Which structure gradually becomes smaller with increasing age?

Myasthenia gravis is related to which hormone?

According to the modern theory of aging,our body gradually loses its ability to resist bacteria and pathogens. This process is caused by the gradual disappearance (atrophy) of which organ?

Which of the following glands is responsible for immunity in humans?

The thymus is a lobed organ located near the $...A...$ and beneath the $...B...$. The most appropriate combination for $A$ and $B$ is:

The size of this gland varies significantly with the age of the individual.