The impulses that cause the heart to beat come from which of the following?
a) groups of specialized muscle cells
b) the nervous system
c) the endocrine system
d) Breathing
Ans: a) groups of specialized muscle cells
Anatomy & Physiology
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An increase in a membranes permeability to Na+ will result in __________ of the membrane.
Fill in the blank(s) with the appropriate word(s).
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-medulla oblongata. -cerebral cortex. -medial geniculate. -olfactory bulb. -olfactory tract
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