Plasma is a) a liquid ground substance containing dissolved proteins. b) a dissolved ground matrix and a lining of epithelial cells. c) a liquefied ground substance that includes several dissolved cells. d) platelets, red blood cells, and white blood cells. e) platelets and a watery ground substance.
A normal resting heart rate can range anywhere from 40 to 100 beats per minute. Below is a chart relating resting heart rate and fitness level. As can be seen on this chart, your resting heart rate can vary with your fitness level and with age â the fitter you are, generally the lower the resting heart rate.
What Is a Normal Resting Heart Rate? A normal resting heart rate is between 60 and 100 beats per minute. Having a heart rate in that sweet spot is important, because it decreases the demand of your heart muscle, meaning it doesnât have to work as hard, explains Kate Traynor, M.S., R.N., director of Cardiovascular Disease Prevention Center at Massachusetts General Hospital.