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Comparative Anatomy: Circulatory Systems in Vertebrates

Comparative Anatomy: Circulatory Systems in Vertebrates. Warm-up: What are the functions of the circulatory system? How does the circulatory system depend on the respiratory system? Do you think endotherms or Ectotherms need more efficient circulatory systems? Justify your answer.

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Comparative Anatomy: Circulatory Systems in Vertebrates

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  1. Comparative Anatomy: Circulatory Systems in Vertebrates Warm-up: What are the functions of the circulatory system? How does the circulatory system depend on the respiratory system? Do you think endotherms or Ectotherms need more efficient circulatory systems? Justify your answer.

  2. Structures and Functions of the Circulatory System Functions Transports nutrients, oxygen, waste, hormones, and cells throughout the body. Helps stabilize body temperature Maintains the pH inside the body

  3. Structures and Functions of the Circulatory System Functions Transports nutrients, oxygen, waste, hormones, and cells throughout the body. Helps stabilize body temperature Maintains the pH inside the body Structures Heart Blood Blood vessels: Veins, Arteries and Capillaries

  4. Class OsteichthyesInternal Transport • Closed circulatory system-blood is contained within blood vessels such as veins, arteries, and capillaries • Two-chambered heart (atrium, ventricle)

  5. Class Amphibia: Internal Transport • Adults: Three chambered heart • Improved heart to deliver more oxygen to walking muscles. • Tadpoles have a two-chambered heart

  6. Quick Question #1 What selective pressures would lead to the development of a third chamber in the heart of Amphibians?

  7. Class Reptilia: Internal Transport • Can be argued that they have a three or four chamber heart (both are correct) • Crocodiles have a four chambered heart. All others have a partially devided ventricle

  8. Class Aves: Internal Transport • Four-chambered heart

  9. Quick Questions #2 and #3 -Why Would Birds need a fourth chamber to their heart? -Review: How are Avian Respiratory systems more efficient than other classes?

  10. Class Mammalia: Internal Transport • 4-chambered heart

  11. Quick Question #4 -Why do Endotherms need a Fourth Chamber to their Heart?

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