B. to prevent backflow C. to stimulate the heart D. to give support to the heart
ID: 3506936 • Letter: B
Question
B. to prevent backflow C. to stimulate the heart D. to give support to the heart 36. What structures anchor the atrioventricular valves to the papillary muscles of the ventricle w A. interatrial septum B. auricles C. chordae tendinae D. coronary sinus 37. What is the name of the extensions of the ventricular myocardium that prevent the valves fro opening into the atria? A. chordae tendinae B. interventricular septum C. interatrial septum D. papillary muscles 38. What vessels carry oxygen poor blood from the right ventricle to the lungs for gas exchange A. pulmonary arteries B. pulmonary veins C. aorta and coronary arteries D. superior and inferior vena cavas 39. The left atrium A. receives oxygen rich blood from lungs B. pumps oxygen rich blood toward the body tissues.Explanation / Answer
36. (c) Chordae tendinae
These structures contract during ventricular systole/ contraction to avoid collapsing or inversion of the atrio ventricular valves.
Interatrial septum is the structure that separates left aorta from right aorta.
Auricle is a sort of a covering or cap like structure that is present on left atria.
Coronary sinus is a group of veins that combine together to form a larger vein. It sends deoxydenated blood to right atrium.
37. (d) Papillary muscles
These are conical extensions of myocardium
Interventricular septum is the structure separating left and right ventricles from each other.
38. (a) Pulmonary arteries carry deoxygenated blood from right ventricle to lungs for oxygenation.
Pulmonary veins carry oxygenated blood from lungs to left atrium of the heart.
Aorta supplies oxygenated blood to the body parts.
Coronary arteries carry blood towards the heart.
39. Left atrium receives oxygen rich blood from the pulmonary veins.
Superior vena cava supplies deoxygenated blood from upper parts of body to right atrium.
Inferior vena cava supplies deoxygenated blood from lower parts of body to right atrium.
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