Flashcards in Part 1 Deck (61)
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 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
What are designed to carry blood under high pressure out to the tissue beds?
What act as control valves to regulate local flow?
Arterioles and Pre-capillary Sphincters
Capillaries (one cell layer thick) exchange between?
Tissue (cells) and blood
Venules collect blood from?
What returns blood to the heart/dynamic storage?
Blood flow is proportional to?
Cardiac output is controlled by?
Local Tissue Flow
What is independent of local flow or cardiac output?
Arterial Pressure Control
What are the components of vessels?
1. Endothelium ( 1 layer in all vessels)
2. Elastic Tissue
3. Smooth Muscle
4. Fibrous Tissue
The relative composition of the aorta is?
1 >3 >2
The relative composition of a typical artery is?
2 > 1 > 3
The relative composition of a vein is?
The relative composition of a capillary is?
What is the volume of blood that passes a certain point per unit of time (e.g.. ml/min) ?
At a given flow, the velocity is inversely proportional to the?
Total cross sectional area
F = velocity x cross sectional area
Flow is directly proportional to the change in pressure and inversely proportional to?
F = change in pressure/R
What is the driving force of blood?
Pressure gradient is the difference in?
Pressure between two points
Pressure gradient is proportional to?
At a given flow, the greater the drop in pressure in a segment or compartment the greater the?
Resistance to flow
The greatest resistance to flow occurs in the?
Pre-capillary resistance vessels (arterioles, metaarterioles, precapillary sphincters)
l=length of vessel
A parallel circuits is?
Rt< smallest individual R
A series circuit is?
Rt = sum of individual R's
The systemic circulation is predominantly a?
Parallel circuitry is independent of?
Local Flow Control
Parallel circuitry increases or decreases?
Flow to tissues independently