Appart Mathy

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The human body is made up of many different systems that work together to keep us alive and healthy. The nervous system sends signals to other parts of the body, helping us move, feel sensations, and think. It also helps control our organs, like our heart beating and lungs breathing. The circulatory system delivers oxygen and nutrients throughout the body. This system includes the heart, which pumps blood through a network of vessels, as well as the blood itself, which is made up of different types of cells that carry these essential substances. The respiratory system brings in air from outside, using tiny tubes called bronchioles to reach deep into the lungs where oxygen can be absorbed into the bloodstream. The digestive system breaks down food into nutrients that our body needs. It starts with the mouth, where teeth chew and saliva helps break down the food into smaller pieces. The stomach then digests these particles further, mixing them with enzymes that break them down even more. This mixture is then passed through the small intestine, where most of the nutrient absorption takes place. The immune system protects us from germs and other foreign substances by using white blood cells to fight off infections. These cells can attack and destroy harmful invaders or send out signals for help if they are overwhelmed. The endocrine system uses hormones to regulate various bodily functions, such as growth and development, metabolism, and reproductive processes. The musculoskeletal system gives us support and movement through its network of bones, muscles, tendons, and ligaments. It allows us to stand up straight, walk around, run, jump, or do just about anything else we want to do with our bodies.