The ___________ is the normal electrical connection between the atria and the ventricles where electrical impulses are delayed for a fraction of a second to allow the lower chambers to fill completely with blood.

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The Shropshire Star is ___________.

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The largest salivary gland which is located in front of the ear is the ___________ gland.

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It is in the ___________ that filtration occurs.

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The colon that travels down the left of the abdomen is called ___________.

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单选题

Between the atria and ventricles are atrioventricular valves, the right one is called ___________.

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