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Flashcards in Part 1 Deck (61)
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1

Delivering adequate oxygen & nutrients to the systemic tissues and removing carbon dioxide and other waste products from the systemic tissues is the main function of?

Systemic Circulation

2

Systemic circulation serves as a conduit for transport of hormones and other substances and it allows these substances to?

Potentially act at a distant site from their production

3

What are designed to carry blood under high pressure out to the tissue beds?

Systemic Arteries

4

What act as control valves to regulate local flow?

Arterioles and Pre-capillary Sphincters

5

Capillaries (one cell layer thick) exchange between?

Tissue (cells) and blood

6

Venules collect blood from?

Capillaries

7

What returns blood to the heart/dynamic storage?

Systemic Veins

8

Blood flow is proportional to?

Metabolic Demand

9

Cardiac output is controlled by?

Local Tissue Flow

10

What is independent of local flow or cardiac output?

Arterial Pressure Control

11

What are the components of vessels?

1. Endothelium ( 1 layer in all vessels)
2. Elastic Tissue
3. Smooth Muscle
4. Fibrous Tissue

12

The relative composition of the aorta is?

1 >3 >2

13

The relative composition of a typical artery is?

2 > 1 > 3

14

The relative composition of a vein is?

1=2=3

15

The relative composition of a capillary is?

Only endothelium

16

What is the volume of blood that passes a certain point per unit of time (e.g.. ml/min) ?

Flow (F)

17

At a given flow, the velocity is inversely proportional to the?

Total cross sectional area
F = velocity x cross sectional area

18

Flow is directly proportional to the change in pressure and inversely proportional to?

Resistance (R)
F = change in pressure/R

19

What is the driving force of blood?

Pressure Gradient

20

Pressure gradient is the difference in?

Pressure between two points

21

Pressure gradient is proportional to?

Flow

22

At a given flow, the greater the drop in pressure in a segment or compartment the greater the?

Resistance to flow

23

The greatest resistance to flow occurs in the?

Pre-capillary resistance vessels (arterioles, metaarterioles, precapillary sphincters)

24

Resistance equals?

8nl/pi r^4
n=viscosity
l=length of vessel
r=radius

25

A parallel circuits is?

Rt< smallest individual R

26

A series circuit is?

Rt = sum of individual R's

27

The systemic circulation is predominantly a?

Parallel circuit

28

Parallel circuitry is independent of?

Local Flow Control

29

Parallel circuitry increases or decreases?

Flow to tissues independently

30

Parallel circuitry minimizes?

Total Peripheral Resistance (TPR)