science 2

200-250 words max, original work, references

1.     Consider the following:

 If the thymus of an adult experimental animal is removed, the following

observations can be made: (a) No immediate effect occurs, and

(b) after 1 year, decreases occur in the number of lymphocytes in the

blood, the ability to reject grafts, and the ability to produce antibodies.

Explain these observations.