8.3 Cell Transport

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Lesson Overview8.3 Cell Transport

Lesson OverviewCell TransportPassive TransportThe movement of materials across the cell membrane without usingcellular energy is called passive transport.

Lesson OverviewCell TransportDiffusionThe process by which particles move from an area of high concentration toan area of lower concentration is known as diffusion.- form of passive transport- particles move down the concentration gradient

Lesson OverviewCell TransportDiffusionHigh Conc.Low Conc.

Lesson OverviewDiffusionCell Transport

Lesson OverviewDiffusionCell Transport

Lesson OverviewCell TransportFacilitated DiffusionSome molecules that cannot directly diffuse across the membrane passthrough special protein channels in a process known as facilitateddiffusion.- protein channels are molecule specific- form of passive transport- particles move down concentration gradient

Lesson OverviewCell TransportOsmosis: An Example of FacilitatedDiffusionOsmosis is the diffusion of water through a selectively permeablemembrane.- water moves down concentration gradient- passive

Lesson OverviewCell TransportOsmosis: An Example of FacilitatedDiffusionHypertonic - higher concentration of solute; low concentration of solvent(water)Hypotonic - lower concentration of solute; high concentration of solvent(water)Isotonic - equal concentrations of solute

Lesson OverviewCell TransportHow Osmosis WorksHypotonicHypertonic

Lesson OverviewCell TransportHow Osmosis Works

Lesson OverviewCell TransportOsmotic PressureThe net movement of water in or out of a cell exerts a force known asosmotic pressure.

Lesson OverviewCell TransportOsmotic PressureBecause the cell is filled with salts, sugars, proteins, and other molecules, itis almost always hypertonic to fresh water. So if a cell is in fresh water, watertends to move quickly into the cell, causing it to swell or even burst.

Lesson OverviewCell TransportOsmotic PressureIn plants, the movement of water into the cell causes the central vacuole toswell, pushing cell contents out against the cell wall.

Lesson OverviewCell TransportOsmotic PressureCells in an isotonic solution experience no net gain or loss of water.

Lesson OverviewCell TransportOsmotic PressureIn a hypertonic solution, water rushes out of the cell, causing animal cells toshrink and plant cell vacuoles to collapse.

Lesson OverviewCell TransportActive TransportThe movement of materials against or up a concentration difference isknown as active transport.- requires energy (ATP).

Lesson OverviewCell TransportActive Transportactive transport of smallmolecules or ions happens viatransport proteins, or protein“pumps,” in the membrane.calcium, potassium, and sodiumions use this transport.- example: sodium potassiumpumpprotein shape changes areimportant in the process.

Lesson OverviewCell TransportActive Transport: Bulk TransportBulk Transport moves larger molecules and clumps of material across cellmembranes.- requires energy (ATP)- forms:1. endocytosisa. pinocytosisb. phagocytosis2. exocytosis

Lesson OverviewCell TransportEndocytosisprocess of taking material into the cell by vesicles or vacuoles

Lesson OverviewCell TransportEndocytosisTypes of endocytosis:1. phagocytosis - cytoplasm extensions surround a particle and package itwithin a food vacuole. The cell then engulfs it.Amoebas eat this way.means “cell eating”2. pinocytosis - cells form tiny pockets along the cell membrane.The pockets fill with liquid and pinch off to form vacuoles within the cell.means “cell drinking”

Lesson OverviewCell TransportExocytosismembrane of a vacuole fuses with the cell membrane, forcing the vacuolecontents out of the cell.

Lesson Overview Cell Transport Passive Transport. . Active Transport. The movement of materials . against or up . a concentration difference is known as . active transport. . Bulk Transport moves larger mo

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