Chapter 1 Flashcards
Effector
receives output from control center and provides the means to respond
Negative Feedback
response reduces or shuts off original stimulus
Positive Feedback
response enhances stimulus
Most-used feedback mechanism in body
negative feedback
Examples of Negative Feedback
regulation of body temperature or blood glucose by insulin
Positive Feedback
controls infrequent events that do not require continuous adjustment
Examples of Positive Feedback
labor contractions by oxytocin or platelet plug formation and blood clotting
Sagittal plane
divides body vertically into right and left parts
Midsagittal (median) plane
cut was made perfectly on midline
Frontal (coronal) plane
divides body vertically into anterior and posterior parts
Transverse (horizontal) plane
divides body horizontally into superior and inferior parts
produces a cross section
Mediastinum
contains pericardial cavity and surrounds other thoracic organs
Parietal serosa
lines internal body cavity walls
Visceral serosa
covers internal organs
Pericardium
heart
