Lymphoid Organ

Fill in the blanks The …..a……. Lymphoid organs provide the sites for interaction of lymphocytes with antigen which then proliferate to become …..b….. 2 . The thymus is a lobed organ located near the heart and beneath the ….C….. 3. Spleen has a large reservoir of .....d.....

In the following question a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as : Assertion (A): Bone marrow and thymus are primary lymphoid organs. Reason(R): It is the organs, to which matured lymphocytes migrate, interact with antigens and then proliferate to become effector cells.

The _________1_____________ is the main lymphoid organ where all blood cells _________2_____________ lymphocytes are produced. The _________3_____________ is a lobed organ located near the heart and beneath the breastbone. The _________3_____________ is quite large at the time of birth but keeps reducing in size with age and by the time puberty is attained it reduces to a very small size. Both _________1_____________ and _________3_____________ provide micro-environments for the development and maturation of T-lymphocytes.

The stroma of most lymphoid oragans is composed of "__________"

Assertion : MALT constitutes about fifteen per cent of the lymphoid tissue in human body. Reason : The bone marrow is the main lymphoid orgain where all bllod cells excluding lymphocytes are produced.

Select the correct option to fill up the blanks. (i) Diseases which are easily transmitted from one person to another, are called ______ diseases. (ii) In human body, parasite of malaria initially multiplies within the ____ and then attack the ______. (iii) _____ is the yellowish fluid secreted by mother during the initial days of lactation. (iv) _____ and ____ are the primary lymphoid organs.

Bursa of fabrica is lymphoid orgen in

Lymphoid lenosis in a poultry is a: