2 - Intro to Physiology Flashcards
What is homeostasis
Ability to maintain the internal environment within narrow limits
What are the building blocks of the cell
Molecules
Molecules act as sources of (3 different things)
(1) Sources of energy (2) Serve in recognition (3) Build larger structure
What 4 ways can the body signal about the environment
(1) Nervous system (2) Endocrine System (3) Autocrine (4) Paracrine
Extra Cellular Fluid (ECF) composed of
Vascular and Interstitial Fluids
Equilibrium
no net change and no dissipation of energy
Steady State
no net change but requires the continuous input of energy
In Steady state
the rate of inflow matches the rate of efflux, but there is flux through system
Homeostasis is
a mechanistic process by which a given parameter oscillates around an ideal value (set point)
What is the mechanism by which homeostasis is maintained
Feedback control systems
Negative Feedback Systems, the response generated by the effector does what
Acts to oppose/remove the stimulus and the parameter returns back towards its setpoint
Positive Feedback, the response aims to do what
Response acts to bring the system further from its set point
Tonic activity means to maintain
some baseline level of activity greater than zero
Antagonistic control refers to
two different control mechanisms that induce opposite effects
What determines how a cell will react given a certain chemical signal
Presence of a specific type of receptor that allows a cell to respond in a certain way
