Physio Ex Lab Exercise 5 Cardiovascular Dynamics 1-4

1. Which is more likely to occur, a change in blood vessel radius or a change in blood vessel length?

The cardiovascular system is a network of the heart, blood vessels and the blood. It circulates blood throughout the blood vessels in our body in order to provide individual cells with oxygen and nutrients, and help to dispose of metabolic waste. Capillaries, which are the smallest blood vessels, have extremely thin walls. This is so diffusion can happen more efficiently. Every cell has capillaries passing through very close so there is a shorter distance for diffusion to occur. During my experiment, it showed that the larger the agar cube, the more of remaining agar which was left to be diffused. It also showed that the smaller the agar cube, the less remaining agar was left to be diffused. The findings from my experiment prove that the smaller

37. At any given time, most blood is in what vessels? (arteries or veins?) arteries

Deacreased vascular resistance and increased arterial pressure causes an increase in blood flow. This is important to supply organs with oxygen. 4. Restate your predictions that were correct and give data from your experiment that support them. Restate your predictions that were not correct and correct them with supporting data from your experiment. MAP would increase due to increase in activity, SVR would decrease due to decrease in resistance, CO would increase due to more force of blood being expelled.

13. Identify the cellular components of blood, their functions and where they are produced in the body.

B. Part B. PowerPhys Experiment 4 – Effect of Exercise on Cardiac Output (13 points total)

2. Which of the following terms refers to either a reduction in the quantity of hemoglobin or a reduction in the volume of red blood cells?

7. Why is most of the blood volume in the veins, and how is blood returned to the heart in this low pressure system?

Person 1 has longer ventricular filling time because they have a lower heart rate which causes the ventricles to take longer to fill up with blood. Venous return is the amount of blood returning to the heart. Since person 2 has a greater stroke volume, Person 2 has the greater venous

14. What do your heart block experiment results indicate about the spread of impulses from the atria to the ventricles?

(c) Estimate the EC50 values for the effects of acetylcholine and nitroprusside in both types of arterial ring, and present these in a table.

8. What is the difference between the effective refractory period and the relative refractory period?

Basically, arterial blood pressure (BP) is directly proportional to the product of blood flow (cardiac output, CO) and the resistance to passage of blood through pre-capillary arterioles (peripheral vascular resistance, PVR) Hypertension can be caused by either an increase in Cardiac Output (CO) or by an increase in Peripheral Resistance (PR)

>>Increasing the afferent arteriole radius pushed the glomerular pressure, the glomerular filtration rate, and the volume of urine to be higher than the baseline data. Increasing the afferent arteriole radius increased the glomerular filtration rate.

reports the amount of force exerted by the blood into the arteries during ventricular contraction.