32.3 the integumentary system

helps to produce vitamin D

• nails

• skin

• hair

The skin has many different functions, but its most important function is

The skin forms a ........ that blocks out pathogens and debris

Hair also helps to prevent ....... from the head.

...... contains waste products such as urea and salts that need to be excreted from the body.

The..... serves as the gateway through which sensations such as pressure, heat, cold, and pain are transmitted from the outside environment to the nervous system.

...... is needed for the adequate absorption of calcium and phosphorus from the small intestine.

........... is needed for one of the chemical reactions that produce vitamin D in skin cells.

The skin is made up of .......main layers

• two

• three

• four