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The atlas and axis forms a 

cytochrome c, when reduced, carries one electron.

When the sarcomere elongates, there is no calcium bound to troponin.

The SA node, gives us an autorhythmic sinus rhythm of about 100 beats/min, which is much higher than the average heart rate is 75 beats/min. This is because the resting heart rate is decreased when ___________ nervous system signals from the __________ nerve releases the neurotransmitter ___________ onto conduction system fibers.

The right side of the heart plays a role in _______________, while the left side of the heart plays a role in _______________.

During periods of physical activity increases in skeletal muscle pump activity, increased thoracic draw and constriction of veins all serve to increase venous return to the heart. This will increase stroke volume and cardiac output.

Which of the following BEST explains the changes in cardiac output observed during exercise?

A prolapsed tricuspid valve would allow blood to back flow into the right ventricle.

Select all correct answers. Which of the following induce local vasodilation and increased blood flow to a tissue?

Select all correct answers. Deoxygenated blood would be found in which of the following vessels?