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The part of the heart muscle that usually depolarizes first in a heartbeat is the ______________________.

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The heart is ____________________ to the diaphragm and _______________ to the lungs.

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The response to a sudden drop in blood pressure is a rapid _________________________ in heart rate,brought about by ______________________nerve impulses.

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increase,s...

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The outermost of the pericardial membranes is the ________________________ pericardium.

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The carotid and aortic bodies contain ______________________ to detect changes in ________________________.

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chemorecep...

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The electrical impulses for the heartbeat pass from the _____________________ of the atria to the _______________________ in the ventricles.

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AV node,AV...

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The ventricle that has thicker walls is the ________________,because it must pump blood throughout the ______________________.

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The layer of the heart wall that pumps blood is the ____________________________.

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The cardiac cycle is the sequence of events in _____________________________.

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The tricuspid valve prevents backflow of blood from the ________________________ to the ___________________________.

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right vent...

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The heart is located in an area called the ___________________________,and is protected by the ____________________________.

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mediastinu...

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The heart rate is increased by impulses carried by _____________________ nerves.

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The endocardium is the _____________ of the heart,and its function is to _____________________.

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lining,pre...

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Impulses carried by sympathetic nerves to the heart will ______________________ the heart rate.

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