Passive and Active Transport

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Presentation transcript:

Passive and Active Transport Cell Membranes Passive and Active Transport

Vocabulary ( Passive transport) Passive Transport-The movement of materials across the cell membrane without using cellular energy. Concentration Gradient- region along which the density of a chemical substance increases or decreases. Diffusion- particles move from an area of high concentration to an area of low concentration. Osmosis- Water crossing a selectively permeable membrane. Hypotonic-Below strength ( solute) Hypertonic-Above strength ( solute) Isotonic-Same strength ( solute) Aquaporin- Channel proteins that allow water to pass through cell membranes

Vocabulary Passive Transport Diffusion Facilitated Diffusion Osmosis Aquaporin Isotonic Hypertonic Hypotonic

Visual (press word link for video) DIFFUSION

Facilitated Diffusion Protein Channel Activity The net movement is DOWN the concentration gradient. ( PASSIVE)

Facilitated Diffusion Still no energy on the part of the cell! One example is aquaporins, which allow water to transport over the cell membrane. Knowing what you know about the structure of the membrane, why might water have a hard time with direct crossing?

Facilitated Diffusion Osmosis Osmosis Activity

Vocabulary ( Active Transport) Active Transport- Against the concentration gradient, requires energy from the cell. Protein Pump Endocytosis Exocytosis

Active transport Pumping a solute across a membrane against its gradient requires work. Cells expend energy most often in the form of ATP. Active Transport

Bulk Transport Vesicles are “packaged” in the Golgi, and sent off for shipping. Endo and Exocytosis But just how do you think the vesicles get to the membrane? Motor Proteins! ( you aren't required to know this, but this is just awesome ) https://www.youtube.com/watch?v=FzcTgrxMzZk [5:30-6:35]

Bioflix and Assessment Passive, Active, and Endocytosis and Exocytosis [Recap] BIOFLIX AND QUIZ