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How many total human body systems are there? The human body is made up of a head, neck, torso, two arms and two legs. The average height of an adult human is about 5 to 6 feet tall. The human body is made to stand erect, walk on two feet, use the arms to carry and lift, and has opposable thumbs (able to grasp). The adult body is made up of: 100 trillion cells 206 bones 600 muscles 22 internal organs There are many systems in the human body: Nervous System (brain, spinal cord, nerves) Circulatory System (heart, blood, vessels) Respiratory System (nose, trachea, lungs) Immune System (many types of protein, cells, organs, tissues) Skeletal System (bones) Excretory System (lungs, large intestine, kidneys) Urinary System (bladder, kidneys) Muscular System (muscles) Endocrine System (glands) Digestive System (mouth, esophogus, stomach, intestines) Reproductive System (male and female reproductive organs) What is the nervous system? The nervous system is a complex, sophisticated system that regulates and coordinates body activities. It is made up of two major divisions: * central nervous system - consisting of the brain and spinal cord. * peripheral nervous system - consisting of all other neural elements. In addition to the brain and spinal cord, principal organs of the nervous system include the following: * eyes * ears * sensory organs of taste * sensory organs of smell * sensory receptors located in the skin, joints, muscles, and other parts of the body Nervous System Disorders. What should you know about the human brain? You should know its structure, functions, and disorders. Here are further guidelines. |