Muscle stiffness is a condition in which muscles feel tight and contracted rather than the usual supple state of muscles at rest.Itâs also called stiff muscles, rigidity, and in severe cases, spasticity. Muscle stiffness is a feeling of tension and contraction in the muscles.uscle stiffness is a condition in which muscles feel tight and contracted rather than the usual supple state of muscles at rest.
Making the world better, one answer at a time. Using the definition of organ as a group of cells that perform a specific function, the average human body has 78 organs. There are approximately 78 organs in the body. Using the definition of organ as a group of cells that perform a specific function, the average human body has 78 organs.
Updated February 28, 2016. An organ system is a group of organs that work together to perform a complex function. There are eight organ systems in the human body. All of these are required for survival, either of the person or of the species. The circulatory system includes the heart and blood vessels (arteries and veins), as well as the blood itself.