The immune responses in older people are weak due to the degeneration of:
1. Thyroid
2. Pineal
3. Adrenal
4. Thymus

Which one of the following four glands is correctly matched with the accompanying description?
1. Thyroid - hyperactivity in young children causes cretinism
2. Thymus - starts undergoing atrophy after puberty
3. Parathyroid - secrets parathormone which promotes movement of calcium ions from blood into bones during calcification
4. Pancreas - Delta cells of the Islets of Langerhans secrete a hormone which stimulates glycolysis in liver

Match the source gland with its respective hormone and function and select the correct option.

       Source gland             Hormone          Function
1.  Anterior pituitary         Oxytocin          Contraction of uterine muscles

2. Anterior pituitary          Vasopressin      Induces reabsorption of water in nephron 

3. Thymus                      Thymosin          Proliferation of T-lymphocytes 

4. $\mathrm{\alpha }$-cells of islets           Glucagon           Uptake of glucose into the cell.
     of Langerhans

A gland called ‘Clock of ageing’ that gradually reduces and degenerates in ageing is

1. thyroid
2. thymus
3. parathyroid
4. pituitary

Which of the following hormone is responsible for cell mediated immunity?