Lesson 2C Part2

Question 1

Capillary bed consists of

Answer 1

Aterioles, capillaries and venules

Question 2

Each beat of the heat proppels ___cc of blood from ventricle into the arterial tree

Answer 2

70

Question 3

Why must the hearts output be stored during systole

Answer 3

The capillary network cant keep up

Question 4

Each beat pumps approx ____ml of blood into aterial system

Answer 4

70ml

Question 5

Each minute approx ___ liters of blood is ejected

Answer 5

5 litres

Question 6

Even though the mean pressure gradually declines past the resistance vessel

Answer 6

The systolic portion of the pressure wave actually increase

Question 7

Why does systolic portion of pressure wave go up after resistant vesses

Answer 7

This phenomenon is due to increasing stiffness of the vessel walls toward the periphery and the reflected waves which are enhanced by increasing peripheral resistance

Question 8

In the circulatory system there are

Answer 8

High pressure, high energy arterial reseviour

Low pressure, low energy venous pool

Question 9

During diastole, energy stored in

Answer 9

The stretched elastic walls of the arteries

Question 10

Sotred elastic energy is used to

Answer 10

Propel blood forward through the peripheral resistance vessels

Question 11

The pressure is highest during ____ and lowest during

Answer 11

Highest during ventricular systole and lowest during ventricular diastole

Question 12

Normla patient blood pressure

Answer 12

120/80

Systolic/diastolic

Question 13

Aortic pressure

Answer 13

120mmHg

Question 14

Vena cava blood pressure

Answer 14

4mmHg

Question 15

how is energy lost in circulation? In the form of _____

Answer 15

Heat

Question 16

The resistance offered by the peripheral circulation is known as

Answer 16

Systemic vascular resistance

Question 17

The main resistance vessels are

Answer 17

Arterioles

Question 18

Simple flow model

Answer 18

An increase in resistance in a large distributing artery because of atheroma must be compensated by a decrease in the resistance of the small arteries and arterioles

Question 19

The compensation of dilation by arterioles eventually results in

Answer 19

Reduction of flow to organs and ischemia because no further dialation is possible. Any increase in the degree of stenosis leads to a reduction in flow

Question 20

Why are the arterioles considered autoregulatory

Answer 20

They dynamically change in diameter to increase or decrease flow

Happens during exercise

Question 21

3 sources of peripheral resistance

Answer 21

Blood viscosity
Blood vessel diameter
Total vessel length

Question 22

Viscosity determines (4)

Answer 22

Friction against vessel walls
Rate of venous return
Work required to pump the heart
How much oxygen is transported to tissues and organs

Question 23

Hemoconcentrated blood will flow

Answer 23

More steadily (higher velocity)

Question 24

What is hematocrit

Answer 24

The percentage of red blood cells in the total blood volume

Question 25

Hematocrit increases when

Answer 25

There are more red blood cells OR if there is less plasma

Question 26

Doubling the hematocrit does what to the viscosity

Answer 26

More than doubles

Question 27

Polycythemia is what

Answer 27

A condition of abnormal elevation in red cell hematocrit causing higher blood viscosity

Question 28

Anemia causes

Answer 28

Low hematocrit and reduced blood viscosity