Quiz 10

Which part of the intrinsic conduction system delays the impulse briefly before it moves on to the ventricles A. Purkinje fibers B. bundle branches C. AV bundle (bundle of His) D. SA node E. AV node

AV node

Increased pressure in the ventricles would close what valve(s)? A. AV valves only B. semilunar valves only C. both semilunar and AV valves

AV valves only

Which part of the conduction system initiates the depolarizing impulse, which spreads throughout the heart? A. AV node B. Purkinje fibers C. AV bundle (bundle of His) D. SA node

SA node

Identify the correct match. A. Systole = relaxation of heart chambers B. Diastole = contraction of heart chambers C. Cardiac output = the amount of blood ejected by the right ventricle in one minute D. Stroke volume = the amount of blood ejected by an atrium in a single beat E. SA node = tissue mass embedded in the posterior wall of the right atrium

SA node= tissue mass embedded in the posterior wall of the right atrium

What would happen if the plasma protein, albumin, could easily cross capillary walls? A. Albumin would attack proteins on the surface of blood cells. B. Albumin would enter blood capillaries and form large, insoluble blood clots. C. Albumin would bind small ions, compromising their function in vital cellular activities. D. A drop in osmotic pressure of plasma would cause blood volume to decrease.

a drop in osmotic pressure of plasma would cause blood volume to decrease

The release of norepinephrine at synapses in the myocardium results in ________. A. a decrease in cardiac output B. inhibition of cardiac muscle cell metabolism C. an increase in stroke volume D. a decreased heart rate E. a decrease in the force of cardiac contractions

an increase in stroke volume

Systemic circulation is to the body as the _______________ circulation is to the heart. A. deoxygenated B. oxygenated C. pulmonary D. coronary

coronary

What does the ECG wave tracing represent? A. electrical activity in the heart B. contraction of the heart

electrical activity in the heart

Which of the following begins with the activation of plasminogen? A. thrombosis B. agglutination C. intrinsic pathway D. extrinsic pathway E. fibrinolysis

fibrinolysis

What causes the aortic semilunar valve to close? A. greater pressure in the aorta than in the left ventricle B. higher ventricular pressure than aortic pressure C. equal ventricular and aortic pressures

greater pressure in the aorta than in the left ventricle

Which of the following could cause the hematocrit to decrease significantly below a normal value? A. Dehydration B. High altitude C. Internal bleeding D. Minor infection

internal bleeding

Part complete Put the phases of the cardiac cycle in the correct order, starting after ventricular filling. A. ventricular ejection, ventricular relaxation, isovolumetric contraction B. isovolumetric relaxation, ventricular ejection, isovolumetric contraction C. isovolumetric contraction, ventricular ejection, isovolumetric relaxation D. ventricular ejection, isovolumetric contraction, isovolumetric relaxation

isovolumetric contraction, ventricular ejection, isovolumetric relaxation

Which of the following is correct about the filling of the ventricles? A. Most blood flows passively into the ventricles through open AV valves. B. The majority of ventricular filling is caused by contraction of the atria.

most blood flows passively into the ventricles through open AV valves

Which of the following pairs are mismatched? A. neutrophils: antibody production B. basophils: release histamine C. eosinophils: allergic reaction D. monocytes: phagocytosis

neutrophils: antibody production

Contraction of the atria results from which wave of depolarization on the ECG tracing? A. P wave B. QRS complex C. T wave

p wave

The cardioinhibitory center controls activities of the ________ motor neurons. A. preganglionic B.ganglionic C.parasympathetic D. postganglionic E. sympathetic

parasympathetic

Describe the pressures in the atria and ventricles that would cause the opening of the AV valves. A. Pressures in the atria and ventricles would be equal. B. Pressure in the ventricles would be greater than in the atria. C. Pressure in the atria would be greater than the pressure in the ventricles.

pressure in the atria would be greater than the pressure in the ventricles

The function of the cardiac skeleton is to A. supply blood to the muscle tissue of the heart. B. stabilize the position of the heart valves. C. convey blood away from the heart. D. provide for the movement of ions and small molecules. E. reduce friction between the opposing surfaces of the pericardial sac.

stabilize the position of the heart valves

Which statement is correct regarding the heart wall? A. The myocardium is comprised of a simple squamous epithelium and an underlying layer of areolar tissue. B. The endocardium is the visceral pericardium. C. The endothelium consists of cardiac muscle tissue, blood vessels, and nerves. D. The epicardium is a serous membrane that consists of an exposed epithelium and an underlying layer of areolar tissue. E. The cardiac muscle tissue forms bands that wrap around the ventricles and spiral into the wall of the atria.

the epicardium is a serous membrane that consists of an exposed epithelium and an underlying layer of areolar tissue

The extrinsic pathway of coagulation is activated by A. the release of tissue factor by damaged endothelium. B. the release of heparin from the liver. C. the activation of proenzymes exposed to collagen. D. the conversion of prothrombin to thrombin. E. the sticking of platelets to damaged tissue.

the release of tissue factor by damaged endothelium

Which of the following statements is true regarding the blood of an individual with Type AB? A. People with Type AB blood can only receive Type AB blood. B. Type AB blood does not contain A or B antigens. C. Type AB blood does not contain anti-A or anti-B antibodies. D. Type AB blood is known as the universal donor.

type AB blood does not contain anti-A or anti-B antibodies

The semilunar valves prevent backflow into the A. atria. B. venae cavae. C. pulmonary trunk. D. aorta. E. ventricles.

ventricles

What does the QRS complex represent in the ECG wave tracing? A. ventricular repolarization B. atrial repolarization C. ventricular depolarization D. atrial depolarization

ventricular depolarization

Isovolumetric relaxation and ventricular filling (two phases of the cardiac cycle) take place during __________. A. ventricular diastole B. ventricular systole

ventricular diastole