From Wikipedia, the free encyclopedia. Interstitial fluid or tissue fluid is a solution that bathes and surrounds the tissue cells of multicellular animals. It is the main component of the extracellular fluid, which also includes plasma and transcellular fluid.The interstitial fluid is found in the interstices-the spaces between cells (also known as the tissue spaces).t is the main component of the extracellular fluid, which also includes plasma and transcellular fluid. The interstitial fluid is found in the interstices-the spaces between cells (also known as the tissue spaces).
Cardiac Preload. Preload can be defined as the initial stretching of the cardiac myocytes prior to contraction. Preload, therefore, is related to muscule sarcomere length.ardiac Preload. Preload can be defined as the initial stretching of the cardiac myocytes prior to contraction. Preload, therefore, is related to muscule sarcomere length.
Specifically, the resistance comes from the blood vessels and the contraction of the blood vessel walls. Remember that cardiac output is the amount of blood ejected by the heart in one minute. Afterload is one of four processes that make up cardiac output.The other three processes are preload (the pressure of the blood on the heart muscle fibers), contractility (the force of the contraction), and heart rate.To have more cardiac output you have to have lower afterload. Stroke volume is the actual contraction of the muscle fibers that eject the blood from the heart.fterload rises with age and hypertension (increased blood pressure). With age the arteries stiffen due to degeneration; therefore, less contraction of the ventricle occurs and less blood is ejected from the ventricle. Hypertension has a slightly different effect-especially on the left ventricle.