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Active Transport Molecules move across the
membrane AGAINST their concentration gradient
(Low to High)
ENERGY is required.
2 Types:
1. Protein Pumps
2. Bulk Transport LOW
HIGH
Protein Pumps Transport small molecules and ions AGAINST their
concentration gradients (LOW HIGH) using ATP (cell energy).
Bulk Transport Larger molecules (proteins,
starch) are transported by vesicles.
Endocytosis: vesicles move substances in.
Exocytosis: vesicles move substances out.
BrainPOP: Active Transport
http://www.brainpop.com/science/cellularlifeandgenetics/activetransport/preview.weml
Homeostasis The process by which an organism’s internal
environment is kept in equilibrium, or stable, in spite of changes in the external environment.
Examples:
Internal Temperature (sweating removes excess body heat)
Water Balance (kidneys adjust water amount in urine)
A physical response to stress (breathing & heart rate increases, pupils dialate, sweating)
Homeo = like or similar
Stasis = balance or equilibrium
BrainPOP: Homeostasis
http://www.brainpop.com/health/bodysystems/homeostasis/