Which endocrine gland is not ectodermal in origin?

Old people have a weak immune system. What could be the reason?

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.

At the time of birth,the thymus gland is:

Damage to the thymus in a child may lead to

Surgical removal of the thymus of a newborn shall result in the failure to produce: