Watch more Science Basics videos: http://www.howcast.com/guides/70-Science-Basics Subscribe to Howcast's YouTube Channel - http://howc.st/uLaHRS Understand the human body systems with these steps. Howcast uploads the highest quality how-to videos daily! Be sure to check out our playlists for guides that interest you: http://howc.st/ytmainplaylists Subscribe to Howcast's other YouTube Channels: Howcast Health Channel - http://howc.st/HOE3aY Howcast Video Games Channel - http://howc.st/tYKKrk Howcast Tech Channel - http://howc.st/rx9FwR Howcast Food Channel - http://howc.st/umBoJX Howcast Arts & Recreation Channel - http://howc.st/vmB86i Howcast Sports & Fitness Channel - http://howc.st/vKjUjm Howcast Personal Care & Style Channel - http://howc.st/vbbNt3 Howcast empowers people with engaging, useful how-to information wherever, whenever they need to know how. Emphasizing high-quality instructional videos, Howcast brings you experts who provide accurate information in easy-to-follow tutorials on everything from makeup, hairstyling, nail art design, and soccer to parkour, skateboarding, dancing, kissing, and much, much more. Step 1: Journey into the digestive system 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: Look inside respiratory system 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 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 Understand the excretory system. Your kidneys, bladder, ureters, and skin all function to control water and salt balance. Step 5: Know your endocrine system 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 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 Stroll through the musculoskeletal system, consisting of bones and muscles that provide movement and protection. Tip 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 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.
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