Term
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Definition
- Sinus, atrium, ventricle, and bulbous
- All contractile (musculature) except bulbous (elastic)
- Unidirectional flow of blood guaranteed by valves
- Single ventricle produces enough pressure for blood to flow from bulbous-->ventral aorta-->gills (high SA:V)-->dorsal aorta-->systemic circuit-->and return to sinus (deoxygenated).
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Term
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Definition
- Spiral fold in conus arteriosus separates blood based on O2 concentration
- Flow rate is inverse to resistance in an area; after a breath, flow to lungs is high (but decreases over time)
- Volumetric adjustments between blood to lungs and the body are possible
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Term
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Definition
- Horizontal septum divides the ventricle
- Cavum pulmonade-receive low O2 blood from the right atrium and ejects blood to the pulmonary artery
- Cavums venosum and arteriosum receive high O2 blood from left atrium and eject blood to systemic arches
- Pressure to open pulmonary valves < systemic; therefore, circulation to lungs occurs first
- Flow rate is high in air; but pulmonary flow and cardiac output decrease when submerged (Bradycardia)
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Term
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Definition
- When breathing air: all right ventricle blood flows to the pulmonary artery and left ventricle bloods flows to right systemic arch and (via Foramen of Panizzae) left systemic arch. Left systolic pressure is greater than right.
- When submerged: Blood is shunted from the pulmonary arch to systemic circulation via arterial constriction at the pulmonary artery and lungs. This constriction causes ventricle pressure to increase, opening the valve to the left sytemic side.
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