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Cellular Processes

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by

Robert Williford

on 21 October 2015

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Transcript of Cellular Processes

Cellular Processes
Moving Small Particles
There are two ways particles can pass through the cell membrane.
1.
Passive transport
- the diffusion of particles through the proteins. This happens naturally and requires no energy.
2.
Active transport
- the movement of particles through proteins against the normal direction of diffusion.
What is Diffusion?
Particles naturally travel from areas where they are crowded to areas where they are less crowded.
Diffusion
- the movement of particles from an area of high concentration to an area of low concentration.
Diffusion of Water
Osmosis
- the diffusion of water through the cell membrane. It is such an important type of diffusion it was given it's own name.
The Cell and Osmosis
A cell must be able to obtain energy, exchange with the environment, and reproduce to maintain homeostasis.
Moving Large Particles
Endocytosis
- the cell membrane surrounds a particle and encloses it in a vesicle.
Exocytosis
- the vesicles are formed at the endoplasmic reticulum or Golgi complex and carries the particle to the cell membrane to be released.
What is Homeostasis
Homeostasis
- is the maintenance of a constant internal state in a changing environment.

Tasks to stay alive:
1. obtain and use energy
2. make new cells
3. exchange materials
4. eliminate wastes
The Cell Cycle
Cells grow, divide, and die. Some cells, such as skin cells, do this more often. This process is called the cell cycle.

mitosis
- the process of packaging the DNA into chromosomes so they can be split and separated to form two equal nuclei.
Full transcript