Download presentation
Presentation is loading. Please wait.
Published byRegina Booker Modified over 6 years ago
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
Similar presentations
© 2024 SlidePlayer.com. Inc.
All rights reserved.