Presentation is loading. Please wait.

Presentation is loading. Please wait.

Unit 4: Cells 4.5 Active Transport

Published byHamdani Lesmana Modified over 6 years ago

Similar presentations

Presentation on theme: "Unit 4: Cells 4.5 Active Transport"— Presentation transcript:

1 Unit 4: Cells 4.5 Active Transport

2 Active Transport Overview
Moves substances up (against) the concentration gradient. From areas of low concentration to high concentration. This movement requires energy from the cell! The energy is supplied by ATP Most substances require a carrier or transport protein to move across the membrane.

3 Solute Pumping: Sodium-Potassium Pump
Moves 3 Sodium Ions (Na+) out and 2 Potassium Ions (K-) in. Na+ has a higher concentration outside the cell K- has a higher concentration inside the cell

4 Steps: Inside: 3 sodium (Na) ions and an ATP bind to the pump
A phosphate group is removed from the ATP, releasing energy. The pump changes shape. It releases the sodium outside the cell

5 Steps (cont.) Outside: 2 potassium ions (K) bind to the pump.
The phosphate group is released. The pump changes shape again. It releases the potassium inside the cell.

6

7

8 Why is it important? It keeps Sodium from accumulating in the cell.
Sodium is constantly diffusing into the cell through ion channels. If it builds up, it causes water to move into the cell. This could cause the cell to swell or burst! Maintains the concentration gradients This helps us move other substances, like glucose, across the membrane.

9 Movement in Vesicles Endocytosis and Exocytosis

10 Endocytosis Proteins and polysaccharides are too big to move across the membrane so they must enter through vesicles. Steps: The membrane forms a pouch around the substance. The pouch closes up and is then pinched off to form a vesicle. The vesicle then fuses with Lysosomes or other organelles.

11

12 Types of Endocytosis Pinocytosis: Tiny pockets form along the cell membrane, fill with liquid, and pinch off to form vacuoles within the cell This allows cells to take up liquid from the surrounding environment Phagocytosis: Extensions of cytoplasm surround a particle and package it within a food vacuole. The cell then engulfs it Amoebas use this method to take in food White blood cells use this method to “eat” damaged cells.

13 Exocytosis Some substances are too large to move out of the cell across the membrane, so the exit the cell through exocytosis. The cell uses exocytosis to export proteins out of the cell. Steps: The vesicle inside the cell fuses with the cell membrane. The vesicle opens and releases its contents outside the cell.

14

15

Download ppt "Unit 4: Cells 4.5 Active Transport"

Similar presentations

Cells and Their Environment

Cells and Their Environment
Active Transport  Active transport moves molecules across the cell membrane from an area of _______concentration to an area of ____________ concentration.

Active Transport  Active transport moves molecules across the cell membrane from an area of _______concentration to an area of ____________ concentration.
ACTIVE TRANSPORT. Moving substances against their concentration gradient Cost energy!!! Types of Active Transport  Sodium-potassium pumps  Endocytosis.

ACTIVE TRANSPORT. Moving substances against their concentration gradient Cost energy!!! Types of Active Transport  Sodium-potassium pumps  Endocytosis.
Ch. 4: “Cells & Their Environment”

Ch. 4: “Cells & Their Environment”
Lesson Overview 7.3 Cell Transport.

Lesson Overview 7.3 Cell Transport.
1 ACTIVE TRANSPORT ACROSS A MEMBRANE. Overview of Active Transport Active Transport 1. Carrier Protein 2. Endocytosis3. Exocytosis.

1 ACTIVE TRANSPORT ACROSS A MEMBRANE. Overview of Active Transport Active Transport 1. Carrier Protein 2. Endocytosis3. Exocytosis.
Active Transport Overview Sometimes cells need to move substances from low concentration to high concentration These substances move up the concentration.

Active Transport Overview Sometimes cells need to move substances from low concentration to high concentration These substances move up the concentration.
ACTIVE TRANSPORT Energy Used to Move Cellular Materials.

ACTIVE TRANSPORT Energy Used to Move Cellular Materials.
ACTIVE TRANSPORT. LEARNING GOALS We need to understand the basic process of transport across a plasma membrane. We are learning... To understand the difference.

ACTIVE TRANSPORT. LEARNING GOALS We need to understand the basic process of transport across a plasma membrane. We are learning... To understand the difference.
CHAPTER 5 Cell Homeostasis. Section 1: Passive Transport  Cell membranes: controls what enters and leaves the cell  Sometimes it takes energy to do.

CHAPTER 5 Cell Homeostasis. Section 1: Passive Transport  Cell membranes: controls what enters and leaves the cell  Sometimes it takes energy to do.
A. Active Transport a. Active transport is the transport of a substance across the cell membrane against its concentration gradient (from low to high.

A. Active Transport a. Active transport is the transport of a substance across the cell membrane against its concentration gradient (from low to high.
Discussion Questions – in your notes 1. Movement across a cell membrane without the input of energy is described by what term? 2. A substance moves from.

Discussion Questions – in your notes 1. Movement across a cell membrane without the input of energy is described by what term? 2. A substance moves from.
Active Transport. Moves molecules from low to high concentration AGAINST a concentration gradient Requires energy, so cell must use ATP.

Active Transport. Moves molecules from low to high concentration AGAINST a concentration gradient Requires energy, so cell must use ATP.
ACTIVE TRANSPORT In many cases, cells must move materials from an area of lower concentration to an area of higher concentration. Higher conc Lower conc.

ACTIVE TRANSPORT In many cases, cells must move materials from an area of lower concentration to an area of higher concentration. Higher conc Lower conc.
Active Transport Section 4.2. Movement Against a Concentration Gradient  The transport of a substance across the cell membrane against its concentration.

Active Transport Section 4.2. Movement Against a Concentration Gradient  The transport of a substance across the cell membrane against its concentration.
Key Ideas What determines the direction in which passive transport occurs? Why is osmosis important? How do substances move against their concentration.

Key Ideas What determines the direction in which passive transport occurs? Why is osmosis important? How do substances move against their concentration.
Active Transport Sometimes cells must move against the concentration gradient- low concentration to areas of high –From areas of low concentration to.

Active Transport Sometimes cells must move against the concentration gradient- low concentration to areas of high –From areas of low concentration to.
 Cell transport is the movement of particles and it takes place because cells are trying to maintain balance (homeostasis).

 Cell transport is the movement of particles and it takes place because cells are trying to maintain balance (homeostasis).
Active Transport Movement of materials through a membrane against a concentration gradient and requires energy from the cell. (ATP) Low Concentration.

Active Transport Movement of materials through a membrane against a concentration gradient and requires energy from the cell. (ATP) Low Concentration.
Active Transport *Solutes flow against the concentration gradient. * The cell uses energy…. ATP. *Requires Transport Proteins Types of Active Transport.

Active Transport *Solutes flow against the concentration gradient. * The cell uses energy…. ATP. *Requires Transport Proteins Types of Active Transport.

Similar presentations

Ads by Google