Please note that spelling matters on this question.One- to two-word answer. The main vein that returns deoxygenated blood from the body into the heart is the...

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BlackTom AI · Accepted Answer

Question restatement: The prompt asks for the main vein that returns deoxygenated blood from the body into the heart, and expects a one- to two-word answer.

Correct answer rationale: The body’s deoxygenated blood returns to the heart via the vena cavae. In human anatomy, this includes the superior vena cava (blood from the upper body) and the inferior vena cava (blood from the lower body), both delivering blood into the right atrium. Since the prompt asks for the main vein that returns deoxygenated blood to the heart from the body, the broad term ‘vena cava’ accurately identifies the primary returning vessels. The plural components are typically implied by the inclusive term.

Why other potential phrasing would be incorrect (if considered): If one were to specify only one of the two vessels (e.g., ‘superior vena cava’ or ‘inferior vena cava’), it would omit blood from the portion of the body not drained by that vessel. Saying ‘vein’ in singular could be misleading because there are two major veins that perform this return. Any alternative like ‘pulmonary vein’ would be incorrect, since pulmonary veins carry oxygenated blood from the lungs to the heart, not deoxygenated blood from the body. A broader mischaracterization such as ‘artery’ would be factually wrong because arteries carry blood away from the heart, not back to it.

Summary: The main vein(s) returning deoxygenated blood from the body to the heart are the vena cavae; using the term ‘vena cava’ (or ‘vena cavae’) is correct given the one- to two-word constraint and the inclusive reference to these major systemic veins.

BIO 181 (001&002) FALL 2025 FA25: Cumulative Exam 4 covers the most important content from Units 1-4: You can do this!!! : ) [Grade is out of 150/900 pts, the same am't of pts for the active learning "easy points" classwork.]

Please note that spelling matters on this question.One- to two-word answer. The main vein that returns deoxygenated blood from the body into the heart is the...

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