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The internal composition of the cell is maintained because the plasma membrane is selectively permeable to small molecules. A lot of biological molecules are unable to distribute by the phospholipid bilayer so the plasma membrane develops a barrier which blocks the free exchange of molecules between the cytoplasm and the external environment of the cell. Exact transport proteins carrier proteins and channel proteins then mediate the careful passage of small molecules across the membrane, permitting the cell to control the composition of its cytoplasm.
A L VEOL I - Sac like structure, unit of lungs. Increase surface area, exchange of gases occur in it. Rich in blood capillaries. Aloeoli join by pore of Kuhn to form a
Concerning the thickness of their walls how different are the heart chambers? The ventricle walls are thicker than the atrium walls as ventricles are structures responsible for
Pathology: This concerned with the identification of different diseases, causative organs, their prevention and control methods. Pathology is a kind of study or diagnosis of diseas
Describe in detail about the Cytoplasm Cytoplasm also possesses a number of dense granular elements (about 25,000 per cell) called the ribosomes, which are the sites of protein
Why Iodine is Important for Human Body? Iodine is an essential constituent of the thyroid hormones: thyroxine (T 4 ) and triiodothyronine (T 3 ), which have a key role in growt
Q. What do you mean by QRS Changes? The total amplitude of the QRS compared with exercise usually decreases near peak workload, as well as the T-wave amplitude, and there is a
Intracellular digestion, or cellular digestion, is the breaking in the interior of the cell of big molecules coming from outside or even from the own cell metabolism into smaller m
The principal nitrogenous excretory compound in humans is synthesised: 1. in kidneys but eliminated mostly through liver 2. in kidneys as well as eliminated by kidneys 3.
What is vernalisation? How is the process of vernalisation benefits to plants?
It is IgE mediated hypersensitivity. Typical manifestations contain asthma, food allergies, eczema, hay fever etc.
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