Integumentary System

Question 1

Describe the structure + histological make up of the hair.

Answer 1

Made up of dead keratinized epidermal cells that are bonded together by proteins and has a shaft and root

Question 2

Describe the structure + histological make up of the skin.

Answer 2

Epidermis - superficial layer, thin, epithelial tissues (4 layers)
Dermis - deep layer, thicker, connective tissue (5 layers)

Question 3

Describe the structure + histological make up of the skin glands.

Answer 3

Sebaceous - most open into hair follicles, some directly onto the skin (ex. lips , genitals), release an oily substance called sebum (keeps hair from drying out, prevents water evaporation from skin, keeps skin soft and pliable and inhibits growth of some bacteria)

Sudoriferous (sweat) - release sweat into the hair follicles, or onto the skin surface

Question 4

Describe the structure + histological make up of the nail.

Answer 4

Plates of tightly packed dead keratinized epidermal cells
Made up of nail body, root and nail matrix

Question 5

What are the 5 functions of the integumentary system?

Answer 5

Protection - protects skin and underlying tissues, lipids released from lamellar glands, melanin absorbs harmful uv light, langerhans cells and macrophages assist in immunity.

Regulates - body temp

Eliminates waste - sweats

Helps make vitamin D

Cutaneous sensation - touch, pain and temp sensations