The blood which has obtained oxygen then travels back to the heart where it is pumped to all parts of the body. Explain that as the blood is pumped through the arteries, you can feel the artery walls stretch and relax. Ask students what this is called. Entertain their ideas and clarify that this is their pulse. Ask how they could measure the pumping of their hearts using the pulse.
Students work in groups to brainstorm the possibilities.
Allow groups to share and clarify. Have students feel for pulse with their fingers. Guide into discussion of problems that may arise by using the finger to feel pulse. Ask students to share personal experiences of having their pulse taken with their groups. Provide each student with a toothpick and a piece of clay.