-Cells are made up primarily of four elements: Carbon, oxygen, hydrogen, and nitrogen
-Living matter is over 60% water. Major building material of the cell is protein
-All cells maintain their boundaries, metabolize, digest nutrients, and dispose of wastes, grow, and reproduce, move, and respond to a stimulus.
-All cells have three major parts: Nucleus, cytoplasm, and plasma membrane
The nucleus is usually located near the center of the cell. It is surrounded by semi-fluid cytoplasm, which in turn is enclosed by the plasma membrane, which forms the outer cell boundary.
-Cells vary in length- ranging from 2 micrometers in the smallest cells to over a meter or more in nerve cells.
-Living matter is over 60% water. Major building material of the cell is protein
-All cells maintain their boundaries, metabolize, digest nutrients, and dispose of wastes, grow, and reproduce, move, and respond to a stimulus.
-All cells have three major parts: Nucleus, cytoplasm, and plasma membrane
The nucleus is usually located near the center of the cell. It is surrounded by semi-fluid cytoplasm, which in turn is enclosed by the plasma membrane, which forms the outer cell boundary.
-Cells vary in length- ranging from 2 micrometers in the smallest cells to over a meter or more in nerve cells.
Different Cell Shapes:
Cells have different shapes. Some are disk shaped (red blood cells)
Threadlike extensions (nerve cells)
Toothpicks pointed at each end (smooth muscle cells)
Cubelike (epithelial cells)