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.

Vesicle Fusion with Cell Membrane

Phagocytosis & Pinocytosis “cell eating” “cell drinking”

*Special types of endocytosis.*

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/