Cell Biology Basics

Cell Inputs and Outputs

HSC Biology | Free Study Notes This topic matters because cells must constantly take in useful substances, remove wastes, and maintain water balance in order to stay alive. In this lesson the main substances cells take in the main substances cells remove why gases, nutrients and ions matter how wastes are produced and removed why water balance is important Why cells need inputs and outputs Cells are not closed systems. They must exchange substances with their surroundings to

Rachel Taylor

Mar 314 min read

Surface Area to Volume Ratio

HSC Biology | Free Study Notes This topic matters because cells need to exchange materials such as gases, nutrients and wastes across their membranes, and the syllabus directly links this exchange to surface area to volume ratio, concentration gradients and the characteristics of the materials being exchanged. In this lesson what surface area to volume ratio means why cells are usually small how SA:V affects exchange efficiency why diffusion becomes less effective in larger c

Rachel Taylor

Mar 314 min read

Diffusion, Osmosis and Active Transport

HSC Biology | Free Study Notes

Rachel Taylor

Mar 314 min read

The Cell Membrane and Fluid Mosaic Model

HSC Biology | Free Study Notes This topic matters because the cell membrane controls what enters and leaves the cell, helping to maintain the cell’s internal environment. In this lesson what the cell membrane does the structure of the phospholipid bilayer the role of membrane proteins what selective permeability means why the membrane is described as a fluid mosaic What is the cell membrane? The cell membrane is a thin boundary around the cell. Its main job is to separate the

Rachel Taylor

Mar 313 min read