The sheets of cells that cover and line the body, the junctions that hold them together and the glands that they form.
3 lessons, about 1 h 20 min3 simulations10 problems3 practice questionsPython in every lesson
Cut your finger and you find a covering layer, a bleeding layer below it and a tender nerve under that. This lesson names the four basic tissues of an animal, then studies the first of them: epithelial tissue, the sheets that cover and line the body, the shapes of its cells and the places where each kind is found.
Cells of a tissue must hold together, seal gaps and talk to one another, and some of them must make products to send out. This lesson describes the three kinds of cell junction and the glands, from the goblet cell to the salivary gland, with the difference between a gland with a duct and one without.
Bone, blood, fat and the tendon at the back of your ankle seem to have little in common. Yet they are all connective tissue, and all have cells in a matrix. This lesson sorts connective tissue into loose, dense and specialised kinds, and takes a close look at cartilage, bone and blood.
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