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18. Which of the following do not aid venous blood return to the heart. A. muscle contraction (muscle milking) B. breathing (
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Ans18) Option D is correct,thinner walls of veins do not aid venoys blood return to the heart.

Ans19) None of the key choices-Hypophyseal portal system in adult.

Ans20) Highly oxygenated blood-Umblical artery in a fetus.

Ans21)Highly oxygenated blood- Umblical vein in a fetus.

Ans22) Highly oxygenated blood-Adult aorta.

Ans23)Highly oxygenated blood- Fetus aorta.

Ans24)Moderate to very low oxygenated blood- Inferior vena cava in an adult.

Ans25)Highly oxygenated blood- Inferior vena cava in a fetus.

Ans26) Moderate to very low oxygenated blood-Adult pulmonary artery.

Ans27)Highly oxygenated blood- Adult pulmonary vein.

Ans28)Highly oxygenated blood- Adult carotid artery.

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