Содержание
- 2. Heart anatomy
- 3. blood versells ARTERY VEIN CAPILLARY
- 4. Human blood vessels: arteries, veins and capillaries
- 5. Arteries are strong, elastic vessels that are designed to carry blood away from the heart under
- 6. The wall of an artery consists of three distinct layers. The innermost layer, tunica intima, is
- 7. Venules are microscopic vessels that continue from the capillaries and merge to form veins. The veins,
- 10. Скачать презентацию
Heart anatomy
Heart anatomy
blood versells
ARTERY
VEIN CAPILLARY
blood versells
ARTERY
VEIN CAPILLARY
Human blood vessels: arteries, veins and capillaries
Human blood vessels: arteries, veins and capillaries
Arteries are strong, elastic vessels that are designed to carry
Arteries are strong, elastic vessels that are designed to carry
The wall of an artery consists of three distinct layers. The
The wall of an artery consists of three distinct layers. The
Venules are microscopic vessels that continue from the capillaries and merge
Venules are microscopic vessels that continue from the capillaries and merge
The walls of veins are similar to those of arteries in that they are composed of three distinct layers. Because the middle layer of the venous wall is poorly developed, however, veins have thinner walls and contain less smooth muscle and less elastic tissue than comparable arteries.
Many veins, particularly those in the arms and legs, contain flaplike valves, which project inward from their linings. These valves are usually composed of two leaflets that close if the blood begins to back up in a vein. In other words, the valves aid in returning blood to the heart, since the valves open as long as the flow is toward the heart, but close if flow is in the opposite direction.