Circulation
Circulatory system
1. Pump
2. System of tubular vessels or passages
3. Blood
Circulation
Pressure driven bulk flow of body through vessels or passages to supply all parts of the body
Rapid transport of:
- Gases
- Nutrients
Capacity to transport O2 has evolved to support metabolic intensity
- Diffusion (small animals)- slow
- Convective transport (large animals)- faster
Blood flow must be regulated
Heart
The heart is a discrete, localised pumping system
Hearts have different structure depending on the animal
Common in most circulatory systems
- Annelids use peristaltic movement
Single chambered
- Arthropods
Multi-chambered
- Human heart (2A n 2V)
Secondary hearts
- Accessory hearts (auxillary hearts)
Cardiac myocardium
Muscle tissue of the heart
- Requires O2 supply
- Packing of heart cells restricts flow into the myocardium
- Coronary circulation
4 systems evolved by animals to supply O2 to the myocardium
Circulatory system
1. Pump
2. System of tubular vessels or passages
3. Blood
Circulation
Pressure driven bulk flow of body through vessels or passages to supply all parts of the body
Rapid transport of:
- Gases
- Nutrients
Capacity to transport O2 has evolved to support metabolic intensity
- Diffusion (small animals)- slow
- Convective transport (large animals)- faster
Blood flow must be regulated
Heart
The heart is a discrete, localised pumping system
Hearts have different structure depending on the animal
Common in most circulatory systems
- Annelids use peristaltic movement
Single chambered
- Arthropods
Multi-chambered
- Human heart (2A n 2V)
Secondary hearts
- Accessory hearts (auxillary hearts)
Cardiac myocardium
Muscle tissue of the heart
- Requires O2 supply
- Packing of heart cells restricts flow into the myocardium
- Coronary circulation
4 systems evolved by animals to supply O2 to the myocardium
