A&P15 Cardiovascular System

The heart pumps about ____ liters of blood a day and contracts about _____ times in a lifetime.  

• 1,000 liters; 1 billion
• 1,200 liters; 2 billion
• 3,000 liters; 2 billion
• 7,000 liters; 2.5 billion

Circulation is vital because it  

• supplies oxygen and nutrients to and removes wastes from tissues.
• inflates the lungs.
• delivers carbon dioxide to tissues and removes excess oxygen.
• delivers wastes to tissues.

The pulmonary circuit  

• sends oxygen-poor blood to the heart.
• sends oxygen-poor blood to the tissues.
• sends oxygen-poor blood to the lungs.
• brings oxygen-rich blood from the tissues.

The systemic circuit  

• sends oxygen-poor blood to the heart.
• brings oxygen-rich blood from the tissues.
• brings oxygen-poor blood from the lungs.
• sends oxygen-rich blood to the tissues.

When the ventricular walls contract,  

• the mitral valve opens and the tricuspid valve closes.
• the tricuspid valve opens and the mitral valve closes.
• the mitral and tricuspid valves close.
• the mitral and tricuspid valves open.

The loose-fitting sac around the heart is the  

• fibrous pericardium.
• visceral pericardium.
• epicardium.
• endocardium.

The skeleton of the heart consists of  

• bone within the myocardium.
• bone within the interatrial septum.
• fibrous connective tissue in the endocardium.
• fibrous connective tissue encircling the atrioventricular orifices.

Which of the following is the correct sequence of parts through which blood moves from the vena cava to the lungs?  

• Right atrium, pulmonary valve, right ventricle, tricuspid valve
• Right atrium, tricuspid valve, right ventricle, pulmonary valve
• Right ventricle, tricuspid valve, right atrium, pulmonary valve
• Right ventricle, pulmonary valve, right atrium, tricuspid valve, right ventricle

The inner lining of the heart is the  

• epicardium.
• myocardium.
• endocardium.
• pericardium.

The right atrium receives blood directly from  

• the superior vena cava and inferior vena cava only.
• the superior vena cava, inferior vena cava, and coronary sinus.
• the superior vena cava, inferior vena cava, and pulmonary veins.
• the pulmonary veins.