A dark brown pigment produced by some cells of the epidermis:

An individual muscle cell is often referred to as a:

Number of thoracic vertebrae:

Releases calcium ions into the myofibril:

Cells in this layer of the skin are actively growing and reproducing.

Acetylcholine will be received by a skeletal muscle cell at the:

Cells responsible for the formation of the myelin sheath.

All glands that release their products by way of ducts, rather than directly into the bloodstream, are called _____ glands.

Largest of the white matter commissures, it interconnects most of the cerebral cortex:

Arrector pili are muscles best associated with: