Agenda 10/21 and 10/22 1. Turn in: Vocab #8 2. New Entry “Cell Transport and Homeostasis” 3. Notes on Cell transport 4. Concept Map Homefun: a. None! b.

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Presentation transcript:

Agenda 10/21 and 10/22 1. Turn in: Vocab #8 2. New Entry “Cell Transport and Homeostasis” 3. Notes on Cell transport 4. Concept Map Homefun: a. None! b. Study for your test, study vocabs #6,7,8 Copyright Pearson Prentice Hall

Cell Transport & Homeostasis Key Terms Biology Unit 04 Lesson 02

Semi-permeable Allowing certain substances to pass through Cell membrane is semi-permeable, it allows certain substances to cross but not others

Homeostasis Regulation of an organism’s internal environment in order to maintain conditions suitable for survival Happens on the organism and cellular level

Passive Transport Movement of substances across the cell membrane that does not require energy from the cell (high concentration to low concentration)

Passive Transport: Diffusion Cell Membrane Inside Cell Outside Cell Solutes Higher concentration of solute on one side of the membrane than the other Diffusion causes net movement of solute particles toward side of membrane with lower concentration. At equilibrium, particles move equally in both directions, so there is no net change.

Diffusion Movement of particles from an area of higher concentration to an area of lower concentration Type of passive transport

Facilitated Diffusion Substances cross the cell membrane with the help of special carrier proteins Type of passive transport

Osmosis Diffusion of water from an area of higher concentration to an area of lower concentration

Hypotonic Solution A solution or environment surrounding a cell that has less dissolved solutes and more water than the cell This type of solution will cause water to move into the cell via osmosis, resulting in swelling of the cell

Hypertonic Solution A solution or environment surrounding a cell that has more dissolved solutes and less water than the cell This type of solution will cause water to move out of the cell via osmosis, resulting in shrinking of the cell.

Isotonic A solution or environment surrounding a cell that has the same amount of dissolved solutes and the same amount of water as the cell

Active Transport Movement of particles across a membrane to an area of higher concentration, which requires energy

Ion or Protein Pump Proteins that are able to transport ions across the cell membrane from low to high concentration by changing their shape which requires ATP (energy) from the cell Example: sodium-potassium pump (important in nerve responses)

Endocytosis Cell brings in a bulky substance from its surroundings by wrapping its membrane around the substance and forming a vesicle Ex: White blood cells “eat” bacteria using this process.

Exocytosis Cell releases substances by merging a vesicle with the cell membrane and releasing the substances into the fluid around the cell Ex: cell releases waste products

Passive Transport: Osmosis aquaporin water cell membrane sugar

Osmosis

Osmosis in Cells Isotonic HypertonicHypotonic

Active Transport Protein pumpsEndocytosisExocytosis

Endocytosis

Active Transport vs. Diffusion Compare and contrast active transport and diffusion.