Where do our nails and hair come from?

What is an appendage in the integumentary system?

• A. A type of muscle

• B. A type of skin cell

• C. A classification that includes nails and hair

• D. A type of bone

Where is the nail root attached in the integumentary system?

• D. Subcutaneous fat

• C. Epidermis

• B. Hypodermis

• A. Dermis

What is the main component of the nail in the integumentary system?

• C. Keratin

• D. Elastin

• B. Melanin

• A. Collagen

How much faster do fingernails grow compared to toenails in the integumentary system?

• D. Five times as fast

• C. Four times as fast

• B. Three times as fast

• A. Twice as fast

Where does hair grow from in the integumentary system?

• C. Hypodermis

• A. Epidermis

• B. Dermis

• D. Subcutaneous fat

What is the main protein found in the cells of the hair in the integumentary system?

• D. Elastin

• C. Keratin

• B. Melanin

• A. Collagen

What is the rate of hair growth per month in the integumentary system?

• A. 0.25 inches

• D. 1 inch

• B. 0.5 inches

• C. 0.75 inches

Where is the arrector pili muscle located in the integumentary system?

• A. Epidermis

• D. Subcutaneous fat

• C. Hypodermis

• B. Dermis

What happens when the arrector pili muscle contracts in the integumentary system?

• A. Skin becomes smoother

• C. Hair falls out

• B. Goose bumps appear

• D. Skin becomes warmer

Why is the arrector pili muscle considered a vestigial structure in humans in the integumentary system?

• D. It is a type of skin cell

• C. It is a type of muscle

• B. It is a type of bone

• A. It is no longer functional