Students explore the effect of various activities on their heart rates.
Students can find out by counting their own pulse.
When an artery passes close to the skin, we can feel a pulse. With the middle fingers of one hand, students can find their pulse on the opposite wrist, just above the hand. Have them press down slighty with their fingers and count the beats felt for 15 seconds. Multiply the answer by four to find out how many times their heart beats per minute. Usually people feel a pulse, but students can make a simple device to watch it.