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Cell Processes
There are approximately 200 different cell types in the human body. Most cells have the ability to metabolize, digest foods, dispose of wastes, reproduce, grow, move and respond to stimulus.
8
Biology
Undergraduate 2
08/16/2015

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Term
Describe Passive Transport
Definition

In this process, substances are transported across the membrane without any energy input from the cell. The two passive transport processed are called diffusion and filtration.

Term
Describe Diffusion
Definition

Diffusion is an important means of molecular transport for every cell in the body. This is where a substancemoves from an area of higher concentration to an area of lower concentration. Example: If you watch a drop of ink placed into a jar of water, you will see diffusion at work.

Term
Describe Filtration
Definition

Filtration generallly only occurs across capillary walls that serve as a filter. Example: When you strain the tea in a teabag, the tea bag allows some particle (the tea molecules) to move across the bag membrane, but keeps other particles (the tea leaves) in. This is filtration at work.

Term
What is Active Transport?
Definition

Whenever a cell uses some of its ADP supply (energy supply in the body) to move substances across the membrane, the process is referred to as active transport. Two important active transport processes:

  • Exocytosis
  • Endocytosis.
Term
What is Exocytosis?
Definition

Exocytosis is the means by which cells actively move substances out of the cell. This includes secreting hormones, mucus, and other cell products, or ejecting certain cellular wastes.

Term
What is Endocytosis?
Definition

Endocytosis is the active process of taking substances into the cell, in most cases necessary nutrients for the cell. lONe important activing in this category is the taking in of bacteria, dead cells, and other foreign material and is called phagocytosis.

Term
What are Phagocytes?
Definition

Phagocytes ("cell eaters") of the body act as scavenger cells, policing the body for foreign invaders.

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