Warm up

• Please take out 10/15 & 10/18 warm up and your Chapter 6 reading worksheet

• When a cell takes in Oxygen and releases CO2 what is that called?

• What system supports softer tissue and provides a pathway for blood vessels and nerves?

• What is the difference between the central and peripheral nervous system?

Integumentary System

Skin

• Protective covering

• Regulates body temp

• Stops water loss

• Houses sensory receptors

• Excretes waste

Epidermis

• Outer most layer

• Composed of squamous cells

Shedding

• New skin formed in the dermis (underlying layer)

• As new layers form they are pushed farther from the nutrients in the dermis

• Keratin: a protein pumped into dead cells that hardens them

• Keratin filled cells are pushed to the surface and eventually flake off

Calluses and wrinkles

Melanin

• Melanocytes: cells in the epidermis that produce melanin

• Melanin absorbs UV radiation to prevent mutations and other damage.

• More melanin = darker skin

• Melanin production is determined by genetics

Warm up

• Please get out warm ups from 10/15, 10/18 and Chapter 6 reading work sheet

• Name the following regions– Head– The back of the knee– The belly button– The top of the foot – The middle of the chest

What does the Dermis contain?

• Blood vessels

• Nerve endings

• Hair Follicles

• Sebaceous glands

• Sweat glands

What does the dermis do?

Connect the epidermis to the body and provides it nutrients

What is the importance of the nerve endings?

Enables humans to feel and properly react to the outside world

Why are the blood vessels in the dermis so important?

Help regulate body temp

Supply nutrients to the epidermis

What do the sebaceous glands produce? What is it?

They produce Sebum which is an oil

Why is Sebum important?

Keeps the hair and skin soft, pliable, and waterproof

subcutaneous layer

Where is the subcutaneous layer?Beneath the Dermis

What is it composed of? Loose connective and adipose tissue

What is the importance of the adipose tissue? Help insulate: conserving heat as well as impeding the entrance of heat from the outside

What is a Follicle?

A tube like depression that contains the hair root

How is hair produced?

• Epithelial cells at the bottom of the follicle divide

• As they divide they move upward and eventually die

• Your hair is dead epidermal cells

Sweat Glands

• Excocrine glands• Sweat = water, salts,

urea, and uric acid (excretory function)

Temperature Regulation

What does skin do in response to a low body temp?The blood vessels in the dermis contract to reduce heat loss from the blood

What does skin do in response to elevated body temperature?

The Blood vessel dilate and sweat glands perspire

Picture from the book De Humani Corporis Fabrica by Andreas Vesalius 1543

What initiated interest in the human body?

•Discovered herbs and potions that could be used to treat common problems (still used today in what know as Holistic or Alternative medicine.)

• Our ancestors’ initial interest most likely concerned injuries and illness.

•Most healers relied heavily on superstition and notions about magic.

•However as the healer tried to help the sick they discovered useful ways of examining and treating the human body such as:

•Observes effects of injury (such as gang green)

•Noticed how wounds healed

•Examined dead bodies to determine causes of death

What kinds of activities helped promote the

development of Anatomy and Physiology? As techniques for accurate observations and performing careful experiments evolved, knowledge of the human body expanded rapidly. At the same time, early medical providers coined many new terms which did the following:

- named body parts

- described body part location

- explained body part function

Saturday Night live the Barber

://www.medievalists.net/2010/05/13/bloodletting-in-monastic-customaries/