The human body is asymmetrical. As a result, the left and right foot are not exactly the same size. While these differences are mostly unnoticeable, others may be more obvious. More » Science Human Anatomy

Some causes of a swollen right foot may be an injury, such as a sprained ankle or foot, lymphedema, or infection, according to WebMD. Blood clot and medication side effects are other possible causes of a swollen foot. Sw... More » Health Pain & Symptoms

Causes of sciatic nerve pain in the legs include lumbar spinal stenosis, degenerative disc disease, spondylolisthesis and pregnancy, according to WebMD. Other causes of pain from the sciatic nerve include being overweigh... More » Health Conditions & Diseases
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In the human body, a motor unit consists of a single motor neuron and all the skeletal muscle fibers it innervates. The axonal terminal of the motor neuron interfaces with skeletal muscle at the neuromuscular junction (N... More » Science Human Anatomy

Potassium, a major electrolyte and an essential mineral, can be found in all cells of the human body. The concentrations of potassium found outside of the body's cells are lower than those within. The differences in the ... More » Science Human Anatomy

The Crayola, Enchanted Learning and Activity Village websites offer free printable coloring pages of the human body. Activity Village provides links to printable PDFs, while Crayola provides the option to print with Prin... More » Science Human Anatomy

A tickle is the human body's involuntary response to a foreign stimulus contacting the skin. There is no conclusive evidence to suggest that this response is not present in everyone. More » Science Human Anatomy