) Blood within the pulmonary velnr B)right aru the A? left atrum function of A)
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) Blood within the pulmonary velnr B)right aru the A? left atrum function of A) veins B) arterioles eri 13) Blood ejected from the ventricles enters which of these vessels duringe A) pulmonary arteries only C pulmonary veins only 13) 8) both the sorts and plenary es D) sorts only 14) The tricuspid valve is closed A) when the ventricle is in systole B) while the ventricle is in diastole C) while the atrium is contracting D) by the movement of blood from atrium to ventricle 15) Select the correct statement about the heart valves ??) A) The AV valves are supported by chordae tendinese so that they do nt ow back up in the atria during ventricular contraction. B) Aortic and pulmonary valves control the flow of blood into the heart C) The tricuspid valve divides the left atrium from the left ventricle D) The mitral valve separates the right atrium from the right ventricle 16) When viewing a dissected heart, it is easy to visually discern the right and left ventricdes by 16) A) tracing out where the auricles connect B) locating the apex C) noticing the thickness of the ventricle walls D) finding the papillary muscles 17) Select the correct statement about the structure of the heart wall. 17) A) The myocardium is the layer of the heart that actually contracts B) Connective tissue in the heart wall aids in the conduction of the action potential. C) The heart chambers are lined by the endomysium. D) The fibrous skeleton forms the bulk of the heart 18) Which of the following are involved directly in pulmonary circulation 18) A) superior vena cava, right atrium, and left ventricle B) right ventricle, pulmonary artery, and left atrium C) right atrium, aorta, and left ventricle D) left ventricle, aorta, and inferior vena cava 19) A thrombus (blood clot) in the first branch of the arch of the aorta would affect the flow of blood 19) tothe A) right side of the head and neck and right upper arm B) left upper arm )myocardium of the heart D) left side of the head and neck ETALSE, Mark A. " the statement is true and ?. if the statement is false. 20) The mitral valve has chordae but the tricuspid valve does not 20)Explanation / Answer
11. Blood within the pulmonary veins return to the left atrium (option A).
Right atrium recieves blood from Superior and inferior venacava. Right ventricle receives blood from right atrium whereas left ventricle receives blood from left atrium, Hence, the correct answer is option A.
12. Permitting the exchange of nutrients and gases between the blood and tissue cells is the primary function of Capillaries (Option C).
Veins carries deoxygenated blood, arteries carry oxygenated blood from heart to organs while arterioles carry blood to tissues. It is the capillaries that are involved in exchange of nutrients and gases.
13. Blood ejected from the ventricles enters which of these vessels during ventricular systole? Both the aorta and pulmonary trunk (option B).
When ventricles contract, the blood from left ventricle reaches aorta and from right ventricle it enters the pulmonary arteries. Hence, the correct answer is option B
14. The tricuspid valve is closed when the ventricle is in systole (Option A).
Tricuspid valve is closed during ventricular contraction to prevent regurgitation of the blood. When the atrium is contracting the tricuspid valve is opened. AV Valves close at the end of the ventricular diastole not at systole. Option D is wrong as valve is not closed when blood moves from atrium to ventricles.
15. Select the correct statement about the heart valves. Option A. The AV valves are supported by Chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur.
16. When viewing a dissected heart, it is easy to visually discern the right and left ventricles by noticing the thickness of the ventricle walls (Option C).
Locating apex, noticing thickness or finding the papillary muscles are not helpful in discerning the right and left ventricles.
17. Option A. The myocardium is the layer of the heart that actually contracts.
Myocardium is involved in contraction of heart. Cell membrane of the heart cells are involved in conduction of action potential, but not connective tissue(hence, option B is wrong).Heart chambers are lined by endocardium (hence option C is wrong). Cardiac muscle tissue is the bulk of the heart but not fibrous skeleton (Hence, option D is wrong)
18. Option B. Right ventricle, pulmonary artery and left atrium
Pulmonary circulation consists of right side of the heart pumping deoxygenated blood to the lungs via pulmonary arteries and from the lungs pulmonary veins carry the oxygenated blood to the left side of heart. Hence, option B is correct.
Option A is wrong since, superior vencava does not involve in pulmonary circulation
Option C and D are wrong as aorta is not involved in pulmonary circulation.
19. Option A. right side of the head and neck and right upper arm
The first branch of the arch of aorta is Brachiocephalic artery that supplies right, head and neck. Hence, clot in this artery leads to deficiency in blood supply to the mentioned organs. Hence, option A is correct.
Left upper arm is supplied by Left subclavian artery which branches off from arch of artery at later stage but it is not the first branch. Hence, option B is not correct.
Option C is also wrong as myocardium of the heart is supplied by Coronary arteries which are not the first branch of arch of aorta
Option D is also wrong as the left side of the head and neck are supplied by external carotid artery which is also not the first branch of arch of aorta.
20. False.
Chordae tendineae conneccts the papillary muscles to the tricuspid as well as bicuspid valve. Hence, the given statement is false.
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