Unit 7 cell transport pt.2
Summary of Cellular Transport Concepts
This content provides an overview of cellular transport mechanisms, focusing on the movement of
substances across cell membranes. It covers foundational concepts such as solutions, membranes,
types of transport, and the role of energy in cellular processes.
Core Concepts and Definitions
Term Definition
Solute The substance that is dissolved in a solution.
Solvent The substance that dissolves the solute; in biological systems, this
is primarily water.
Concentration Measured as mass of solute per volume of solvent (g/l).
Permeable Membrane A membrane with openings that allow particles to pass through
freely.
Semipermeable A membrane that only allows certain particles, typically based on
Membrane size or shape, to pass.
Cell Membrane (Plasma A phospholipid bilayer with hydrophobic (water-repellent) lipid tails
Membrane) and hydrophilic (water-attracting) phosphate heads, facilitating
selective permeability.
Cellular Membranes
● The cell membrane is composed of a phospholipid bilayer with two distinct regions:
● Hydrophobic lipid tails that repel water.
● Hydrophilic phosphate heads that attract water.
● This structure is essential for regulating water flow and substances entering or leaving the
cell.
Types of Cellular Transport
Cellular transport is classified into passive and active mechanisms based on energy usage and
direction of movement relative to concentration gradients.
Passive Transport
Summary of Cellular Transport Concepts
This content provides an overview of cellular transport mechanisms, focusing on the movement of
substances across cell membranes. It covers foundational concepts such as solutions, membranes,
types of transport, and the role of energy in cellular processes.
Core Concepts and Definitions
Term Definition
Solute The substance that is dissolved in a solution.
Solvent The substance that dissolves the solute; in biological systems, this
is primarily water.
Concentration Measured as mass of solute per volume of solvent (g/l).
Permeable Membrane A membrane with openings that allow particles to pass through
freely.
Semipermeable A membrane that only allows certain particles, typically based on
Membrane size or shape, to pass.
Cell Membrane (Plasma A phospholipid bilayer with hydrophobic (water-repellent) lipid tails
Membrane) and hydrophilic (water-attracting) phosphate heads, facilitating
selective permeability.
Cellular Membranes
● The cell membrane is composed of a phospholipid bilayer with two distinct regions:
● Hydrophobic lipid tails that repel water.
● Hydrophilic phosphate heads that attract water.
● This structure is essential for regulating water flow and substances entering or leaving the
cell.
Types of Cellular Transport
Cellular transport is classified into passive and active mechanisms based on energy usage and
direction of movement relative to concentration gradients.
Passive Transport
