An artificial pacemaker supplements the actions of

a. sympathetic neurons.
b. the atrioventricular node.
c. the medulla oblongata.
d. the sinoatrial node.
e. the heart muscle itself


Answer: d

Biology & Microbiology

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Fill in the blank(s) with the appropriate word(s).

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Lyell's theory of uniformity is the idea that ________

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The structure of C3 plants allows RuBP carboxylase to bind with ____ during photorespiration.

What will be an ideal response?

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Which type of fermentation occurs in the bacteria found in yogurt?

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