Human Body Structure & Function Quiz

Functions of the Skin

• Acts as a protective barrier against pathogens, UV radiation, and physical damage.
• Regulates body temperature through sweat production and blood vessel dilation.
• Provides sensory information through receptors for touch, pain, and temperature.
• Aids in the synthesis of vitamin D when exposed to sunlight.

Composition of Hair

• Primarily composed of a protein called keratin, which also forms nails and the outer layer of skin.
• Made up of three layers: the medulla (innermost), cortex (middle), and cuticle (outer protective layer).
• Contains melanin, responsible for hair color, varying in amounts among individuals.

Ear and Balance

• The inner ear is responsible for hearing and maintaining balance.
• Contains the cochlea for sound processing and the vestibular system for balance.
• Includes structures like the semicircular canals, which detect head position and motion.

Key Components of the Eye

• Cornea: transparent front part that refracts light.
• Lens: adjusts shape to focus light on the retina.
• Retina: light-sensitive layer at the back of the eye where images are processed.
• Optic nerve: transmits visual information from the retina to the brain.

Main Function of Nails

• Protects the tips of fingers and toes from injury and trauma.
• Enhances fine motor skills and precise handling of objects.
• Contains keratin, providing strength and durability.