What is the primary function of melanin?

A. Striated muscle:Striated muscle refers to muscle with a banded appearance and includes skeletal and cardiac muscle; it is not the typical involuntary muscle of hollow organs.
B. Cardiac muscle:Cardiac muscle is involuntary and striated but is specific to the heart rather than the walls of most hollow organs.
C. Smooth muscle:Smooth muscle is non-striated, involuntary, and forms the walls of hollow organs (for example blood vessels, the gastrointestinal tract, and the bladder).
D. Skeletal muscle:Skeletal muscle is striated and under voluntary control, primarily attached to bones for movement.

A. Dermis:The dermis contains blood vessels and many inflammatory responses that produce redness and swelling and is involved when inflammation extends below the epidermis.
B. Hypodermis:The hypodermis (subcutaneous layer) contains adipose tissue and larger vessels; involvement here indicates deeper inflammation than what is described as superficial.
C. Subcutaneous tissue:Subcutaneous tissue is synonymous with the hypodermis and indicates deeper involvement rather than a superficial process.
D. Epidermis:The epidermis is the most superficial layer of the skin and is affected in superficial inflammatory conditions such as dermatitis or mild contact irritation.