Functions of Integumentary System

Question 1

The different types of protection (3)

Answer 1

1. Physical
2. Chemical
3. Biological

Question 2

Chemical Barriers

Answer 2

Skin secretion (acid mantle/dermicidin) & melanin (UV protection)
* Human Defensin : punches holes on bacteria (looks like sieves)
* Cathelicidins : released in large quantities by wounded skin (prevents infection)

Question 3

Biologic Barrier

Answer 3

• Immune response activated by lymphocytes, attacking foreign bodies/antogens (proteins).
• Includes: Langerhans’ cells and macrophages (second line of defense)
• Effective in immune system

Question 4

Physical Barrier

Answer 4

Layering of epidermis - keratin
* Phospholipid bilayer: lamellated granules (glycolipids), tight junctions, oil

Question 5

Body Temp Regulation

Answer 5

Regular body temp: 98.6F/37C
* Too hot -> vasodilate -> sweat
* Too cold -> vasoconstrict -> shiver

Question 6

Cutaneous Sensation

Answer 6

Receptors that respond to stimuli (pain, texture, etc.) arising outside the body (exocytosis)

Question 7

Metabolic Sensation

Answer 7

• Synthesis of Vit.D: UV light converts cholesterol into Vit.D, which is important in calcium absorption (microvilli lines digestive tract to promote absorption)

Question 8

Blood Resevoir

Answer 8

Areolar = about 5% of blood volume

Question 9

Excretion

Answer 9

Nitrogen containing wastes are eliminated from the body via sweat and urine.
* Eccrine sweat glans
*Salts