Bios140 week 5 ilab – cardiolab devry university

Bios140 week 5 ilab – cardiolab devry university

BIOS140 Week 5 iLab – CardioLab Devry University 

Preview of solution:

Step 1:   Determine Baseline Values

Record baseline values in table below.  (4 pts)

Value	Measurement
80.51	Mean Arterial Pressure (mm Hg)
69.41	Heart Rate (beats/min)
78.05	Stroke Volume (ml)
1188.9	Total Peripheral Resistance (dyne-s/cm5)
6.20	Blood Volume (L)

Step 2:  Effect of Viscosity on Mean Arterial Pressure

1. Develop a hypothesis to predict the effect of an increase in blood viscosity on mean arterial pressure. (3 pts)

An increase in blood viscosity will produce an increase on the mean arterial pressure because it will raise the total peripheral resistance.

2. Record data (5 pts)

Measurement	“Lowest” Setting: Viscosity	“Highest: Setting: Viscosity
Mean Arterial Pressure (mm Hg)	71.88	78.32
Heart Rate (beats/min)	107.96	62.28
Stroke Volume (ml)	98.82	71.86
Total Peripheral Resistance (dyne-s/cm5)	538.56	1403.73
Blood Volume (L)	6.20	6.20

c. Describe your results.  What was the impact of lowering blood viscosity?  What was the impact of increasing blood viscosity? (2 pts)
Mean arterial pressure increased from 71.88 to 78.32 mm Hg.  The mean arterial pressure rose because of the increase in the blood viscosity which will cause an increase in total peripheral resistance. 

4. Why would changing blood viscosity change mean arterial pressure? (2 pts)

Changing the blood viscosity would change mean arterial pressure because of the increase in blood flow.

Step 3: Effect of Vessel Radius on Mean Arterial Pressure

1. Develop a hypothesis to predict the effect of an increase in vessel radius on mean arterial pressure. (3 pts)

An increase in the vessel radius will lower mean arterial pressure by decreasing total peripheral resistance.  However, a decrease in the vessel radius will increase mean arterial pressure by increasing total peripheral resistance.


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