Respiration_and_Circulation

Respiration_and_Circulation - Respiration and Circulation...

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Respiration and Circulation Birds have a very high metabolic rate. This is primarily associated with: 1. Endothermy 2. Ability to fly
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Circulatory System Bird’s circulatory system: In structure , most similar to reptiles In function , most similar to mammals Structure like reptiles : 1. Nucleated red blood cells 2. Aortic arch bends to right (not left) 3. Renal portal system (venous blood goes into kidneys) Function like mammals : 4-chambered heart means 1. Pulmonary and systemic circulations can be independent (different pressures) 2. No mixing of oxygenated and unoxygenated blood
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The general pattern of circulation should seem familiar to you: Right aortic arch Left ventricle wall is thick! Hepatic portal system
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3 things to note about circulatory system 1. Arteries that go to chest (pectoralis) are MUCH larger than in mammals 2. Arteries and veins that go to head run along spine, not on sides of neck 3. Renal portal system
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That’s how it’s set up How well does it work? Blood Pressure:
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This document was uploaded on 08/24/2011.

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Respiration_and_Circulation - Respiration and Circulation...

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