Chelsey Hropovich & Domonique Swann Why are cells small? Chelsey Hropovich & Domonique Swann

Recognition to Robert Hooke and Anton Van Leeuwenhoek First to observe cork cellulae (small rooms) Leeuwenhoek First to observe living cells (Animalcules or little animals)

Cell Size is limited Relating to the diffusion of substances into and out of cells, the rate of diffusion is affected by the number of variables including: Surface area able for diffusion Temperature Concentration gradient of diffusion substance The distance over which diffusion must occur

If a cell grows beyond a certain size Materials will not be able to pass through the membrane fast enough When the cell reaches a size too large, it will divide into smaller cells in order to maintain a surface area/volume ratio. Therefore, cells remain small in order to survive.

What do cells look like?

Cell Quiz What are the four variables that affect the rate of diffusion? concentration, height, mass, and length surface area, density, concentration, and volume surface area, temperature, concentration, and density Green eggs and ham, with O.J.