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Cell Functions and Processes

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A series of free High School Biology Video Lessons.
The definition and importance of osmosis, Understanding different types of cellular energy production, cell transport, Homeostasis.

Osmosis is the diffusion of water molecules across a semi-permeable membrane from an area of high concentration to an area of low concentration. In cells, osmosis occurs across the cellular membrane to keep a cell from becoming flaccid (not enough water) or turgid (too much water).
The definition and importance of osmosis.
Cellular Energy Production
There are several types of cellular energy production. Plants produce energy from light through a process known as photosynthesis. Eukaryotic cells use their mitochondria to generate ATP through a process called cell respiration. Respiration that uses oxygen is called aerobic respiration while oxygen-less respiration is called anaerobic respiration.
Understanding different types of cellular energy production.

Cell Transport
Cell transport is movement of materials across cell membranes. Cell transport includes passive and active transport. Passive transport does not require energy whereas active transport requires energy to proceed. Passive transport proceeds through diffusion, facilitated diffusion and osmosis.
An overview of cell transport and its different types.
In order for biological processes to proceed, organisms need to maintain standard internal balances. They do so through systems of negative feedback called homeostasis which ensure that all things happen in moderation. The processes and controls involved in homeostasis vary from organism to organism, but often involve hormonal signals.
The definition and importance of homeostasis.

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