Air directly enters the tracheae via the
external nares
pharynx
larynx
bronchi
Correct Answer :
C. larynx
Related Questions
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 oxygen content of expired air in man is
3 per cent
25 per cent
16 per cent
20 per cent
The substances undergoing slow oxidation in the body during respiration are known as
Oxidases
Metabolites
ATP
ADP
The "mountain sickness" in persons climbing to high attitudes without the aid of oxygen cylinders is due to
lack of sufficient amount of haemoglobin
lack of sufficient amount of erythrocytes
arterial hypoxia
anaemic hypoxia
The iron containing haemoglobin pigment is a
protein
polysaccharide
enzyme
none of these
Air directly enters the tracheae via the
external nares
pharynx
larynx
bronchi
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 capacity of lungs for air in a healthy man is about
500 ml
1000 ml
2000 ml
3000 ml
Tissue respiration is a process by which
carbohydrates are synthesised
proteins are broken down
fat molecules are metabolised
energy is liberated
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
Oxygen will diffuse through a membrane only if it is
moist
immersed in water
very thin
vascular
The maximum volume of inspirable air is called
vital capacity
residual volume
inspiratory capacity
any of these
Ciliated epithelium in the trachea of mammals helps in
sucking-in air
pushing expired air out
pushing mucus out
keeping the alveolar air in circulation
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
The respiratory disease immediately related to cigarette smoking is
hypercapnia
pulmonary edema
hypoxia
emphysema
To take air into the lungs, the diaphragmmust be
dome shaped
oblique
flattened
normal
The vibrations of which of these membranes produces vocal sounds?
Glottis
Vocal cords
Vocal sacs
Epiglottis
The process of breathing-in of oxygen rich air from outside is called
expiration
inspiration
respiration
oxidation
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 regulatory centre for respiration is situated in the
cerebral cortex
hypothalamus
medulla oblongata
procencephalon
The respiratory portion of the respiratory tract consists of
Pharynx, larynx, trachea, bronchi and bronchioles
Trachea, bronchi, bronchioles, alveolar ducts and alveoli
Respiratory bronchioles, alveola ducts, alveolar sacs and alveoli
Bronchi, bronchioles, alveolar ducts, alveolar sacs and alveoli
During inspiration in mammals, the diaphragm shall
Contract
relax
expand
shows no change
The opening into the wind pipe or trachea is called
larynx
epiglottis
glottis
bronchi
Which of the following can respire in total absence of air (anoxyliosis)?
Amoeba
Bed bug
Hydra
Tapeworm
In all vertebrates, the oxygen transport is through
haemocyanin
haemoglobin
myoglobin
haemoerythrin
The functional unit of the lung is
neuron
alveolus
bronchus
none of these
Diaphragm is characteristic of
egg-laying mammals only
marsupial mammals only
eutherian mammals only
all the mammals
The impulses reaching voluntary muscles for forced breathing originate from
medulla oblongata
spinal cord
vagus nerve
cerebrum
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
A normal man respires in a minute
25-30 times
10-15 times
14-18 times
20-25 times