PRE-TEST KR2

Which structure delivers oxygenated blood from the lungs to the left atrium?

• Pulmonary artery

• Aorta

• Pulmonary veins

• Superior vena cava

• Coronary sinus

The sinoatrial (SA) node is located in the:

• Right atrium near the coronary sinus

• Interventricular septum

• Wall of the left atrium

• Right atrium near the superior vena cava

• Left ventricle wall

Which of the following best describes stroke volume?

• Volume of blood in ventricles after systole

• Volume ejected from ventricles per beat

• Volume ejected per minute

• Volume returning to the heart per minute

• Volume in left atrium during diastole

A 58-year-old man undergoing phase II cardiac rehab asks what determines cardiac output. The best response is:

• Heart rate × stroke volume

• Heart rate × diastolic pressure

• Systolic pressure × ejection fraction

• Stroke volume ÷ total peripheral resistance

• Heart rate ÷ systolic volume

During aerobic exercise, which of the following increases?

• Diastolic pressure

• Total peripheral resistance

• Venous return

• Parasympathetic tone

• Vagal output

Baroreceptors that regulate blood pressure are found in the:

• Coronary arteries and pulmonary veins

• Aortic arch and carotid sinus

• Inferior vena cava and right atrium

• Left ventricle and aortic valve

• Pulmonary artery and pulmonary vein

A 65-year-old woman with stable angina begins cardiac rehab. Which physiological adaptation can be expected?

• Decreased resting heart rate

• Increased LDL levels

• Decreased stroke volume

• Increased myocardial oxygen demand at rest

• Decreased ejection fraction

Which heart valve is between the left atrium and left ventricle?

• Tricuspid

• Pulmonary

• Aortic

• Mitral

• Thebesian

Which layer of the heart contains contractile cardiomyocytes?

• Endocardium

• Pericardium

• Epicardium

• Myocardium

• Fibrous skeleton

What physiological change contributes most to increased cardiac output during exercise?

• Increased blood viscosity

• Decreased heart rate

• Increased stroke volume and HR

• Decreased venous return

• Decreased preload