Examlex
In vertebrates, the brain and spinal cord make up the _______ nervous system.
Tricuspid Valve
A valve in the human heart that lies between the right atrium and the right ventricle, regulating blood flow.
Right Atrium
The upper right chamber of the heart that receives deoxygenated blood from the body and pumps it to the right ventricle.
Diastole
The phase of the heartbeat when the heart muscle relaxes and allows the chambers to fill with blood.
Systole
The stage in the heart's rhythm where the cardiac muscle tightens, forcing blood out of its chambers and into the arterial network.
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