Reticulation
- reticulation is delivery and removal networks which are required as working tissues must be well supplied with nutrients (or fuels) and well scavenged of wastes. Tissues with high work levels (eg. muscles) have closest reticular association compared with tissues such as articular cartilage which receives nutrients via diffusion. The problem with diffusion, however, is that while it is very quick over short distances it i very slow over long distances hence as animals get larger bulk delivery systems are required. The three components in the reticular network that operate together are; arterial supply, venous removal and lymphatic removal.
Particulate fluids.
- Blood is a particulate fluid of which the fluid components (water and dissolved solutes) enter and leave the cardiovascular system, The particulate component, such as cells and other insoluble molecules usually stay within the cardiovascular system. Particulate fluids in general are more complicated than simple fluids, however they still flow in response to energy gradients. Pressure is used as a measure of energy and hence static pressure is the equivalent potential energy and dynamic pressure is th equivalent kinetic energy. Osmotic pressure is also very important in the diffusion zone.
Cardiac Output
-This s highly pulsatile and delivered into the aorta which contains elastic walls that stretch under pressure, the recoil extends the pressure wave and drives fluid down the tube. Distance between the aorta and periphery is spanned by relatively few arteries of large diameter.
Capillary Bed
- the capillary bed has a huge increase in vessel numbers and even though the vessels are short, the retention time is about 75x that of the aorta, allowing increased time for gas exchange (diffusion).
Venous Return
- This has the largest volume of the cardiovascular system and is a reservoir for the heart in times of need. Venous return can be difficult with veins being thin walled with a large diaeter and so is assisted by valves, external muscles in path and the muscles in wall.
Lymphatic Drainage
-not all fluid returns to venules, some fluid is lost to the interstitium which flows into lymph ducts/lacteals which don't have barriers and so it takes with it large molecules, antigens and cellular debris. Lymph vessels are thin-walled with valves and no musc and so, like veins, are also assisted by muscle massaging.
Learn More
WikiVet: Lymphatic System
WikiVet: Cardiorespiratory System
Crash Course Anatomy: Blood Vessels Part I
Crash Course Anatomy: Blood Vessels Part II
Knowledge Testing
1. what is reticulation and why is it important?
2. what are the 3 components that make up the reticular system?
Concept Testing.
1. Discuss why arteries tend to be more reinforced in their structure than veins.
2. Describe how static pressure is the equivalent potential energy and how dynamic pressure is the equivalent kinetic energy.
- reticulation is delivery and removal networks which are required as working tissues must be well supplied with nutrients (or fuels) and well scavenged of wastes. Tissues with high work levels (eg. muscles) have closest reticular association compared with tissues such as articular cartilage which receives nutrients via diffusion. The problem with diffusion, however, is that while it is very quick over short distances it i very slow over long distances hence as animals get larger bulk delivery systems are required. The three components in the reticular network that operate together are; arterial supply, venous removal and lymphatic removal.
Particulate fluids.
- Blood is a particulate fluid of which the fluid components (water and dissolved solutes) enter and leave the cardiovascular system, The particulate component, such as cells and other insoluble molecules usually stay within the cardiovascular system. Particulate fluids in general are more complicated than simple fluids, however they still flow in response to energy gradients. Pressure is used as a measure of energy and hence static pressure is the equivalent potential energy and dynamic pressure is th equivalent kinetic energy. Osmotic pressure is also very important in the diffusion zone.
Cardiac Output
-This s highly pulsatile and delivered into the aorta which contains elastic walls that stretch under pressure, the recoil extends the pressure wave and drives fluid down the tube. Distance between the aorta and periphery is spanned by relatively few arteries of large diameter.
Capillary Bed
- the capillary bed has a huge increase in vessel numbers and even though the vessels are short, the retention time is about 75x that of the aorta, allowing increased time for gas exchange (diffusion).
Venous Return
- This has the largest volume of the cardiovascular system and is a reservoir for the heart in times of need. Venous return can be difficult with veins being thin walled with a large diaeter and so is assisted by valves, external muscles in path and the muscles in wall.
Lymphatic Drainage
-not all fluid returns to venules, some fluid is lost to the interstitium which flows into lymph ducts/lacteals which don't have barriers and so it takes with it large molecules, antigens and cellular debris. Lymph vessels are thin-walled with valves and no musc and so, like veins, are also assisted by muscle massaging.
Learn More
WikiVet: Lymphatic System
WikiVet: Cardiorespiratory System
Crash Course Anatomy: Blood Vessels Part I
Crash Course Anatomy: Blood Vessels Part II
Knowledge Testing
1. what is reticulation and why is it important?
2. what are the 3 components that make up the reticular system?
Concept Testing.
1. Discuss why arteries tend to be more reinforced in their structure than veins.
2. Describe how static pressure is the equivalent potential energy and how dynamic pressure is the equivalent kinetic energy.