Exam 7: The Peripheral Nervous System: Efferent Division

The T wave represents the depolarization of the ventricles.

The EDV of the heart averages about 65 mL.

Which of these statements describes why the heart valves open and close?

Which of the following actions produces the second heart sound?

Which of the following normally carries out the fastest rate of autorhythmicity?

Match the pressure relationships, labelled e., with the times in question. (Options may be used more than once or not at all.)a. through a.aortic pressure > ventricular pressure > atrial pressure b.ventricular pressure > aortic pressure > atrial pressure c.aortic pressure > atrial pressure > ventricular pressure d.ventricular pressure > atrial pressure > aortic pressure e.atrial pressure > ventricular pressure > aortic pressure -during isovolumetric ventricular relaxation

Which of the following is the normal pacemaker of the heart?

The aortic valve prevents backflow of blood from the aorta into the left ventricle during ventricular diastole.

Match the cardiovascular features, labelled a. through d., with their correct characteristic. a.angina pectoris b.embolus c.atherosclerosis d.thrombus -referred cardiac pain

The ____________________ extracts cholesterol from the blood and converts it into ____________________, which are secreted into the bile.

The plateau phase of the action potential in a contractile cardiac muscle cell occurs as a result of activation of slow Ca²⁺ channels.

Match the factor involved in the initiation and spread of cardiac excitation, labelled d. with the description. (Options may be used more than once or not at all.)a. through a.SA node b.AV node c.bundle of His and Purkinje system d.gap junction -has the fastest rate of pacemaker activity

Match the factor involved in the initiation and spread of cardiac excitation, labelled d. with the description. (Options may be used more than once or not at all.)a. through a.SA node b.AV node c.bundle of His and Purkinje system d.gap junction -delays conduction of the impulse

Describe the primary factors that influence cardiac output.

The functional syncytia of the myocardium are offered by the intercalated discs.

Which of the following situations will NOT increase stroke volume?

What rhythm characterizes atrial flutter as impulses pass from the AV node to the ventricles?

What is the term for the period lasting from closure of the AV valve to opening of the aortic valve?

Match the EKG features, labelled f., with their correct characteristic.a. through a.P wave b.QRS complex c.T wave d.PR interval e.TP interval f.ST segment -ventricular repolarization

Arteries carry blood toward the ventricles.