Given alongside is the figure of a median section of an organ. Study the same and answer the following questions :

1. Name the organ and write its location in our body.
2. Label the guidelines 1 to 4.
3. Write one important function of hypothalamus.
4. Which of the structures from 1 to 4 is considered as the master gland of the body ?
5. Mention the basic structural unit of the organ shown in the figure and the organ system to which it belongs.

1. The organ shown in the given figure is the human brain. It is contained in, and protected by, a bony structure called the skull or the cranium. The brain is further enclosed in three protective membranes, collectively called as meninges, which are separated by cerebrospinal fluid.

2. The guidelines 1 to 4 show:
   1 → Cereberal hemisphere
   2 → Cerebellum
   3 → Medulla Oblongata
   4 → Pituitary

3. One important function of the hypothalamus is regulating body temperature. It acts as the body's thermostat, monitoring internal temperature and initiating responses like sweating or shivering to maintain a stable internal environment.

4. The pituitary gland is often called the "master gland" of the human body because it produces hormones that regulate many other glands and bodily functions.

5. The basic structural and functional unit of the brain is the neuron (also known as a nerve cell). Neurons belong to the nervous system.