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The Importance Of Arteries In The Human Body

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Arteries – Arteries carry blood away from the heart and toward the body tissues
-Arterioles direct blood where it is needed within the body; more blood is sent to active tissues and organs, and less blood is sent to less active tissues and organs. This is accomplished through vasodilation and vasoconstriction.
- Veins carry blood back to the heart from the body tissues
- Venules are small veins that also conduct blood back to the heart from the body tissues
- Capillaries are responsible for the exchange of nutrients, gases, and waste products between the blood and body cells The arterial system of pigeon is shown in the Fig. 20.16
Major Arteries:
- Carotids: conducts blood to the head and brain (Fig. 20.16)
- Brachials: carry blood to the wings
- Pectorals: carry blood to the pectoralis, or flight, muscles
- Systemic arch: also known as the aorta; conducts blood to all areas of the body except the lungs
- Pulmonary …show more content…

20.17)
- Brachials: carry blood away from the wings
- Pectorals: drain the pectoral muscles and anterior thorax
- Superior vena cava (precava): carry blood from the anterior regions of the body
- Inferior vena cava (postcava): take blood away from the posterior region of the bird
- Hepatic vein empties blood from the liver
- Hepatic portal: takes blood away from the digestive system
- Coccygeomesenteric: empties the posterior digestive system and the hepatic portal vein
- Femorals: carry blood away from the legs
- Sciatic veins: drain the thigh area of blood
- Renal and renal portal veins: take blood away from the kidneys

Fig. 20.17 Venous system of

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