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THYMUS -
It is derived from the endoderm of the embryo.
Structure. The thymus gland is located in the upper part of the thorax near the heart. It is a soft, pinkish, bilobed mass of lymphoid tissue. It is a prominent gland at the time of birth but it gradually atrophies In the adult.
Hassall's corpuscles are spherical or oval bodies present in the thymus. They are phagocytic in function.
Hormone. Thymus secretes a hormone named thymosin which stimulates the development of certain kinds of white blood cells involved in producing immunity. It also hastens attainment of sexual maturity.
Thymosin hormone stimulates the lymphocytes to destroy the antigens produced by bacteria or pathogen. It self may be destroyed by these lymphocytes.
UTERUS (WOMB) - Large, pyriform, highly elastic. Development of embryo takes place in it. It is located above and behind the urinnary bladder. Attached to body wall by me
Formation of Gemmules Throughout the formation of gemmules, masses of food - laden amoebocytes called archaeocytes feed on other cells and lay down in within them. They get s
Endocrine glands
Transfer RNA molecules are notable for having generally nucleotides shown in the figure such as 1-methylguanosine (m1G), pseudouridine (Ψ), dihydrouridine (D), inosine (I) and
Explain the gradient theoryof experimental embryology
secretary tapetum
The part of human brain which is a significant relay station for the sensory impulses and also is the origin of many of the involuntary acts of eye such as narrowing of the pupil i
COMMON DISEASE OF SHEEP - 1 . ANTHRAX - Persons working in wool factories may get infection by breathing. 2 . BLACK QURTER 3 . HAEMORRHAGIC S
Q. In the metagenesis of Obelia and Aurelia what is the form that produces gametes? What is the form that reproduces asexually? In the metagenesis of some coelenterates, like O
Q. What are the few examples of the structural function of organic molecules? Organic molecules have a structural function as they are part of cell membranes, organ walls, cyto
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