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user100 [1]
3 years ago
9

Although the most frequent forms of down syndrome are caused by a random error, nondisjunction of chromosome 21, down syndrome o

ccasionally runs in families. the cause of this form of familial down syndrome is ________.
Biology
1 answer:
den301095 [7]3 years ago
3 0
Genetic disorder facts
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SA node, or the sinus node, is the heart's natural pacemaker. AV node, or the atrioventricular node, spreads electrical impulses from the atria to the ventricles. The bundle of His, as well as bundle branches, are a part of the electrical conduction system of the heart. Purkinje fibers send nerve impulses through the heart.
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