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  • How to Understand the Human Body Systems. You don't have to be a doctor to know the

  • skin you're in. Find out what each body system does to get a better understanding of what's

  • really going on inside of you. You will need and human body. Step 1. Journey into the digestive

  • system, which is made up of your stomach, liver, teeth, tongue, pancreas, intestines,

  • and esophagus. The digestive system breaks down food and absorbs nutrients for use as

  • energy. Step 2. Take a look inside the respiratory system, consisting of your lungs, nasal passages,

  • bronchi, bronchial tubes, pharynx, trachea, and diaphragm. This system takes in oxygen,

  • gets it into the bloodstream, and removes carbon dioxide from the body. Step 3. Travel

  • along the nervous system, made up of your spinal cord, brain, nerves, eyes, ears, tongue,

  • and nose. The nervous system is what makes you see what you see, feel what you feel,

  • taste what you taste, smell what you smell, and think what you think. Step 4. Understand

  • the excretory system. Your kidneys, bladder, ureters, and skin all function to control

  • water and salt balance. Step 5. Know your endocrine system, which consists of your pituitary

  • gland, adrenal gland, thyroid gland, and gonads or ovaries. These organs produce hormones

  • and regulate the body. Step 6. Take a spin around the circulatory system, made up of

  • blood, blood vessels, your heart, and lymph, which transport nutrients, metabolic waste,

  • water, salts, and disease-fighting cells. The circulatory system is responsible for

  • getting oxygen to your organs. Step 7. Stroll through the musculoskeletal system, consisting

  • of bones and muscles that provide movement and protection. Your skull is actually a series

  • of fused bones that act as a hard protective helmet for your brain. Step 8. Get into the

  • integumentary system, made up of your skin. Skin provides body heat regulation, holds

  • receptors for stimuli response, maintains tissue moisture, and protects the body from

  • injury and bacteria. Did you know The skin is the human body's largest organ.

How to Understand the Human Body Systems. You don't have to be a doctor to know the

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