Lab 10: Physiology of the Circulatory System

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Lab 10: Physiology of the Circulatory System
2011-04-23 13:44:20
AP Bio Ten

AP Bio
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  1. What are the five phases of blood sounds?
    • silence
    • 1) snapping
    • 2) murmurs
    • 3) thumping
    • 4) muffling
    • 5) silence
  2. Those who are physically fit have a higher __ than more sedentary individuals.
    stroke voluem
  3. Why is blood pressrue and heart rate differ when measured in a reclinng position and in a standing position?
    • when you are reclining you are relaxed, so you're BP is low. When you stand, the body isn't at rest anymore and must work harder to pump the blood throughout the body.
    • Also, gravity has an effect on BP. When you are standing, gravity acts more on your body, causing your heart to have to work harder to pump the blood through the body, increasing heart rate and BP.
  4. Why is high BP a health concern?
    high blood pressure has a greater impact on the arteries, which are already under high pressure. Due to the increased high blood pressure, the walls of the arteries (the endothelium) are damaged and can cause plaque buildup forming a thrombus, which can cause a stroke or a heart attack. Also, the kidneys are already under high BP. Anymroe can damage the kidneys.
  5. Why must an athlete exercise harder and longer to achieve a max HR than a person who is not as physically fit?
    because they are fit, their body is used to constantly being pushed. Their heart is used to pumping blood at higher rates, and they are used to the increase in blood level. Eventually, it isn't using force to supply the demand for oxygen and blood. It is doing it because it is used to it. Also, they have a higher stroke volume, which'll enable them to be able to work out longer without feeling tired or worn out.
  6. Wy is smoking a cause of a rise in BP?
    smoking contains nicotene, which stimulates the adrenal glands to release epinephrine. Epinephrine causes the body to go into flight- or- fight mode, causing increased BP, increased HR, vasoconstriction. With a continuous increase in BP, it damages the endothelium which can lead to formation of a thrombus. Also less O2 and various nutrients are not reaching body parts as before.
  7. In the ectothermic portion of the lab, what is the inde and dependent variable?
    • inde: temp
    • depen: metabolic rate
  8. Why does temp affect HR in ectothermic organisms?
    temp affects HR becuase they are conformers. So, whatever temp the environment has is the temp the organisms body will have. At lower temps, they have a decrease in HR. At higher temps, they have an increase in HR.
  9. Discuss what results you might obtain if you repeated the experiment with an endothermic organisms.
    With an endothermic organism, there'd be no real change in the HR and MR. This is because they are regulators and have internal mechanisms that will help them maintain their body temp. They have to maintain a certain body temp because they are warm blooded.
  10. What are some ways ectotherms' behaviors help them regulate their temp?
    • orient to or away from the sun
    • shade/ going to the sun
    • huddling
    • evaporation
    • convection
    • conduction
    • radiation