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.
Your urinary tract is the system in your body responsible for filtering wastes in your blood, and excreting wastes out of the body. Your urinary tract consists of your kidneys, ureters and bladder. Once the kidneys and their nephrons filter excess wastes that have circulated through your body, they are then able to turn the excess waste products into urine. The urine flows out of your urethra, and out of your body.