$T-$ lymphocytes are:

Which of the following gland grows to the maximum size at puberty and then diminishes gradually?

The thymus gland in mammals is primarily associated with which of the following?

Which structure gradually becomes smaller with increasing age?

Select the correct statements regarding Thymus gland.
i. It is located in the upper part of thorax.
ii. It is made up of four lobes of lymphoid tissue.
iii. It is a prominent gland formed at birth and remains active throughout life.
iv. It is also called temporary gland.
v. It plays an important role in the development of immune system and provides humoral immunity.
In the light of above statements,choose the correct option from below.

Which endocrine gland becomes inactive in old age?