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A vein possesses a large lumen because
Veins have larger diameters and thinner walls as compared to arteries.
So veins have larger lumens and contribute capacitance to the circulation, holding approximately two thirds of all circulating blood.
The intima and adventitia are similar in structure and function to arteries but the media is much thinner due to significantly less smooth muscle and elastic tissue.
Veins therefore do not have the same capacity for elastic recoil and vasoconstriction as arteries.
Blood is propelled forward by contraction of surrounding muscles and pressure gradients created during inspiration and expiration.
The process of micropropagation is the formation of new plants from
Mr. X is eating curd/yoghurt. For this food intake, in a food chain he is considered as occupying
Which of the following lies between replication and translocation ?
Which one is not produced in Escherichia coli present in lactose medium?
In sickle cell anaemia, death occurs when lethal genes are present in
A genetically diseased male marries a normal female producing three diseased girls and five normal sons. It would be a
In a cross between heterozygous tall(Tt) and homozygous tall (TT), there is a progeny of 12. How many of them would be tall
A blood group has both A and B antigens but no antibodies. It is
The vascular cambium and cork cambium are the examples of
Gradient of turgor pressure as the possible mechaninsm of nutrient transpiration was given by
The restriction enzymes are used in genetic engineering because they
The decomposition of domestic wastes, under natural process, is known as
Which of the following metal is pollutant that causes sterility in human beings?
Manganese pollution causes sterility. It is found in water bodies which come from thermal power plants and fungicides.
The presence of human chorionic gonadotropin (HCG) in a woman’s urine indicates that she
Variations giving rise to new species are serialised by the process of
Which of the following organelles is found in large numbers in the cells, which line the proximal convoluted tubule?
The inability to regulate the concentration of sodium ions in the blood could be due to improper functioning of the