___________bone formation occurs directly through a tight matrix of collagen fibers,which slowly calcify into bone.
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Q21: Smooth muscle is consciously controlled.
Q22: The foramen ovale closes during the third
Q24: The foramen ovale is an opening between
Q25: _ _appear in the third prenatal week
Q27: Name two hormones produced by the placenta.
Q30: Name three adult structures that are derived
Q30: The umbilical system carries oxygenated blood.
Q32: The cardiovascular system originates from chondroblasts.
Q34: The embryonic skeleton first forms as bone.
Q34: Blood cells begin to form in the
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