Cardiovascular System Quiz

Which of the following is NOT a component of the cardiovascular system?

• Blood vessels

• Lungs

• Heart

• Liver

How many chambers does the heart have?

• 1

• 4

• 2

• 3

What is the function of the atria in the heart?

• Pump blood to the lungs

• Pump blood to the rest of the body

• Receive blood from the systemic circulation

• Receive blood from the lungs

Which layer of the heart consists of cardiac muscle?

• Endocardium

• Myocardium

• Pericardium

• Epicardium

What is the function of intercalated discs in cardiac muscle tissue?

• Both A and B

• None of the above

• Permit action potentials to spread from one cell to another

• Hold the cells tightly together

Which cells in the heart are self-stimulating and contract without external stimulation?

• Conductive cells

• Pacemaker cells

• Autorhythmic cells

• Contractile cells

What is the role of the SA node in the heart?

• Regulates the flow rate through blood vessels

• Controls the strength of cardiac contraction

• Transmits impulses from the atria to the ventricles

• Sets the pace of contraction for the entire heart

What is the purpose of the refractory period of contractile cells in the heart?

• To prevent restimulation until contraction is almost over

• To allow for prolonged tetanus of cardiac muscle

• To permit transmission of impulses from the atria to the ventricles

• To increase the strength of cardiac contraction

What does the T wave in an ECG represent?

• Atrial repolarization

• Atrial depolarization

• Ventricular repolarization

• Ventricular depolarization

What is the major determinant of resistance in blood vessels?

• Blood pressure

• Length of the vessel

• Blood flow rate

• Vessel diameter