A person breathing normally at rest, takes in and expels approximately half a litre of air during each respiratory cycle. This is called :
tidal volume
vital capacity
inspiratory reserve volume
expiratory reserve volume
A.
tidal volume
Tidal volume is the amount of air inspired or expired in a single breath by a person at rest. It is about 500 ml for an average adult human male.
Vital capacity is the greatest volume of air that can be expelled from the lungs after taking the deepest possible breath.
Inspiratory reserve volume (IRV) is the additional air that can be forcibly inhaled after the inspiration of a normal tidal volume.
Expiratory reserve volume or ERV is the additional amount of air that can be expired from the lungs by determined effort after normal exiration.
Asthma is caused due to :
infection of lungs
infection of trachea
bleeding into pleural cavity
spasm in bronchial muscles
Mesophyll cells, which liberate malic acid at night time, are of :
C4 - plants
C3 - plants
C2 - plants
C1 - plants
The name of process of aerobic respiration, in which energy is provided in steps in electron transport chain, is :
EMP-pathway
decarboxylation
photophosphorylation
oxidative phosphorylation
The plants respond to photoperiods due to the presence of :
enzymes
stomata
phytochromes
phytohormones
The first heart sound is produced when :
diastole begins
semilunar valve close quickly
interventricular pressure decreases
bicuspid and tricuspid valve close quickly
