Playland Assignment :)

1. My heart rate increased significantly while waiting in line, it was more rapid. Although I don't have any evidence of recording my heart rate, I did take it down. It was around 117 just because of the excitement of the ride, and after the ride my hear rate was a little bit higher around 120.

2. I think my heart rate is affected by the stress of a situation like saying "We're having a pop quiz" would illicit a faster heart rate. This is because the heart is responding withe nerves and chemicals to external forces.

3. Breathing is effected similarly like the heart. It is similar because it's the reaction of the body to the stress of a situation or a chemical change due to fear.

4. My hands grew clammy and cold. Clammy hands occur due to hyperactive nerves, that send signals to the sweat glands in the skin in the sympathetic nervous system. It is also caused by a rise in temperature in the body. 

Playland evidence!

Heart dissection questions!

1.      Compare the structure of the atria and ventricles - how are they different?  Why is that?

The structure for the atria has thinner walls than the ventricle, which tends to be thicker. The atria have lower blood pressure while the ventricles have a higher blood pressure. In addition the atria are the upper chamber of the heart while the ventricles are the lower chamber of the heart.

2.       Did you notice a difference between the veins and arteries entering and leaving the heart?  How is their structure different?

Arteries tend to carry oxygenated blood from the heart, and veins transport deoxygenated blood back to the heart. Like before the arteries tend to have more muscular and thicker walls, which in turn are more elastic than veins. Veins have a thin wall and maintain less elasticity, the blood flow is slower, unlike in the arteries where blood tends travel rapidly.

3.      Describe the valves that you found in the heart - what are their functions?

There are 4 different valves found in the heart, the pulmonic valve, the tricuspid, the mitral and the aortic valve. They all aid in the proper blood flow through the heart, keep blood moving efficiently and smoothly, and most importantly in the right direction. There pulmonic is also nicknamed the left semilunar valve, because of its outward structure.

4. What surprised you about dissecting the heart?  Why?

It surprised us by how muscular and heavy it was, we didn’t expect it to way so much, but it makes sense that it does.

by corey, addy, jamie and tasha