B3W1 Arteries and Veins

Question 1

Changes in Overall Pressure

Answer 1

Within a closed system the amount of resistance does not change drastically

Question 2

Branching vessels areas in the body

Answer 2

The cross sectional area of branches off of a vessel when summed together are more than the original vessel

Question 3

Cross sectional area Mean linear velocity relationship

Answer 3

Higher cross sectional area causes a lower mean linear velocity

Question 4

Fluid Velocity in a Cylinder

Answer 4

Velocity = Flow/Cross-Sectional Area

Question 5

Aggregate Cross-Sectional Area and Mean Linear Velocity

Answer 5

Flow total = A1V1 = A2V2… etc.
Flow remains constant overall
Flow changes within individual vessels

Question 6

Blood volume

Answer 6

Systemic 85% Pulmonary 10%
High Pressure 15% Low Pressure 80%
Systemic Arterial 20% Systemic Venous 65% Pulmonary 10%

Heart Chambers always around 5%

Question 7

Transit Time

Answer 7

Time it takes for a blood cell to moves through the entire circulatory system
In reality hard to measure because blood cells do not always go through the same paths through the system

Question 8

Transmural Pressure Profiles

Answer 8

Pressure decreases the most within the arterioles than in the capillaries

This is because capillaries are parallel and arterioles are in series

This means that resistance spreads out among capillaries but is summed together for arterioles

Question 9

Capillary Pressure

Answer 9

Precapillary pressure is higher than post capillary