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Difficulty: EasyCirculatory and Transport Systems in Animals

Match each animal group in the left column with its characteristic circulatory pattern or heart structure in the right column.

  • InsectsOpen circulatory system where hemolymph bathes tissues directly in body cavities
  • FishesSingle circulation loop with a two-chambered heart consisting of one atrium and one ventricle
  • AmphibiansDouble circulation with a three-chambered heart consisting of two atria and a single ventricle
  • MammalsComplete double circulation with a four-chambered heart preventing mixing of oxygenated and deoxygenated blood

Answer

Insects match with open circulatory system where hemolymph bathes tissues directly in body cavities; Fishes match with single circulation loop with a two-chambered heart consisting of one atrium and one ventricle; Amphibians match with double circulation with a three-chambered heart consisting of two atria and a single ventricle; Mammals match with complete double circulation with a four-chambered heart preventing mixing of oxygenated and deoxygenated blood.
Each animal taxon exhibits structural adaptations in its transport system: Insects utilize an open circulatory system with hemolymph bathing the hemocoel. Fishes feature a two-chambered heart that pumps blood through a single circuit (heart to gills to body). Amphibians have a three-chambered heart driving double circulation with partial ventricular blood mixing. Mammals possess a four-chambered heart ensuring double circulation with complete separation of oxygenated and deoxygenated blood.

Step-by-Step Solution

1
Identify the circulatory system type in invertebrates such as insects
Insects have an open system utilizing hemolymph inside a hemocoel rather than closed blood vessels
Arthropods do not rely on closed vascular pathways for internal fluid movement
2
Recall the heart chamber count and circulatory route in aquatic vertebrates (fishes)
Fishes feature a two-chambered heart (one atrium, one ventricle) driving single circulation
Blood passes through the heart only once during a complete circuit around the body
3
Differentiate amphibian cardiac anatomy from higher homoiothermic vertebrates
Amphibians possess three heart chambers (two atria, one undivided ventricle)
Double circulation is present, but blood mixes partially within the single ventricle
4
Identify the cardiovascular features of homoiothermic vertebrates (mammals)
Mammals have a four-chambered heart providing complete separation of blood circuits
Efficient oxygen delivery requires unmixed oxygenated blood for high metabolic rates

Key Concept

Comparative Vertebrate and Invertebrate Circulatory Systems
Estimated Time:45s
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Topics

Circulatory and Transport Systems in Animals

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