Chapter I cont. Chapter I cont.

The Basics The Basics

Homeostasis Homeostasis Meaning: Balance or EquilibriumMeaning: Balance or Equilibrium

Control Mechanisms for Control Mechanisms for HomeostasisHomeostasis

Negative Feedback

Positive feedback

Negative Feedback Negative Feedback Think of an INTERNAL THERMOSTAT

To To HOTHOT?? To To COLDCOLD??

EXAMPLE:EXAMPLE:

Positive Feedback Positive Feedback Pretty RARE in the Body but happens

Example:

Blood Clotting Child birthing

Now Lets go test it Now Lets go test it out!!!!out!!!!

No not the Blood Clotting or Child Birthing

Body PlanesBody Planes

Median = Midsagittal Frontal TransverseThink:Cross section

Directional Terms and Directional Terms and Orientation Orientation

Directional Terms and Directional Terms and OrientationOrientation

Directional Terms and Directional Terms and OrientationOrientation

Body CavitiesBody Cavities

Lets see what you Lets see what you learnedlearned

If the chest is ventral and the spine If the chest is ventral and the spine is dorsal, what plane am I?is dorsal, what plane am I?

Frontal

Lets see what you Lets see what you learnedlearned

A ninja (lets call him me) gets the drop on A ninja (lets call him me) gets the drop on you ~damn it~, and cuts off your leg off, you ~damn it~, and cuts off your leg off, perfectly left to right <-----> horizontally. perfectly left to right <-----> horizontally.

What plane am I?What plane am I?

Transverse

Lets see what you Lets see what you learnedlearned

You’re in Boston, walking along a building You’re in Boston, walking along a building with glass windows. One of the windows falls with glass windows. One of the windows falls out (straight down), cuts your whole face off out (straight down), cuts your whole face off and you die. and you die.

What plane am I?What plane am I?

Frontal

Lets see what you Lets see what you learnedlearned

Wesley Snipes is psychotic and thinks he really Wesley Snipes is psychotic and thinks he really is BLADE!! He finds you running for your life. He is BLADE!! He finds you running for your life. He takes his sword (he stole from the movie) and takes his sword (he stole from the movie) and cuts your head in two. Right down the center. cuts your head in two. Right down the center.

What plane am I?What plane am I?

Medial

Lets see what you Lets see what you learnedlearned

Your at Camp Crystal Lake, its late Your at Camp Crystal Lake, its late and dark. A hatchet wielding nut job and dark. A hatchet wielding nut job comes out of the bushes, runs you comes out of the bushes, runs you down and sinks his axe into your down and sinks his axe into your spine!spine!

What side of the body is his axe in?What side of the body is his axe in?

Dorsal or Posterior

Lets see what you Lets see what you learnedlearned

Your cliff-diving and you hit the rocks Your cliff-diving and you hit the rocks going 90 miles an hour! Your brain is going 90 miles an hour! Your brain is crushed and looks like paste. crushed and looks like paste.

What cavity have you ruptured?What cavity have you ruptured?

Cranial

Lets see what you Lets see what you learnedlearned

You get into an argument with your You get into an argument with your friend and he’s getting stupid so you friend and he’s getting stupid so you kick him in the JUNK.kick him in the JUNK.

What cavity does he feel the pain?What cavity does he feel the pain?

Pelvic

Lets see what you Lets see what you learnedlearned

You’re walking ~alone~ in grassy field in You’re walking ~alone~ in grassy field in war-torn Africa. Watching for rebel war-torn Africa. Watching for rebel insurgents. You’ve just stepped on a land insurgents. You’ve just stepped on a land mine and shrapnel blows you in half, mine and shrapnel blows you in half, leaving your guts (intestines) hanging like leaving your guts (intestines) hanging like ropes in dirt!!!ropes in dirt!!!What cavity do you now “What cavity do you now “issues”issues” with? with?

Abdominal