Name the 3 parts of the circulation
- Resistance part (Arteries)
- Exchange area (Capillaires)
- Reservoir (Veins)
Location of resistance part of the circulation
Left ventricle → Capillary bed
Location of the exchange area of the circulation
Locations of bidirectional transport of material
Location of the reservoir system of the circulation
Venules → Right atrium
Under normal conditions, the largest part of blood volume is located in...
The reservoir system
Describe the structure of an artery
- Thick walled
Describe the structure of an arteriole
- Little connective tissue
Describe the structure of a capillary
- Endothelial layer
- No muscle
Describe the structure of a venule
- Thin walls
- Some smooth muscle
Describe the structure of a vein
- Smooth muscle
The resistance part is composed of...
- Elastic arteries
- Muscular arteries
- Aorta & large arteries
- Loaction of passive contraction (due to elastic elements)
Muscular arteries are the sites of...
- Regulated resistance
- Smooth muscle → active contraction
- Most important part of regulated resistance
During diastole, the aorta...
'Windkessel' function of the aorta
- A simple pump with a closed air buffer
- Storage of pressure in the Windkessel
- Results in a near-constant pressure
What is the location of capillary exchange?
Area of microcirculation
List the types of capillary
Location of continuous capillaries
Location of the fenestrated capillaries
- Intestinal mucosa
- Endocrine glands
Location of the porous capillaries
Glomeruli of the kidney
Describe the structure of continuous capillaries
- Endothelium (Inside layer)
- Lamin basalis
- Pericytes (Outside layer)
Sinusoid capillaries lack...
Location of sinusoid capillaries
- Haemopoietic organs
What limits the enlargement of veins?
List the types of Venule
- Postcapillary venule
- Collecting venule
- Muscular venule
The function of venules is determined by...
The structure of the wall and valves
The pressure exerted onto the wall of the container (vessels)
Kinetic energy =
1/2 m x v2