HEALTH SCIENCE 12 UNIT TWO : Human Anatomy-Structure & Physiology - Function
Levels of Organization Chemical Cellular Tissue Organs Organ System Organism
I) BODY POSITIONS: A) ANATOMICAL POSITION
B) SUPINE POSITION: Lying with face up or when referring to hands, palms up or forward.
C) PRONE POSITION: Lying with face down, or when referring to hands with palms back and back of hand showing
II) ANATOMICAL PLANES/sections
Name These Body Planes
III) ANATOMICAL DIRECTIONS :
CAREFUL of “MEDIAL” vs “MEDIAN” !!!
Because humans stand upright, our ventral (belly) is our front (anterior. Our backside (Dorsal) is also our behind ( Posterior)
DEEP vs. SUPERFICIAL
RIGHT vs. LEFT ? ?
VIDEO SUMMARY https://www.youtube.com/watch?v=kvHWnJwBkmo
WHAT DO YOU KNOW ? The diaphragm is _________ to the lungs The nose is on the ____________ surface of the head. The fingers are __________ to the wrist bones Your baby toe is ___________ to your big toe Your Humerus bone is __________ to the Biceps Brachii muscles. Name something that is CRANIAL to your right eye.
What Plane was this MRI image taken on?
State Planes that each A and B (CT Scans) were taken on
Brain illustration is on what Section ?
BODY CAVITIES Cavities are open spaces enclosed in the body, that houses (filled up with) organs. These cavities are named according to their positions in the body.
BODY CAVITIES
BODY DIVISIONS & REGIONS
BODY REGIONS
HOMEOSTASIS = “Same Standing” Keeping things in balance: “A Dynamic State of Equilibrium” Factors to keep in check: Temperature, Oxygen levels, Ion concentrations, Hormone levels, Blood Sugar, Blood pH etc, etc.
NEGATIVE Feedback Loops In this case “NEGATIVE” refers to the act of NEGATING (cancelling out) something
Components of Feedback Loop Receptor monitors a controlled condition Control center determines next action Effector receives directions from the control center produces a response that changes the controlled condition
THERMOREGULATION
Thermoregulation
Eg. Homeostasis of Blood Pressure Pressure receptors in walls of certain arteries detect an increase in BP blood Pressure = force of blood on walls of vessels Brain receives input and signals heart and blood vessels Heart rate slows and arterioles dilate (increase in diameter) BP returns to normal
Eg.Positive Feedback during Childbirth Stretch receptors in walls of uterus send signals to the brain Brain releases hormone (oxytocin) into bloodstream Uterine smooth muscle contracts more forcefully More stretch, more hormone, more contraction etc. Cycle ends with birth of the baby & decrease in stretch