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- Visit this site (http://openstaxcollege.org/l/heartvalve) to observe an echocardiogram of actual heart valves opening and closing. Although much of the heart has been removed from this gif loop so the chordae tendineae are not visible, why is their presence more critical for the atrioventricular valves (tricuspid and mitral) than the semilunar (aortic and pulmonary) valves?sinus is the largest located laterally and slightly inferior to nasal cavity O a. Maxillary sinus Ob. Ethmoidal sinus Oc. Sphenoidal sinus Od. Frontal sinus Oe. All of the above4. The aortic semilunar valve has? pocketlike flaps of tissue. 5. The ? are fibrous structures that prevent the cuspid valves from prolapsing (bending backward). 6. One-way flow of blood from the right ventricle is ensured by the presence of the_ ? valve. umal mou allow hlond to onter the
- OBoth atria and ventricles contract at the same time and all valves are open 1 Which of the following best describes the flow of oxygenated blood in the heart? O Pulmonary veins - Left atrium - Right ventricle - pulmonary arteries O Pulmonary veins - Left atrium - Left ventricle - pulmonary arteries O Pulmonary veins - Left atrium - Left ventricle - Aorta O Vena cava - Right atrium - Right ventricle - pulmonary arteries Which of the following is a normal range found in the human body? 1The heart's pacemaker is the O a. atrioventricular node O b. bicuspid node O c. sinoatrial node O d. Purkinje node atory Quiz #1 Jump to... uest.ca/mod/oquiz/summary.phplattempt=2696341&cmid-2133217In which of the following does a blood vessel burst, sending bloodinto the surrounding tissues, such as the brain.a. angina pectorisb. a heart attackc. atherosclerosisd. a stroke
- Which properties of the electrocardiogram are not true? OA. The P-Wave corresponds to excitation of the Atrium. OB. The QRS complex corresponds the depolarization of the ventricle. OC. The T wave corresponds to the repolarization of the ventricle. OD. The electrocardiogram gives a measure of the timing of events in the heart. O E. All are trueA membrane called the _____ covers the heart. A membrane superficial to this membrane is the _____. A parietal pericardium; visceral pericardium B visceral pericardium; parietal pericardium C fibrous pericardium; endocardium D endocardium; parietal peritoneumWhich of the following is the correct circulatory sequence forblood to pass through part of the heart?a. R. atrium → right AV valve → R. ventricle → pulmonarysemilunar valveb. R. atrium → left AV valve → R. ventricle → pulmonarysemilunar valvec. L. atrium → right AV valve → L. ventricle → aorticsemilunar valved. L. atrium → left AV valve → L. ventricle → pulmonarysemilunar valve
- The sinoatrial node is also called the A. PacemakerB. Action potentialC. Resting membrane potentLeft atrium Aorta Left ventricle Арех Right atrium Pulmonary trunk Right ventricle Left interventricular coronary artery Right coronary artery Circumflex artery been the thePart A- Why do arteries have many more elastic fibers than veins? They have less pressure during ventricular systole O They need to be round in histological cross-section O They need to be able to withstand the pressure that arises as blood is pumped from the heart O All of the above O None of the above