The smallest unit of organization is the cell. The next largest unit is tissue; then organs, then the organ system. ... A tissue is a group of similar cells that perform the same function. The human body contains four basic types of tissue: muscle tissue, nervous tissue, connective tissue, and epithelial tissue.
The name isovolumetric indicates that there is no change in volume that takes place and this only occurs when all of the valves within the heart are shut.
