Celll a&p Flashcards
smallest structural units of living things
- vary considerably in size; all microscopic
- different shapes
cells
composed of thin 2 layer membrane of phospholipids and embedded with protein
- form outer layer cell
- is selectively permeable
plasma membrane
all organisms composed of cells and cell
modern cell theory
cells 3 major parts
- plasma membrane
- organelles
- cytoplama
a group of small structures that make up the cytoplasm
-“lil organs “
organelles
short extension of the plasma membrane that increase surface area
microvilli
microscopic hairlike projections
- can be sensory
- protect/ movement
cilia
tail on a cell ( acts like a motor & rubber )
- use for sperm
flagella
movement of water down concentration gradient
osmosis
movement of particles down a concentration gradient
High to low
diffusion
movement of cells or other large particles into cell by trapping it in a section of plasma membrane that pinches off inside the cell (“ cell eating”)
phagocytosis
Solution has a lower concentration of a non-permeating solution than ICF
Absorb water
Hypotonic
Solution is one with a higher concentration of a non-premeeting solution then the I CF
Lose water
Hypertonic
o two solutions having the same osmotic pressure across a semipermeable membrane. This state allows for the free movement of water across the membrane without changing the concentration of solutes on either side.
Causes no changes in the cell volume or shape
Isotonic
Process of engulfing large particles by means of pseudopods “ cell eating “
Phagocytosis