We may not immediately think of our heart as a collection of individual cells. But it is the complex interaction of numerous cell types that give the heart its ability to pump blood. On this site, you will learn about the cells of the heart and you will get a see a video of the cells within the heart.

Students explore the applications of quantum dots by researching a journal article and answering framing questions used in a classwide discussion. This "Harkness-method" discussion helps students become critical readers of scientific literature.

Test your knowlegde about cell biology in this short quiz. If you miss a question, you will be given a page of information to review so you can try again. Good luck!

Try your hand at assembling this red blood cell jigsaw puzzle created with an image from CELLS alive! This puzzle is 32 pieces and generally takes a few minutes to solve.

Sel tumbuhan adalah bagian paling kecil dari organ tumbuhan yang berfungsi sebagai penggerak dari suatu tumbuhan itu sendiri. Selain itu, sel tumbuhan merupakan sekelompok sel eukariotik yang memiliki susunan yang sangat khas jika dibandingkan dengan jenis sel eukariotik lainnya. Bentuk sel tumbuhan selalu tetap karena adanya dinding sel dari selulosa. Sel tumbuhan umumnya prisma dan ada pula yang berbentuk balok memanjang.

Students learn that engineers develop different polymers to serve various functions and are introduced to selectively permeable membranes. In a warm-up activity, they construct models of selectively permeable membranes using common household materials, and are reminded about simple diffusion and passive transport. In the main activity, student pairs test and compare the selective permeability of everyday polymer materials engineered for food storage (including plastic grocery bags, zipper sandwich bags, and plastic wrap) with various in-solution molecules (iodine, corn starch, food coloring, marker dye), assess how the polymer’s permeability relates to its function/purpose, and compare that to the permeability of dialysis tubing (which simulates a cell membrane).

Background image of normal disc-shaped red blood cells from the University of Utah. Inset shows sickled red blood cells, curved and rigid, from the Virginia Medical College.

This course covers the derivation of symmetry theory; lattices, point groups, space groups, and their properties; use of symmetry in tensor representation of crystal properties, including anisotropy and representation surfaces; and applications to piezoelectricity and elasticity.

All cells, organs and tissues of a living organism are built of molecules. Some of them are small, made from only a few atoms. There is, however, a special class of molecules that make up and play critical roles in living cells. These molecules can consist of many thousands to millions of atoms. They are referred to as macromolecules (or large biomolecules).

Students learn how viruses invade host cells and hijack the hosts' cell-reproduction mechanisms in order to make new viruses, which can in turn attack additional host cells. Students also learn how the immune system responds to a viral invasion, eventually defeating the viruses -- if all goes well. Finally, they consider the special case of HIV, in which the virus' host cell is a key component of the immune system itself, severely crippling it and ultimately leading to AIDS. The associated activity, Tracking a Virus, sets the stage for this lesson with a dramatic simulation that allows students to see for themselves how quickly a virus can spread through a population, and then challenges students to determine who the initial bearers of the virus were.

The smallest unit of life is the cell. Cells are tiny factories that work with incredible precision. All living organisms consist of one or more cells. Regardless of their shape and form, which vary greatly, in each cell we can distinguish common organelles. The two most important cell categories are animal and plant cells. In this lesson, we will talk about the similarities and differences of the organelles found in animal and plant cells as well as their functions.