Notes

Jobs of the cell membrane
•Isolate the cytoplasm from the external environment
•Regulate the exchange of substances
•Communicate with other cells
•Identification
Cholesterol - stiffens the membrane by connecting phospholipids Glycolipids - signal molecules
Glycoproteins - have an attached chain of sugar (antibodies)
Channel Proteins - form small openings for molecules to defuse through
Carrier Proteins- binding site on protein surface "grabs" certain molecules and pulls them into the cell, (gated channels)
Receptor Proteins - molecular triggers that set off cell responses (such as release of hormones or opening of channel proteins)
Cell Recognition Proteins - ID tags, to idenitfy cells to the body's immune system
Enzymatic Proteins - carry out metabolic reactions
Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Cells also contain the body’s hereditary material and can make copies of themselves.

Cells- have many parts, each with a different function. Some of these parts, called organelles, are specialized structures that perform certain tasks within the cell

Cytoskeleton- The cytoskeleton is a network of long fibers that make up the cell’s structural framework. The cytoskeleton has several critical functions, including determining cell shape, participating in cell division, and allowing cells to move. It also provides a track-like system that directs the movement of organelles and other substances within cells.
Mitochondria- Mitochondria are complex organelles that convert energy from food into a form that the cell can use. They have their own genetic material, separate from the DNA in the nucleus, and can make copies of themselves