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Zorluk: OrtaCirculatory and Transport Systems in Animals

Which vertebrate group possesses a heart with a single atrium and a single ventricle, through which only deoxygenated blood flows during a complete circulatory cycle?

  1. A
    Amphibia
  2. PiscesCevap
  3. C
    Reptilia
  4. D
    Aves

Cevap

Pisces (fishes) possess a two-chambered heart consisting of a single atrium and a single ventricle that pumps exclusively deoxygenated blood.
Members of the class Pisces (fishes) possess a simple two-chambered heart consisting of one atrium and one ventricle. Deoxygenated blood returning from the body tissues enters the sinus venosus, passes into the atrium, and is pumped by the ventricle to the gills for gas exchange. Because blood passes through the heart only once per complete circuit, it operates via single circulation and handles strictly deoxygenated blood.

Adım Adım Çözüm

1
Analyze the structural configuration of the vertebrate heart described in the question.
Identified a heart with two chambers: one atrium and one ventricle.
Different vertebrate classes showcase distinct evolutionary progressions in heart chamber numbers (from 2 in fish to 4 in birds and mammals).
2
Determine the nature of blood flow and circulatory pathway associated with this heart structure.
Blood flows in a single circuit (venous heart), where deoxygenated blood from body tissues enters the atrium, moves into the ventricle, and is pumped directly to the gills for oxygenation before circulating to the rest of the body.
Only fishes (Pisces) exhibit single circulation with a two-chambered heart pumping exclusively venous (deoxygenated) blood.

Anahtar Kavram

Vertebrate heart chamber evolution and single vs double circulation
Tahmini Süre:50s
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Konular

Circulatory and Transport Systems in Animals

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