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Blood Pressure Lab - PowerPoint

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1)   What is the difference between the sizes of an artery, capillary,
     and vein?

2)   What do you think the relationship between temperature and heart
     beat is?

3) Blood pressure is…the force exerted against blood vessel walls.
      Responsible for the flow of blood
The result of:
______________,______________, and ______________
– Pumping action of the heart
– Resistance of the blood vessels
– Volume of blood
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Draw and explain
             Explain
• How does the structure of an
  artery relate to its function?
The structure of ______
The function is________
The structure relates to function
  because_________
 RBC from heart  artery  arteriole  capillary


RBC
 O2


                                                      Gas
                                                   Exchange




      RBC back to heart  vein  venule  capillary
 Follow a blood cell from the heart…

• Start at the Aorta – largest artery in body
  – Contains OXYGEN


• Cell leaves aorta = ARTERY


• Continues to travel to a small artery =
  ARTERIOLE
RBC from heart  artery  arteriole  capillary
              Artery
                                          Arteriole
  RBC
   O2
            CAPILLARIES
           “Gas Exchange”
          O2       CO2 out
• An arteriole becomes and even smaller
  CAPILLARY

• This is where OXYGEN leaves the red
  blood cell

• This is where CARBON DIOXIDE enters
  the red blood cell
   Oxygen leaves RBC and enters tissue;
Carbon dioxide leaves tissue and enters RBC




                                          RBC
                           TISSUE
                                            O2
                                       bicarbonate
                            CO2
    Follow a blood cell back to the
                heart…
• Red blood cell with CARBON DIOXIDE

• Cell travels in blood through a capillary and enters
  a VENULE (small vein)


• Continues to travel to a VEIN


• Returns to HEART
                                              RBC
                                              bica
                                              rbo
                                              nate


                                     Venule
     VEIN

RBC back to heart  vein  venule  capillary
• Blood moving through the
  blood vessels exerts
  pressure against the
  vessel walls. This blood
  pressure is highest in the
  aorta. It decreases as the
  blood moves through the
  arterioles, capillaries,
  venules, and veins.
  Understanding Blood Pressure

• When we measure blood pressure, we are actually
  measuring the systolic pressure and the diastolic
  pressure separately.

• This is why you always see blood pressure reported as
  two numbers, one "over" the other. For example:

• In a blood pressure reading of 110/80,110 = systolic
  pressure80 = diastolic pressure.

• The numbers refer to the number of millimeters the
  pressure will raise a column of mercury.

• The blood pressure of teenagers is frequently in the
  range of 120/70.
               Hypothesis
• Will blood pressure be higher or lower if
  lying vs standing?

• Will cold temp increase or decrease
  Daphnia heart beat?
                            Daphnia

• Humans are homeothermic (warm blooded) in that the body
  generates heat internally to maintain a certain temperature level.
  Lower animals do not generate heat internally and thus relay on
  external sources for their warmth.

• This is known as poikilothermic (cold blooded). Daphnia is such an
  animal. This small, about 1 mm, aquatic crustacean draws its heat
  from the surrounding water in which it lives. As the temperature of
  the water increases, so does its body temperature. An increase in
  temperatures means an increase in activity, both physically and
  metabolically. This increase can be seen as an increase in heart
  rate. The object of this lab is to record the temperature vs heart rate
  for Daphnia.
       Data for Daphnia
Copy and graph. Interpret graph
Temperature   Heart Rate
(celsius)     (beats/min)

     5            108
    10            152
    15            211
    20            290
        Discussion Questions
1) Why does temperature affect heart rate in
   ectothermic organisms?
2) Discuss what results you might obtain if you
   repeated this experiment using an endothermic
   organism
3) Why does smoking cause a rise in blood
   pressure?
4) Explain why blood pressure and heart rate
   differ when measured in reclining position and
   in a standing position.
• Blood pressure is a measure of how hard
  your blood is pushing against the walls of
  your veins while it is pumped. Blood
  pressure is lower when standing due to
  gravity.
• http://www.medicalvideos.us/play.php?vid
  =615

• http://www.bing.com/videos/search?q=Blo
  od+Pressure+arterial+flow+video&view=d
  etail&mid=B7DE91E4E45BF379F077B7D
  E91E4E45BF379F077&first=0
Why do some people feel faint when
 they go quickly from lying down to
 standing?

The force of gravity causes the blood
 pressure in vessels going to the brain to
 drop. This causes temporary faintness
 until homeostatic mechanisms elevate
 blood pressure in these vessels.
How and why does heart rate
 change with body position?


The heart rate generally increases from lying
 to sitting to standing as more energy is
 required to maintain each of these
 postures.
              Virtual Lab
• http://www.mhhe.com/biosci/genbio/virtual
  _labs/BL_08/BL_08.html
              Lab Quiz 1
• http://www.phschool.com/science/biology_
  place/labbench/lab10/quiz1.html

				
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