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How do materials enter and leave the body?

The membrane controls what substances enter and exit the cell. Active Transport involves addition of ATP in order to bring materials into or out of a Cell. In general, passive mechanisms transport materials from areas of high concentration into areas of lower concentration (movement is with the concentration gradient).

How do substances enter and leave the blood?

Blood moves very slowly through capillaries. As the blood moves through a capillary, nutrients, oxygen, and food leave the blood and enter the body cells. Capillaries are exchange vessels. Gases (oxygen and carbon dioxide), nutrients, and wastes pass in both directions across capillary walls.

Why do substances move in and out of cells?

Substances move in and out of cells by diffusion down a concentration gradient, through a partially permeable membrane. The efficiency of movement of substances in and out of a cell is determined by its volume to surface area ratio. Osmosis is a type of diffusion but refers only to the movement of water molecules.

How do molecules move in our body?

Particles – molecules or ions – in a liquid and a gas are constantly moving randomly. If particles of a substance are in a higher concentration compared to another area, their random movement leads to a net movement of particles from this region to the region of lower concentration. This is called diffusion .

What is an example of spatial diffusion?

Spatial diffusion is the spread of the phenomenon, over space and timed, from limited origins. Diffusion processes are common in nature. On a regional scale, spatial diffusion includes the spread of diseases and epidemics, the territorial expansion of individual cities, and the expansion of ethnic neighborhoods.

What are examples of stimulus diffusion?

An example of stimulus diffusion is the growing worldwide love for hip hop music. Hip hop culture started in American inner cities like New York City,…

Is Mcdonalds an example of stimulus diffusion?

The idea (McDonald’s burgers) was acceptable, but not in its original form – hence stimulus diffusion.

Is religion a stimulus diffusion?

In stimulus diffusion, a trend catches on but is changed as it is adopted by different groups, such as when a certain religion is adopted by a population but the practices are blended with the customs of the existing culture. Stimulus diffusion can also apply to the more mundane as well.

What is religion diffusion?

Religion uses nearly all forms of diffusion to reproduce itself across space. Hierarchical diffusion generally involves the conversion of a king, emperor, or other leader who then influences others to convert. Contagious diffusion is most often seen in a religious context as the result of direct proselytizing.