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Chapter #6 TRANSPORT NOTES. TRANSPORT is the INTAKE and DISTRIBUTION of materials throughout an organism. Transport occurs 1. Across membranes of cells 2. Within the cell itself called CYCLOSIS 3. Between parts of Multicellular Organisms .

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slide1

Chapter #6 TRANSPORT NOTES

TRANSPORT is the INTAKE and DISTRIBUTION

of materials throughout an organism.

Transport occurs 1. Across membranes of cells

2. Within the cell itself called CYCLOSIS

3. Between parts of Multicellular Organisms

slide2

Structure of the Cell Membrane

  • (FLUID MOSAIC MODEL)

The cell membrane consists of two layers of lipid molecules

where protein molecules are embedded in the lipid bilayer

  • Phospholipid Molecule
  • contains:
  • The Head; Phosphorous
  • and O2
  • b. The Tail: Carbon and
  • Hydrogen
slide3

B. Function of the Cell Membrane

Regulates the movements of materials that enter

and exit the cell.

Also know assemi-permeable, selectively permeable

Characteristics that allow materials to move

through the membrane

Size and Electrical Charge of Molecules

slide4

Types of Transport

Passive Transport: no energy (ATP) required to move

materials through the membrane

Active Transport: the cell supplies energy (ATP) to

move materials through the membrane

These ideas are based on the concept of moving

materials across cell membranes

slide6

1.Diffusion: random movement of molecules or ions.

From an area of __HIGH____concentration to

an area of _____LOW_______ concentration.

2. Osmosis: the diffusion of water through a membrane.

slide8

The difference in concentration of molecules

on each side of the membrane is called Concentration

Gradient.

HIGH

LOW

slide9

ACTIVE TRANSPORT

Molecules pass from a region of ____LOW______

concentration to a region of _____HIGH_______

concentration.

THIS REQUIRES ENERGY…ATP

slide10

PINOCYTOSIS the transport of large protein molecules

or very small dissolved particles.

Occurs by the formation of POCKETS by the cell

Membrane called a PINOCYTIC VESICLE. Large

molecules are transported across the cell membrane.

slide11

PHAGOCYTOSIS engulfs large chunks of undissolved

matter. Most unicellular organisms (ameba)

See video next page

slide13

THE MOVEMENT OF MATERIALS

CIRCULATION is the transport of materials within

cells or between parts of a multicellular organism.

Examples include:

1. CYCLOSIS the streaming movement

of cytoplasm

See video next page

2. DIFFUSION

3.Use of the ENDOPLASMIC RETICULUM

slide15

***NEED TOKNOW***

PLASMOLYSIS the shrinking of the cell membrane

due to outward movement of water

slide16

Question:HOW DOES THE SIZE OF CELL MEMBRANES

CHANGE?

Answer: TYPES OF SOLUTIONS

1. Isotonic

This results in no net movement of water

into or out of cells.

2. Hypertonic

This results, in a net movement of water

out of cells.

3. Hypotonic

This results in a net movement of water

into cells.