teas science - integumentary

integumentary system - structure

consists of hair, skin, nails, and glands

integumentary system - glands

• sebaceous - originates in dermis; secrete sebum onto hair emerging from hair follicle

• sudoriferous - gland producing sweat

• ceruminous - produces earwax; only found in dermis of ear canal

integumentary system - apocrine vs eccrine sweat gland

apocrine - assoc. w hair follicles, producing secreation w an odor

eccrine - originating throughout the dermis of body; sereats sweat and used for regulatiion of body temp

integumentary system - 3 layers of skin

• epidermis (top layer) - provides waterproof barrier and portects body from infection

• dermis (middle layer) - contains blood vessels, nerves, hair follicles, and sweat glands

• subcutanous (innermost layer) - consists of fat and connective tissue

integumentary system - functions

• protection: skin portects from harmful substances, uv rays, and excessive water loss

• excretion: sweat glands help to regulate body temp by porducing sweat

• sensation: nerve endings allow us to feel touch, pressure, heat, and cold

integumentary system - homeostasis

maintains homeostasis by regulating body temp and fluid balance

• too warm, blood vessels dilate and sweat to cool body

• too cold, blood vessels constrict and produce less sweat to maintain heat (cutaneous vasoconstriction)

integumentary system - melanocytes

produce melanin and protect from uv radiation

layers of the epidermis

• Stratum basale (deepest layer)- contains melanocytes (produce melanin) and Merkel cells (touch receptors).

• Stratum spinosum - Provides skin strength and flexibility.

  • Contains immune cells called Langerhans cells.

• Stratum granulosum - Acts as a waterproofing barrier.

• Stratum lucidum (only in thick skin, like palms and soles) - Provides extra protection.

• Stratum corneum (outermost layer) - Protects against pathogens, UV radiation, and water loss.

  • Constantly shed and replaced.

Which system works most closely with the integumentary system to help regulate body temperature?

Nervous system

Which part of the integumentary system acts as a barrier to pathogens?

Sebum