Biology - Chemical Coordination and Integration Question with Solution | TestHub

The thymus gland is a lobular structure located on the dorsal side of the heart and the aorta. It plays a major role in the development of the immune system. The thymus is quite large at the time of birth but keeps reducing in size with age. By the time puberty is attained, it reduces to a very small size and gradually gets atrophied in adults. This degeneration results in a decreased production of thymosins, which is why the immune responses of older individuals become weak.

Answer: thymus gland