Pulse 10
Pulse 10
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10 POINTS! PULSE RATE QUESTIONS ! i.e why would you take your resting pulse rate before performing it?
1. why did you take your resting pulse rate before performing the lab
2. If you were experimenting testing your pulse rate, what experimental errors could have affected your conclusion?
3. Besides the wrist what other sites on the body where on can take a pulse ? why these sites?
4. when one takes a pulse, is one feeling an artery or vien? explain
5. why do you think holding your breath or breathing into a bag affects the pulse rate?
1. Presumably, you wanted to see how the experimental variable (exercise?) changed the pulse rate. If you didn't know what it was to start with, you couldn't tell how it changed.
2. You could have mismeasured it - e.g., by taking it with your thumb (which has its own pulse), or by miscounting, or getting the time interval wrong. If you are comparing between people, perhaps the amount of exercise differed, etc.
3. Another place to take the pulse is on the side of the neck - at the carotid artery. Alternative sites are places where the major blood vessels are fairly close to the skin.
4. To measure pulse, you measure an artery, because it is only there you can feel the rhythmic differences in presure. It is due to the difference between systole (when the heart pumps) and diastole (when it relaxes). This is measurable in the arteries because they have elastic walls, that expand and rebound with each beat. However, once the blood goes through the tissues and is returning to the heart via the veins, it has lost its pulsatile nature.
5. Holding your breath tends to reduce return flow of blood to the heart (that's why your face gets red - excess blood). Your body tries to keep the amount of blood sent out the same. Because there's less blood, the heart beats less strongly. There's a special sensor to measure this, and it responds by increasing the heart rate (by decreasing the amount of acetyl choline released by parasympathetic nerves onto the SA node of the heart).
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