Hair, Nails, and Glands of the Integumentary System

The lunula is the white-ish half-circle area near the base of the nail. Why is it lighter in color than the nail body?

• Because the cells under the lunula are dead.

• Stratum basale produces a white-ish pigment.

• Thickened stratum basale obscures underlying blood vessels.

• Because the nail is 10x thicker in that area.

In a nail, where does growth occur?

• Nail matrix

• Nail body

• Nail bed

• Nail plate

Which part(s) of a pilus is composed of dead epithelial cells?

• Hail bulb

• Root

• Shaft

Which part of the pilus is responsible for hair color?

• Hair medulla

• Hair cortex

• Hair matrix

• Arrector pili

Tags

NGSS.HS-LS3-2

The secretion of a merocrine versus an apocrine sweat gland is...

• The secretion is the same, its the location that is different.

• Proteins and lipids versus 99% water and 1% chemicals

• 50% water and 50% chemicals versus proteins and lipids.

• 99% water and 1% chemical versus proteins and lipids

What is the major function of a merocrine sweat gland?

• Protection from the external environment.

• Regulate body temperature.

• Heat retention.

• Immune protection.