Thick muscle wall, narrow lumen, and thick connective tissue describes

Which are the characteristics of blood flowing through most arteries and veins

The endocrine system can increase heart rate by releasing

When the tricuspid valve is open, the

The SL valves close due to

Blood from the right ventricle moves into the

Oxygen rich blood returns to the heart through the

Which valve prevents the back-flow of blood into the left atrium

Term to describe the fact the heart ca beat on its own

The first heart sound is due to

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