karachi

KARACHI is the biggest city of Pakistan. It is also known as "city of lights". It is located in the province of Sindh. There are many picnic spots like parks, sea-view, clifton, paradise point, port grand, mazar-e-quaid, P.A.F museum etc where people come to enjoy their life and spend their time with their families on holidays. 

 There are many popular food streets in Karachi where delicious, yummy and spicy food is available.

The life in Karachi is busy and hactic. People has to compete with many sharp people which makes one smarter. It is a very beautiful city and popular tourist spot.There are two big ports kemari port and Qasim port.

kEMARI PORT

PORT QASIM

There are many flyovers,cinemas,schools,hospitals etc. Please visit this beautiful city.

Nervous system

Brain and spinal cord together form central nervous system.The nerves branch off from central nervous system to all parts of body.The spinal cord contains nerves that carry messages between brain and body.The basic working unit of nervous system is called a neuron ( nerve cell ).

NEURON:-

                     Neurons are long,thin or a metre long. A neuron consists of cell body containing a nucleus and special extentions called axons and dendrites.Dendrites bring information to cell body while axons take information away from cell body.Messages travel along nerve cells as tiny electrical signals called impulses.         

There are two types of nerve cells.

1 Sensory nerve cells

2 Motor nerve cells

Motor nerve cell:-

                              They carry impulses from central nervous system to muscles and glands.

Sensory nerve cells:-

                               They carry impulses from sense receptors around the body to the central nervous system.