Human Body: organ system
Our body has 10 organ systems: Skeletal system, muscular system, nervous system, immune and lymphatic systems, endocrine system, cardiovascular system, respiratory system, digestive system, urinary system, and reproductive system. Each of them has different organs that do different jobs. All together work as one and make up organism.
The skeletal system includes all of the bones and joints in the body. The skeleton acts support and protection for the soft tissues that make up the rest of the body. The skeletal system also provides attachment points for muscles to allow movements at the joints. An adult has 206 bones in all. 22 of them are part of skull and rest of them from body.

The muscular system is responsible for the movement of the human body. Muscle tissue is also found inside of the heart, digestive organs, and blood vessels. In these organs, muscles serve to move substances throughout the body. These muscles protect all the organs.

The nervous system consists of the brain and spinal cord. These organs are responsible for the control of the body. The brain and spinal cord are control center.

The immune and lymphatic systems are organ systems that share several organs. The immune system is our body’s defense system against infectious of viruses, bacteria, as well as parasitic animals. The immune system works to keep these harmful agents out of the body.

The endocrine system includes all of the glands of the body and these glands produce hormones. By regulating the functions of organs in the body, these glands help to maintain the body’s homeostasis (balance).

The cardiovascular system consists of the heart and blood vessels. Responsible for transporting oxygen, nutrients, hormones, the cardiovascular system is powered by the body’s hardest-working organ the heart, which is only about the size of a closed fist.
The respiratory system provides oxygen to the