What are the five senses? TouchSightHearingTasteSmell

What organ system controls the sense of Touch? The Integumentary System

What is in the Integumentary system? SkinHairNails

What is the skin? The largest organ in the body Protective Has many types of sensory receptors.

Protective The skin keeps water in Keeps dirt and bacteria out When you are cut, can grow back closing the cut.

Temperature control The skin helps regulate the bodies temperate Does this in two ways

#1 : Cool the body Route blood near the surface Lift hairs sweat

#2 : Heat the body Route blood away from the surface Pulls hairs down Cause muscles to shake

What allows the skin to sense? Receptors

5 types of receptors PainColdHeatPressureVibration

#1 : Pain receptors Most important receptor Lets the brain know the body is hurt Very close to the top of the skin

#2 : Cold receptors Separate Heat & Cold receptors Deep in the skin

#3 : Heat receptors Separate Heat & Cold receptors Near the surface

#4 : Pressure receptors Feels contact Lets us know if we are in contact with something Close to the surface

#5 : Vibration Receptors Feels shaking & vibrations Good to find food & not become food Near the surface

How does the Skin & the Brain work together ? Feedback mechanisms

What is a feed back mechanism? Four steps

#1: The brain gives an order Example: The brain tells the skin to sweat.

#2: The organ does the Brain’s order Example: The skin to sweats.

#3: The organ sends information to the brain Example: The skin tells the brain it is getting cold.

#4: The brain gives a different order Example: The brain tells the skin to stop sweating.

Homework   Due Tuesday: Homework: Page 620 #1.a.b.c. & #2.a.b.c.     Due Thursday:   1) Brain Diagram   2) Pg. 525 #1.a.b.c., 2.a.b.     Due Friday:   1) Four Vocab: Integumentary system, Stimulus, Medula, Cerebrum  