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Essential Standard Bio.1.2 Analyze the cell as a living system.

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Presentation on theme: "Essential Standard Bio.1.2 Analyze the cell as a living system."— Presentation transcript:

1 Essential Standard Bio.1.2 Analyze the cell as a living system.
Cell Transport Essential Standard Bio.1.2 Analyze the cell as a living system.

2 Cell Transport Movement of materials across cell membrane 2 Types:
Passive Transport Active Transport

3 Passive Transport Movement of substances across membrane without input of energy until equilibrium is reached With concentration gradient; high to low concentration 4 Types Diffusion Osmosis Facilitated Diffusion Ion Channels

4 Active Transport Movement of substances across membrane requiring input of energy Against concentration gradient; low to high concentration 3 Types Protein Pumps Endocytosis Exocytosis

5 Passive Transport - Diffusion
Movement of molecules Molecules are in constant motion Moves “down” concentration gradient Rate of diffusion depends on Size of molecule Type of molecule

6 Passive Transport - Osmosis
Diffusion of water Direction of osmosis depends on concentration of solutes on both sides of membrane Hypotonic solution Cytolysis Hypertonic solution Plasmolysis Isotonic solution

7 Osmosis Problems A cell which is 98% water is placed into a solution of 10% sucrose. What is the direction of the water movement?

8 Osmosis Problems A cell has 45% sodium concentration and is placed in a solution of 55% water concentration. What is the direction of the water movement?

9 Passive Transport – Facilitated Diffusion
Diffusion of larger molecules Use carrier proteins (integral) No energy required

10 Passive Transport – Ion Channels
Regulate flow of ions across membrane Ion-specific! Ions requiring ion channels: Na+, K+, Ca+, Cl-

11 Active Transport – Protein Pumps
Carrier protein that transports molecules against concentration gradient

12 Active Transport - Endocytosis
Large particles are engulfed into the cell Pinocytosis – “cell drinking” Phagocytosis – “cell eating”

13 Active Transport – Exocytosis
Large particles exit the cell


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