Valves in veins are important features that help keep blood moving back toward the heart.
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Q44: Capillaries are essentially water-tight vessels,so nutrients and
Q45: Because they are cell fragments,not cells,platelets are
Q46: Some proteins are too large to leave
Q47: When the thoracic cavity gets smaller,the pressure
Q48: The left ventricle pumps blood into the
Q50: The stimuli for contraction of the heart
Q51: Ions in plasma are also known as
Q52: Blockage of the aorta is the most
Q53: Water and plasma proteins make up about
Q54: Veins are smaller blood vessels than capillaries.
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