Cells and Their Environment - rowan.k12.ky.us

Cells and Their Environment - rowan.k12.ky.us

Cells and Their Environment Chapter 4 p 74-84 Homeostasis

A biological balance Cells, tissues, organs, and organisms must maintain a balance. Cells do so by controlling and regulating what gets into and out of the cell.

Membrane Structure & Function Transport Passive

Active Transport that does not require chemical energy to occur

ie: diffusion and osmosis The movement of any substance across a cell membrane with

the use of chemical energy ie: Na+/K+ pump DIFFUSION

Process by which molecules spread from an area of high concentration to an area of low concentration Concentration gradient:

a difference in the concentration of a substance ***Molecules are in constant motion

Osmosis Diffusion of water through a membrane from an area of high concentration to an

area of low concentration. http://highered.mcgraw-hill.com/sites/0 072495855/student_view0/chapter2/ani mation__how_osmosis_works.html

HYPOTONIC Concentration of solute molecules in the environment outside of the cell is lower than that in

the cell. Water moves in Red blood cell Hypertonic

Concentration of solute molecules outside the cell is greater than that in the cell Water moves out

Isotonic Concentration of solute molecules outside cell and inside are equal. **equilibrium

Think about it What happened if you eat salty foods? Why do you gargle warm salt water if you have a sore throat? Why do athletes need to have electrolytes in

their drinks? Grass wilts if you add too much fertilizer WHY? http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter14/ animation__the_nerve_impulse.html

Requires Energy: ex.: thyroid gland concentrates Iodine glucose is completely absorbed by digestive tract

http://highered.mcgraw-hill.com/sites/0072495855/ student_view0/chapter2/ animation__phagocytosis.html Exocytosis

Ex. LDL cholesterol (bad cholesterol) http://highered.mcgraw-hill.com/olc/dl/120068/ bio02.swf

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