What is physiology Flashcards
what are the different levels of physiological organization
Molecules, cells, tissue, organs, organ systems
what are the four major cell/tissue types
neurons/nervous tissue, muscle cells/tissue, epithelial cells/tissue, connective tissue/cells
what do neurons/nervous tissue do?
specialized for sending and receiving information
what do muscle cells/muscle tissue do
specialized for contraction
where are epithelial cells/tissue found?
found on organs, glands, and lining body cavities
what are Endocrine glands
secrete molecules (usually hormones) directly into the bloodstream (ex: pancreatic and thymus glands)
what are exocrine glands
utilize a duct and secrete molecules into a body cavity or to the exterior of the body (ex: stomach, salivary, sweat glands)
what qualifies as a connective tissue cell
bone cells, body cells, fat cells, etc
how are connective tissue cells characterized
by very few and lots of extracellular materials
define homeostasis
the ability to maintain a relatively stable internal environment despite fluctuations in the external environment
why is homeostasis so important
it is essential for survival and function of all cells
if there is a deviation from homeostasis, what does this indicate
disease
how is homeostasis accomplished (most often)
negative feedback
what does negative feedback involve
returning internal conditions to a “set point”
what does a negative feedback loop help do
it helps return internal conditions to a set point when they deviate too far outside of an acceptable range
