Exercise 5A The Cell: Transport and Membrane Permeability.

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Presentation transcript:

Exercise 5A The Cell: Transport and Membrane Permeability

There are two general categories of cellular transport mechanisms:

Passive Simple diffusion Facilitated or protein mediated Filtration Osmosis Active ATP driven solute pumps Vesicular Endocytosis Phagocytosis Bulk-phase endocytocysis (pinocytosis) Phagocytosis Types of transport

Rate of diffusion is influenced by: concentration temperature molecular or atomic weight of solute density of solvent gases allow for the quickest liquids are intermediate solids allow for the slowest

Diffusion

Diffusion of dye in agar KMnO 2 Methylene blue

Facilitated diffusion

Osmosis a.

Osmosis b.

What’s an “Osmometer”?

Normal erythrocytes in an isotonic solution

RBCs in hypertonic saline solution: crenation

Isotonic vs hypotonic Normal RBCs: 0.9% NaCl Hemolysis: Distilled water

Active transport requires cellular energy

Exocytosis

Endocytosis (a.k.a. pinocytosis)

Phagocytosis: cellular eating

Active transport: Antiport The sodium/potassium pump

Active transport: Symport The sodium/glucose symporter

Transport Animations