Unformatted text preview: few degrees or pHs we will die. • Open vs. Closed Circulatory system: Circulating fluid, interconnecting tubes, pump (heart) • Open System: easy to maintain, but not a demanding system. • Closed system: Huge strain, but can live as a ectodermic. • Fish, rays, sharks have this single circulation system with one ventricle and one atrium. • MEMORIZE THE CHAMBERS IN THE HEART • Higher animals have evolved more complex circulatory system. Veins and atriums are distinguished by direction and not oxygenation. Note distinct pulmonary and systemic circuits. The Human Heart • Beats 72 times per minute •...
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- Spring '09
- cardiovascular system, Internal Environment Evolution