1.3 & 1.4 Cellular Membranes. Read & Consider 1.3.1 – 1.3.3 What do you know? What questions do you have?

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Presentation transcript:

1.3 & 1.4 Cellular Membranes

Read & Consider – What do you know? What questions do you have?

Cells are surrounded by water inside and out. Membrane behavior is dictated by interactions with water. Polar Nonpolar

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Read & Consider What do you know? What questions do you have? Compare and contrast diffusion and osmosis.

Diffusion: passive movement of particles from a region of high concentration to a region of low concentration.

Osmosis: passive movement of water molecules from a region of lower solute concentration to a region of higher concentration. Isite.lps.org

Simple Diffusion –there is no expenditure of energy in moving the molecules across the membrane. Facilitated Diffusion – larger molecules move passively through the membrane via channel proteins. sjcabiology.wikispaces.com

Molecules moving from low to high concentration must be actively moved. Kenpitts.net Video

A transport mechanism for the movement of large quantities. Exocytosis: vesicle membrane fuses with the plasma membrane. Endocytosis: a vesicle is formed by the in folding of the plasma membrane. Material Transport

o Phospholipid molecules can change places in the horizontal plane (creates fluidity). o Molecule exchange in the vertical plane DOES NOT occur (maintains integrity). Video

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Tissue or organs to be used in medical procedures must be bathed in a solution with the same osmolarity as the cytoplasm to prevent osmosis. Complete the exploration phase for the lab with the following aim: To determine the osmolarity of an unknown substance by bathing samples in hypotonic and hypertonic solutions.