Bio 2/23

Homeostasis

Homeostasis

balance of an organism/cell maintains in it’s environment

feedback mechanism

used to get organism/cell to homeostasis

Positive feedback mechanism

more, more, more or less, less, less until a goal is met

negative feedback mechanism

keep it steady. ex/ body heat

passive transport

no energy need, high concentration to low

simple diffusion

movement of molecules from high concentration to low without any barriers and without need for energy

diffusion across membrane

the molecule needs to be oily, hydrophobic, non-polar

facillitated diffusion/ carrier transport

across a membrane (protein)

isotonic

same %solutes in solution as compared to in the cell

hypertonic

higher %solutes in solution as compared to in the cell “low turgor pressure”

Plasmolosis

cell shrinks

hypotonic

lower %solutes in solution as compared to in the cell “high turgor pressure”

cytolosis

cell burst

active transport

needs energy, low concentration to high

ion channels “pumps”

in the proteins, uses nerves and muscles

bulk transport

the transport of massive amounts

endocytosis

bulk items entering

exocytosis

bulk items exiting

phagocytosis

large, (engulf), cell eating

pinocytosis

small, cell drinking

receptor medicated

“locks to key”