Integumentary System

Epidermis

outermost layer of skin, bodies primary barrier against environmental hazards

Epidermis lacks..

Blood vessels

Stratum Corneum

outermost layer of epidermis contains dead keratin filled cells

Stratum Corneum is a tough barrier against?

water loss, pathogens, and physical damage

Stratum lucidum is found where?

thin layer found in thick skin, palm of hands and soles of feet.

Stratum Granulosum are

cells flattening, accumulating keratin

Stratum Spinosum provides

several layers of keratoniocytes, structural strength containing immune cells langerhans

Stratum Basale contains..?

melanocytes and merkel cells

What is the deepest layer of the epidermis?

Stratum Basale

Where does constant cell division occur?

In the Stratum Basale

What are the most abundant cells in the epidermis?

Keratinocytes

What cells produces melanin?

melanocytes

How do melanocytes work?

transfers pigment granules to adjacent cells

Melanin protects the skin from..?

UV radiation

What are sensory receptors for touch called?

Merkel Cells

What cells detects pathogens?

Langerhan cells

What cells in the integumentary system does immune defense?

Langerhan cells

How does langerhan cells trigger the immune defense?

Captures and processes external pathogens, migrates lymph nodes and triggers appropriate T-cell response

What is the middle layer of the skin?

Dermis

What does the dermis contain?

Connective tissues, sweat glands, sebaceous glands, hair follicles, blood vessels, and nerves

Where would u find nerve endings for touch, pain, and temperature?

Dermis layer

What are the layers of the dermis?

Papillary layer and Reticular Layer

What is the papillary layer?

loose connective tissue, can find fingerprints, capillaries, and sensory receptors

What is the reticular layer?

Dense irregular connective tissue; provides strength and elasticity

What are two different sweat glands called?

Eccrine and Apocrine

What does eccrine do?

regulate temp, and is the watery sweat

What does apocrine do?

Body odor, is the thicker sweat happens due to puberty

What do sebaceous glands do?

secrete oil, and lubricates the skin and hair

What produces hair?

Hair follicles

Blood vessels in dermis are essential for..

thermoregulation

What is vasodilation?

heat is being loss

What is vasoconstriction?

Heat is retained

What is the deepest layer of the skin?

Hypodermis

What layer helps with regulating body temp the most?

Hypodermis

What forms the CNS and PNS?

Nervous tissue

Nervous Tissues are composed of…?

Neurons

Nervous Tissues are responsible for

transmitting nerve impulses and glial cells