Question

a Tables Table 2: Experimental Observations Observations (with valve) and mL HO Displaced? Observations (without valve) and mL HO Displaced? Post-Lab Questions happened when you pressed on the palloon stretched over the jar? result represent? 2. What structure in this experiment mimics a heart valve? How did the valve influence the experimental results? If possible, indicate the difference in water displaced (in mL) with the valve versus without the valve. Does the valve enhance water flow? Why? 3. 4. What other organs or body systems incorporate valves? How are they u lon) pressure dood all OeScience La

Answer 1

1. When the balloon stretched over the jar is pressed the water moves from the jar through the straw into the pan. The cut end of the balloon prevents the water from flowing back into the jar. The cut end of the balloon acts as the heart valve which prevents the backflow of blood into the heart.

2. The cut end of the balloon acts as the heart valve in the experiment.

3. When the experiment is done without the valve, water will come out of the straw , but some amount of the water will go back down the straw. Similarly the heart also need valves to separate it chambers and at the beginning of the arteries to move blood through the heart and into the body. Valves also helps in preventing the back flow of the blood.

4. Heart

Valves between the chamber : two atrio-ventricular (AV) valves

Two semilunar valves: the aortic valve and the pulmonary valve

Valves in the veins prevents the back flow of blood