Days Lesson: Mr. Townsley’s 7th grade Science class is in the middle of a unit on the functions of the heart and circulatory system. Today’s lesson focused on the chambers of the heart and how it affects the system.
He gave the students an exit slip with the following question:
Explain how the contractions of the heart create blood pressure.
The following are examples of student responses.
Well, the heart pumps blood through the artories and veins. So the faster the heart pumps, the more blood pressure you would have.
You C, when blood leaves the heart it moves through the atories and viens. Becuz, there’s small atories in parts of the body than others blood pressure comes from that.
Blood pressure (BP) is the pressure exerted by circulating blood upon the walls of blood vessels, and is one of the principal vital signs. During each heartbeat, BP varies between a maximum (systolic) and a minimum (diastolic) pressure. The mean BP, due to pumping by the heart and resistance to flow in blood vessels, decreases as the circulating blood moves away from the heartthrough arteries. Blood pressure drops most rapidly along the small arteries and arterioles, and continues to decrease as the blood moves through the capillaries and back to the heart throughveins. Gravity, valves in veins, and pumping from contraction of skeletal muscles, are some other influences on BP at various places in the body.
Blood pressure comes from the pressure the blood flowing through the veins of the circulatory system. It is measured and lots of old people have high blood pressure. My grandpa always has to take medicine to help with his blood pressure.