Materials are able to move across a cell membrane through one of two methods: active transport or passive transport. what is the difference between active transport and passive transport?

Passive transport: When materials move across cell membranes without using cell energy (ATP). Diffusion, facilitated diffusion, and osmosis are examples Moves small molecules like water, oxygen, carbon dioxide and glucose. ... Movement of materials across the cell membrane that requires the use of cell energy (ATP).

a motor homunculus represents a map of brain areas dedicated to motor processing for different anatomical divisions of the body.

homunculus represents the importance of various parts of your body as seen by your brain. as a result, they take up a lot of brain space. although the cortical homunculus is a curiosity, penfield's work in mapping the brain's relationship to the body was invaluable.

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very easy