Cell Structures and Processes
SL 1.2 Comparing Cells
Make a sketch comparing the design of the wigwam and the cell. Write a paragraph explaining the comparisons.
Videos and Podcasts
All living things are made of cells. Cells are the basic building blocks of life. Various scientists contributed to the development of cell theory. The human body is made of many different kinds of specialized cells that work together. There are some basic structural differences between plant and animal cells.
Introducing the Cell (21:00)
Learn that cells are the basic unit of life, be able to name and describe several single-celled organisms, be able to name basic cell parts, be able to describe the differences between animal and plant cells, and will learn that similar cells group together to form tissue.
Single-Celled Organisms (3:43)
Explore the world of microorganisms -- what they eat, how they move, what they have in common, and what distinguishes them from one another.
Tea Time (4:38)
Cell membranes are semi-permeable, allowing water and other materials in and out. Diffusion is the spontaneous flow down a concentration gradient. Once equilibrium is reached, the movement of materials in equals the movement of materials out, which is called osmosis.
Dynamic Equilibrium (6:07)
Dynamic equilibrium represents the constant change of a system to maintain equilibrium as materials flow into and out of the system. Diffusion and osmosis across a cell's semipermeable membrane helps to maintain equilibrium. Dialysis machines help people suffering from renal failure.