Question

how do nails help the human body? provide protection for the of the hands and feet and act ols for handling small objects
glands how do glands help the integumentary system?
answer here
why does the human body have hair? humans have hair for thermoregulation and protection from environmental elements like sun, etc.

Explanation:

Glands in the integumentary system secrete substances like sweat and sebum. Sweat glands help regulate body temperature through sweating, and sebaceous glands secrete sebum which lubricates the skin and hair, protecting them from drying out and also has some antibacterial properties.

Answer:

Glands in the integumentary system secrete sweat (for thermoregulation) and sebum (for lubrication and protection of skin and hair).