A normal PR interval measures 0.12-0.20 seconds which is 3 to 5 small boxes on the EKG strip. When you measure a PR interval, you start measuring at the BEGINNING of the p-wave until the BEGINNING of the QRS complex. Here are some simple steps on how to measure the PR interval: Find the P-wave on the EKG strip. Determine where the PR interval is, and to do this you start measuring at the beginning of the p-wave until the beginning of the QRS complex. Count the SMALL boxes between there measurements. Remember each box represents 0.04 seconds.
The role of the excretory system is to rid the body of toxic waste products. Which of these body systems also plays a direct role in removing waste products from the body? A) endocrine B) nervous C) respiratory D) skeletal.
Many illnesses and disorders affect how your body removes waste and toxins. The system that takes care of that is broadly called the excretory system, and includes your lungs, kidneys, urinary tract, skin, and bladder. Problems with any of these parts of your body can affect the appearance, concentration, and content of your urine (Mayo). Urinalysis is not the same as drug screening or pregnancy tests, although all three tests involve a urine sample.