of oxyhaemoglobin is
dull red
bluish red
bright red
dull brown
Diaphragm is characteristic of
egg-laying mammals only
marsupial mammals only
eutherian mammals only
all the mammals
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 vibrations of which of these membranes produces vocal sounds?
Glottis
Vocal cords
Vocal sacs
Epiglottis
The opening into the wind pipe or trachea is called
larynx
epiglottis
glottis
bronchi
The regulatory centre for respiration is situated in the
cerebral cortex
hypothalamus
medulla oblongata
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Which of the following can respire in total absence of air (anoxyliosis)?
Amoeba
Bed bug
Hydra
Tapeworm
Air directly enters the tracheae via the
external nares
pharynx
larynx
bronchi
The respiratory disease immediately related to cigarette smoking is
hypercapnia
pulmonary edema
hypoxia
emphysema
The rate of respiration is lowest at
sleeping
running
eating food
playing
In all vertebrates, the oxygen transport is through
haemocyanin
haemoglobin
myoglobin
haemoerythrin
The iron containing haemoglobin pigment is a
protein
polysaccharide
enzyme
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 capacity of lungs for air in a healthy man is about
500 ml
1000 ml
2000 ml
3000 ml
The metal associated with haemoglobin is
Copper
Magnesium
Iron
Manganese
During inspiration in mammals, the diaphragm shall
Contract
relax
expand
shows no change
In a man at rest the body's cells consume approximately
5000 ml of oxygen per day
5000 ml of oxygen per hour
500 ml of oxygen per hour
200 ml of oxygen per minute
Oxygen will diffuse through a membrane only if it is
moist
immersed in water
very thin
vascular
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 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
A normal man respires in a minute
25-30 times
10-15 times
14-18 times
20-25 times