Exam 13:The Heart-Part B

The cardiac cycle is the sequence of events in _____________________________.

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

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

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

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

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

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

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

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

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

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

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

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

The outermost of the pericardial membranes is the ________________________ pericardium.