Damage to thymus in a child may lead to
a reduction in haemoglobin content of blood
a reduction in stem cell production
loss of antibody mediated immunity
loss of cell mediated immunity
Continuous bleeding from an injured part of body is due to deficiency of
Vitamin-A
Vitamin-B
Vitamin-K
Vitamin -E
Wall of blood capillary is formed of
Haemocytes
parietal cells
endothelial cells
oxyntic cells
The thickening of walls of arteries is called
arthritis
artherosclerosis
anaeurysm
Both (a) and (c)
In mammals, histamine is secreted by
fibroblasts
histocytes
lymphocytes
mast cells
The carbon dioxide is transported via blood to lungs as
dissolved in blood plasma
in the form of carbonic acid only
in combination with haemoglobin only
carbaminohaemoglobin and as carbonic acid
The antibodies are
germs
carbohydrates
proteins
lipids
Sickle cell anaemia is due to
change of amino acide in both - chain of haemoglobin
change of amino acid in β- chains of haemoglobin
change of amino acid in both and β chains of haemoglobin
change of amino acid in either or β- chain of haemoglobin
In alveoli of the lungs, the air at the site of gas exchange, is separated from the blood by
alveolar epithelium only
alveolar epithelium and capillary endothelium
alveolar epithelium, capillary endothelium and tunica adventitia
alveolar epithelium, capillary endothelium, a thin layer of tunica media and tunica adventitia.
People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude of 5400 metre have around 8 million. This is because at high altitude.
atmospheric O2 level is less and hence, more RBCs are needed to absorb the required amount of O2 to survive
there is more UV radiation which enhances RBC production
people eat more nutritive food, therefore, more RBCs are formed
people get pollution - free air to breathe and more oxygen is available
