A4.1.1.PathBloodF



Conclusion 4.1.1.

1. Which chamber of the heart do you think is the most muscular? Explain your reasoning.

It's the left ventricle because it needs to pump the blood through the whole body.

2. A growing fetus has a vessel, the ductus arteriosus, in the heart that connects the pulmonary artery with the aorta and conducts blood directly from the right ventricle to the aorta. Why do you think this vessel closes soon after birth?

It closes because it can strain the heart and increase blood pressure in the lung arteries.

3. In most of the body, the arteries carry oxygenated blood and the veins carry deoxygenated blood. The exception to this pattern is the heart. Explain how and why specific arteries and veins of the heart are different from the pattern seen in the rest of the body.

Veins are thin-walled and don't need to cope with much pressure as the arteries that are thick and muscular-walled, which are flexible to cope with the differing force of blood flow by heart contraction. The rest of the veins and arteries in the body just carry the blood to the whole body and not making as much pressure as the veins and arteries of the heart.

4. Describe the mechanisms in place to prevent the blood from flowing in the wrong direction through the heart.

The AtrioVentricular Valves prevent the back flow of the blood to the atria when the ventricles contract.

And..

The Semilunar Valves prevent the back flow of the blood from the arteries to the ventricles

5. Explain what happens to tissues, such as the heart, or the brain, if oxygenated blood is not delivered in a timely manner.

The tissue of the organ starts to die.

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