Chapter 1:4- 1.6 Flashcards
(24 cards)
anatomical positon
hands to the sides with palms facing forward and feet together
why anatomical position?
serves as the reference position for all other terms and movements
supine
laying down in the anatomical position face up
prone
laying down in the anatomical position face down
anterior/ventral
toward the front of the body
posterior/dorsal
toward the back of the body
superior
close to the head
inferior
close to the feet
medial
middle of the body
lateral
farther away from the middle
superficial
on the outside
deep
on the inside
proximal
closer to the point of attachment
distal
farther from the point of attachment
coronal/frontal planes
vertical plane that separates anterior from posterior
midsagittal
vertical plane down the midline dividing the body into equal left and right halves
sagittal
dent directly run down the midline and results in unequal left and right halves
transverse/horizontal plane
plane is perpendicular to the long axis and separated superior from inferior
homeostasis
ability to maintain constant internal environment or steady state
what happens if theres a failure to maintain homeostasis
results in illness or death
negative feedback
effector activation opposes or negates the original stimulus which disturbed homeostasis
Example with body temperature
receptors in the skin and brain identify a disturbance and relays the info to the control center, the hypothalamus in the brain receives the the signal from the receptors and relays it to the effectors. blood vessels dilate to increase blood flow near body surface and sweat glands secrete sweat. homeostasis is then restored
positive feedback
stimulus is reinforced until a climate event occurs
example with blood clotting
damaged cells release chemicals to begin clotting, chemicals start a chain reaction here cell fragments and soluble proteins begin to clot/ as clotting continues each step releases chemicals that further accelerate the process. clotting escalates until clot patches vessel wall and stops bleeding