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Zorluk: ZorCirculatory and Transport Systems in Animals

In a comparative study of vertebrate vascular systems, which of the following statements correctly distinguishes the route and pressure dynamics of oxygenated blood leaving the respiratory organs in a bony fish from that in an adult amphibian?

  1. In bony fish, oxygenated blood from the gills flows directly to systemic tissues under reduced pressure without returning first to the heart, whereas in amphibians, oxygenated blood returns to the heart's left atrium before being pumped to systemic tissues.Cevap
  2. B
    In bony fish, oxygenated blood returns directly to a two-chambered atrium under high pressure before systemic distribution, whereas in amphibians, blood bypasses the heart completely after lung gas exchange.
  3. C
    In bony fish, blood passes through a four-chambered heart twice during one circuit, whereas in amphibians, blood flows through a single-chambered tubular heart directly into the aorta.
  4. D
    In bony fish, oxygenated blood is pumped directly by the sinus venosus into the systemic arch, whereas in amphibians, oxygenated and deoxygenated blood are kept completely separate by a full muscular septum.

Cevap

In bony fish, oxygenated blood from the gills flows directly to systemic tissues under reduced pressure without returning first to the heart, whereas in amphibians, oxygenated blood returns to the heart's left atrium before being pumped to systemic tissues.
The statement accurately reflects single versus double circulation. In fish, blood passes through the heart only once per complete circuit; after being oxygenated in the gill capillaries, blood pressure drops significantly and flows directly into systemic arteries. In contrast, adult amphibians possess a double circulation system where oxygenated blood from the lungs returns first to the left atrium of the heart, allowing the ventricle to boost pressure before sending blood to the body.

Adım Adım Çözüm

1
Analyze the circulatory pathway of bony fish (Pisces).
Fish have a single-circuit circulation with a two-chambered heart. Deoxygenated blood is pumped from the single ventricle to the gill capillaries, where gas exchange occurs. Because blood passes through narrow gill capillaries, hydrostatic pressure drops significantly before reaching systemic capillaries.
Understanding single circulation mechanics in aquatic vertebrates.
2
Analyze the circulatory pathway of adult amphibians (Amphibia).
Amphibians have a double-circuit circulation with a three-chambered heart (two atria, one ventricle). Oxygenated blood from the lungs returns via pulmonary veins to the left atrium, allowing it to be repressurized by the ventricle for systemic distribution.
Understanding double circulation mechanics in terrestrial vertebrates.
3
Compare the route and pressure characteristics of both groups.
Fish blood goes Gills → Systemic Tissues (low pressure, single circuit), while Amphibian blood goes Lungs → Left Atrium → Ventricle → Systemic Tissues (repressurized double circuit).
Evaluating comparative anatomical and physiological differences.

Anahtar Kavram

Comparative Vertebrate Circulation (Single vs. Double Circulation Dynamics)
Tahmini Süre:2m 0s
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Konular

Circulatory and Transport Systems in Animals

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