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the immune system
The Human Immune System ~ Part I & Part II
The central nervous system, which is protected by the spinal column and the cranium, controls the function of all the cells, tissues and organs of the human body.
The spine and its nerves. Nerve supply channels and where they reach to in the body: Cervical Vertebrae, Thoracic vertebrae, Lumbar Vertebrae, Sacral Vertebrae
Nervous system connection www.DrHardick.com
Heart strings (tendons) inside the human heart.