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1.16 Active Transport and Bulk Transport. Energy, Cells, and ATP ATP – adenosine triphosphate; a compound used as a source of energy in cells When ATP.

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Presentation on theme: "1.16 Active Transport and Bulk Transport. Energy, Cells, and ATP ATP – adenosine triphosphate; a compound used as a source of energy in cells When ATP."— Presentation transcript:

1 1.16 Active Transport and Bulk Transport

2 Energy, Cells, and ATP ATP – adenosine triphosphate; a compound used as a source of energy in cells When ATP releases a phosphate, energy is produced

3 Active Transport Active Transport – the movement of substances through a membrane against a concentration gradient using carrier proteins and ATP Against the concentration gradient means that it moves from an area of [low] to [high]

4 Sodium-potassium pump – an active transport mechanism that pumps Na + and K + ions into and out of a cell – Without this pump, your nerve and muscle cells won’t function properly – Pumps require ATP to operate

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6 Bulk Transport The movement of large quantities of materials into or out of the cell

7 Endocytosis Brings large amounts of material into the cell from the extracellular fluid

8 There are two forms of endocytosis: 1. Phagocytosis – bulk transport of solids into the cell – The cell membrane sends out finger-like projections called pseudopods that surround and enclose the particle in a vesicle that is within the cell’s cytoplasm – Such a vesicle is called a phagocytotic vesicle Macrophages use this to engulf harmful bacteria 2. Pinocytosis – bulk transport of liquids into the cell – Pinocytotic vesicle – a vesicle that is formed when cells engulf extracellular fluid by pinocytosis

9 Exocytosis The movement of large amounts of material out of a cell by secretory vesicles Secretory vesicles – the membrane sac containing substances that are transported out of a cell – The secretory vesicle fuses with the cell membrane and spills its contents into the extracellular fluid – Proteins produced in the rough endoplasmic reticulum are packaged into secretory vesicles by the Golgi apparatus and are transported out of the cell by exocytosis

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11 hill.com/olc/dl/120068/bio02.swf

12 Homwork Page 71 # 1-5


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