What is the name of the blood vessel that carries deoxygenated blood from the body to the heart in a

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Question

What is the name of the blood vessel that carries deoxygenated blood from the body to the heart in a frog?

Accepted Answer

Correct Answer: A — Vena cavaStep-by-step Solution:In frogs, the circulatory system follows a specific pattern of blood flow. Understanding the major blood vessels:Vena cava (Correct answer): The anterior vena cava (precaval vein) and posterior vena cava (postcaval vein) are the large veins that return deoxygenated blood from the body (systemic circulation) back to the right atrium of the three-chambered frog heart. This is directly analogous to the superior and inferior vena cava in mammals.Aorta (Wrong): The aorta (in frogs, the truncus arteriosus divides into right and left systemic arches/aortae) carries oxygenated blood AWAY from the heart to the body — it is an artery, not a vein.Pulmonary artery (Wrong): Carries deoxygenated blood FROM the heart TO the lungs (pulmonoscutaneous artery in frogs) — NOT from body to heart.Pulmonary vein (Wrong): Carries oxygenated blood FROM the lungs BACK TO the heart (left atrium) — it carries oxygenated, not deoxygenated blood.Extended Explanation:Blood flow in the frog heart (three-chambered: 2 atria + 1 ventricle): Deoxygenated blood from body → vena cava → right atrium; Oxygenated blood from lungs → pulmonary vein → left atrium; Both atria contract → blood mixes in the single ventricle (but spiral valve in truncus arteriosus partially separates oxygenated from deoxygenated blood); Ventricle contracts → truncus arteriosus → three arterial arches: (1) Carotid arches (to head/brain); (2) Systemic arches (to body — form dorsal aorta); (3) Pulmocutaneous arches (to lungs and skin — gas exchange). The incomplete separation in the frog ventricle means some mixing of oxygenated and deoxygenated blood occurs, making frog circulation less efficient than mammals (double circulation with complete separation). The renal portal system (hind limb veins → kidneys) and hepatic portal system (intestine → liver) are also present in frogs. In mammals: inferior/superior vena cava → right atrium → right ventricle → pulmonary artery → lungs → pulmonary veins → left atrium → left ventricle → aorta → body. Frog heart lacks a complete interventricular septum, but the spiral valve helps direct blood appropriately.Key Concepts: Frog circulatory system, vena cava (deoxygenated blood to heart), aorta (oxygenated blood from heart), pulmonary artery vs pulmonary vein, three-chambered heart, truncus arteriosus, portal systems in frogs.

What is the name of the blood vessel that carries deoxygenated blood from the body to the heart in a frog?

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What is the name of the blood vessel that carries deoxygenated blood from the body to the heart in a frog?

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