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Terms in this set (20)
The pulmonary valve is situated between:
The right ventricle and pulmonary artery
What is the purpose of the coronary arteries?
To supply the heart with blood for its own metabolic needs
________ circulation carries deoxygenated blood to alveoli in the lungs where gas exchange occurs between blood and air in the lungs.
The electrical impulses that initiate the heartbeat normally originate from the:
The refractory period that follows depolarization and repolarization in the cardiac cycle is important because during this time:
The heart cannot contract, preventing periods of sustained contraction
THe right side of the heart pumps blood into __________ circulation.
_______ are part of the blood-clotting system and release substances that promote blood clotting.
The term "ventricular systole" describes the phase of the cardiac cycle in which:
The ventricles contract and eject blood from the heart
________ trasnport(s) oxygen in the blood.
Red blood cells
Throughout most of the body, ________ carry blood away from the heart and are depicted graphically by the color _________.
Electrical changes, called ________, initiate contraction in cardiac myocytes.
Most of the exchange oxygen, nutrients, waste products, and other substances between the blood and the interstitial fluid occurs in the:
The ______ is the largest artery in the body and exits from the left ventricle of the heart.
Smooth muscle cells in the walls of arteries enable them to narrow and widen. When arteries narrow, the result is typically called:
The primary purpose of the cardiovascular system is best described as:
Delivery of oxygen and nutrients to tissues and removal of wastes
Which chamber of the heart has the thickest muscular layer?
Which type of blood vessel has the most muscular walls?
Which vessels are sometimes referred to as "capacitance vessels" because they act as reservoirs for blood?
Blood is systemic circulation returns to the heart via the:
Superior and inferior vena cava
The muscular layer of the heart wall that contains contractile muscle cells is called the:
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