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lab9: circulatory
| Question | Answer |
|---|---|
| Chondrichthyes primary respiration | Gills |
| Chondrichthyes aortic arches | Typically 5 pairs, no arch 1, arch ii-vi present |
| Chondrichthyes heart structure | Venous Heart (1 Atrium, 1 Ventricle). |
| Chondrichthyes circulatory system | Single circuit; Arches pass through gills for oxygenation. Venous heart. Linear |
| Actinopterygii primary respiration | Aquatic (Gills |
| Actinopterygii aortic arches | Primarily Arches III-VI (I & II lost or modified). The carotid arteries branch from Arch III giving oxygen to head. |
| Actinopterygii heart structure | Venous Heart (1 Atrium, 1 Ventricle). 2 Primary Chambers (one atrium one ventricle) plus 2 Accessory Chambers (sinus venosus and conus arteriosus). |
| Actinopterygii circulatory system | Single circuit; Non-air-breathing retain primitive condition. Venous heart. Heart pumps deoxygenated blood to gills. Arches carry blood to the gills for oxygenation before systemic flow. |
| Air-Breathing Actinopterygii respiration | Bimodal (Gills + Lungs) |
| Air-Breathing Actinopterygii aortic arches | Pulmonary arteries form as outgrowths of Arch VI. Arches V & VI associated with gills. |
| Air-Breathing Actinopterygii heart | 2 complete or incomplete Atria, 1 Ventricle (with partial septation in lungfish). Spiral valve present. |
| Air-Breathing Actinopterygii circulatory system | Bimodal heart function; shunts direct blood to lungs when breathing air; pulmonary circuit exists. |
| Lissamphibia (Frogs, Salamanders) respiration | Bimodal (Cutaneous + Lungs/Gills) |
| Lissamphibia (Frogs, Salamanders) aortic arches | Only Arches III (Carotid), IV (Systemic), and VI (Pulmonary) persist. Arch VI becomes pulmocutaneous in some. |
| Lissamphibia (Frogs, Salamanders) heart | 2 Atria (full/partial interatrial septum), 1 Ventricle (typically no interventricular septum). Spiral valve present. |
| Lissamphibia (Frogs, Salamanders) circulatory system | Double circulation (pulmonary & systemic); relies on trabeculation and spiral valve to minimize mixing in the single ventricle. |
| Amniota (General) respiration | Aerial (Lungs) |
| Amniota (General) aortic arches | Arches III, IV, & VI persist (Carotid, Systemic, & Pulmonary arteries). |
| Amniota (General) heart | Varies |
| Amniota (General) circulatory system | Two circuits (systemic and pulmonary). |
| amniota: aves respiration | Aerial (Lungs) |
| amniota: aves aortic arches | Only Right Arch IV retained as the single systemic artery. |
| amniota: aves heart | Complete Dual-Pump: 2 complete Atria, 2 completely divided Ventricles. |
| amniota: aves circulatory system | Total separation of systemic and pulmonary circuits. Right systemic arch. Vestigial Sinus Venosus. |
| amniota: mammal respiration | Aerial (Lungs) |
| amniota: mammal aortic arches | Only Left Arch IV retained as the single systemic artery (aorta). |
| amniota: mammal heart | Complete Dual-Pump: 2 complete Atria, 2 completely divided Ventricles. |
| amniota: mammal circulatory system | Total separation of systemic and pulmonary circuits. Left systemic arch. Sinus Venosus lost in adult. |
| amniota: testudines respiration | Aerial (Lungs) / Aquatic (Diving) |
| amniota: testudines aortic arches | Arches III, IV, & VI persist. |
| amniota: testudines heart | 2 complete Atria, 1 Ventricle with two incomplete septa (vertical & predominant horizontal). |
| amniota: testudines circulatory system | Shunting ability via pulmonary sphincter on Arch VI allows blood to bypass lungs while diving. Minimal mixing maintained by septa and pressure differentials. |
| Amniota: cocodilians respiration | Aerial (Lungs) / Aquatic (Diving) |
| Amniota: cocodilians aortic arches | Arches III, IV, & VI persist. |
| Amniota: cocodilians heart | 2 complete Atria, 2 completely divided Ventricles. Two systemic aortae (one from each ventricle). |
| Amniota: cocodilians circulatory system | Four-chambered heart but maintains the ability to shunt blood via the Foramen of Panizza while diving, bypassing the lungs.separate pulmonary and systemic. |