Choose the Correct Options for Coronary Sulcus in Thorax Flashcards

1) Grooves on the external surface of the heart that divide the right and left ventricles include the A) lateral sulcus. B) anterior interventricular sulcus. C) coronary fissure. D) posterior interventricular sulcus. E) B and D.

2) Which of the following is true of the coronary arteries? A) They originate at the base of the aorta and are the first branch off this vessel. B) They branch off the pulmonary veins. C) They open and close in pulsation with the contraction and relaxation of the heart ventricles. D) Together they supply part of the heart muscle with oxygen. E) None of the above are true.

3) The left atrium receives blood from the A) pulmonary trunk. B) pulmonary veins. C) aorta. D) mitral valve. E) coronary arteries.

4) Analysis of an ECG can reveal A) damage to the coronary vessels. B) the condition of the conducting system. C) the sequence of the valves opening and closing. D) the volume of blood passing through the heart. E) none of the above.

5) During one cardiac cycle the heart spends most of its time in A) fibrillation. B) contraction. C) diastole. D) systole. E) none of the above states.

6) Cardiac muscle differs from other muscle tissue in A) having fibers connected to one another at intercalated discs. B) having larger sized fibers than other striated muscles. C) having fewer mitochondria. D) having striations. E) no ways; it is not unusual.

7) The phase of the cardiac cycle during which each chamber contracts and pushes blood into an adjacent chamber is A) relaxation. B) systole. C) diastole. D) ejection. E) none of the above.

8) The tough structure that surrounds the heart and helps prevent overfilling is the A) epicardium. B) pericardial sac. C) pleural cavity. D) aorta. E) mediastinum.

9) The contraction of any one cardiac muscle fiber A) will trigger an all- or- none response in all other cardiac fibers. B) will stimulate the electrical conduction system of the heart. C) will cause the rate of heart muscle contraction to increase. D) will cause the contraction of several others. E) will do none of the above.

10) The connective tissues of the heart A) consist only of many dense collagen fibers. B) do not join the muscle fibers to the fibrous skeleton of the heart. C) provide a strong fibrous cross- linkage system wrapping adjacent muscle cells together. D) have the attributes of A and C. E) have none of the above attributes.

11) Which of the following conditions would be caused if the amount of blood entering the ascending aorta with each contraction of the heart were increased? A) The atrioventricular valves would not close. B) The amount of blood sent to the lungs for oxygenation would decrease. C) Stimulation by the sympathetic nervous system would accompany this change. D) The amount of blood entering the right atrium of the heart would have been increased. E) The heartbeat would be speeded up by the parasympathetic nervous system.

12) Papillary muscles receive a signal to contract from (the) A) Purkinje fibers. B) AV node. C) bundle branches. D) moderator band. E) none of the above.

13) Nodal activity of the heart may be influenced or modified by A) hormones secreted by the lungs. B) the sympathetic component of the autonomic nervous system. C) the parasympathetic component of the autonomic nervous system. D) either the SA node or the AV node, but no other system. E) both B and C.

14) The moderator band is located in the A) right ventricle. B) left ventricle. C) right atrium. D) interventricular sulcus. E) left atrium.

15) If a small blood clot passes through the heart and heart vessels, where is it most likely to cause damage if it becomes immobilized? A) the aorta B) the left ventricle C) the right atrial chamber D) the left coronary artery E) Severe damage could occur if a small blood clot became immobilized at any of these positions.