Human Body Systems

خلاصه :

The Human Body Systems The human body is amazing. It has many systems, and each system has an important job. These systems work together every day to keep us alive and healthy. The skeletal system is made of bones. It gives shape to the body and helps us stand tall. Bones also protect organs, like the skull protecting the brain. The muscular system is made of muscles. Muscles help us move, walk, run, and lift things. They also work when we smile or frown. The circulatory system moves blood around the body. The heart pumps blood, and blood carries oxygen and food to all parts. The respiratory system helps us breathe. We take in oxygen from the air and breathe out carbon dioxide. Lungs are the main organs here. The digestive system breaks down food. The stomach and intestines change food into energy for the body. The nervous system controls actions and feelings. The brain, spinal cord, and nerves send messages so we can think, move, and feel. The immune system protects us from sickness. It fights germs and keeps us strong. All systems are connected. If one system has a problem, the whole body can feel weak. For example, if the respiratory system does not work well, we may feel tired. To keep our body systems healthy, we need good food, clean water, exercise, and rest. Caring for our body helps all systems work well together.