Transport of substances across a membrane without any input of energy by the cell. a. Diffusion b. Osmosis.

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Presentation transcript:

Transport of substances across a membrane without any input of energy by the cell. a. Diffusion b. Osmosis

Moves molecules across the cell membrane from an area of LOWER concentration to an area of HIGHER concentration It requires cells to expend energy

Vesicles made by the cell fuse with the cell membrane, releasing their contents into the external environment

b. Endocytosis 1. Pinocytosis- vesicle contains fluids (cell drinking) 2. Phagocytosis- vesicles contain large particles or cells (cell eating)

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