Body Systems
Every body system has their own function.
Theres eleven body systems.The human skeleton is the internal framework of the body. It is composed of 270 bones at birth - this total decreases to 206 by adulthood after some bones have refused together.
The bone mass in the skeleton reaches maximum density around age 30.
The human skeleton serves 3 major functions; support, movement and protection.
Another body system is the
Integumentary System provides covering for the body which protects against infection & injury, prevents water loss, helps regulate body temperature, & gets rid of some liquid waste Immune System defends the body against infectious disease.The immune system is a system of biological structures and processes within an organism that protects against disease. To function properly, an immune system must detect a wide variety of agents, known as pathogens, from viruses to parasitic worms, and distinguish them from the organism's own healthy tissue
Cardiovascular System responsible for carrying oxygen and nutrients to all the cells in the body and carrying away carbon dioxide and other wastes Respiratory System keeps blood constantly supplied with oxygen and removes carbon dioxide. The gaseous exchanges occur through the walls of the air sacs of the main organs in this system.

Excretory System filters wastes (some salts and excess water) from the blood and removes them from the body as urine.
Digestive System breaks down foods into nutrients that can be used by the body, absorbs nutrients, and rids body of solid wastes
Skeletal System
Provides support and