Cell Functions and Processes

A series of free High School Biology Video Lessons.

Here we look at anaerobic and aerobic respiration, cell division and photosynthesis.

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Anaerobic Respiration
Anaerobic respiration is the process of producing cellular energy without oxygen. Anaerobic respiration is a relatively fast reaction and produces 2 ATP, which is far fewer than aerobic respiration. Anaerobic respiration happens in the cytoplasm where glycolysis releases energy from glucose and fermentation recycles NADH back to NAD+.
The process of anaerobic respiration.

Aerobic Respiration
Aerobic respiration is the process of producing cellular energy involving oxygen. Cells break down food in the mitochondria in a long, multistep process that produces roughly 36 ATP. The first step in <="" strong="">is glycolysis, the second is the citric acid cycle and the third is the electron transport system.

Cell Diffusion
Cell diffusion is a type of passive cell transport. In diffusion, molecules move from areas of high concentration to areas of low concentration in order to decrease the concentration gradient. Diffusion from areas of low concentration to areas of high concentration is not energetically favourable.
The process of cell diffusion.

Photosynthesis is a process found in plant cells which converts light energy into chemical energy in the form of sugars that the plant can store and use at any time. Photosynthesis takes place in the chloroplasts, an organelle only found in plant cells, and consists of two parts: the light dependent reaction, which converts light energy into ATP, and the Calvin cycle, which converts ATP into glucose.
An overview of photosynthesis.

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