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.
Optimal resting heart rate is defined as the number of times the heart beats in one minute, while in resting or sleeping condition. In other words, it is the minimum possible rate of heartbeat. It can be compared to the idling of a vehicle. The average heart rate in adults ranges from 65 to 80 beats per minute (bpm).