The exchange of gases takes place between the alveoli and which blood vessel? a.

Question

The exchange of gases takes place between the alveoli and which blood vessel? a. arterioles b. veins d. capillaries A murmur is an abnormal sound that may indicate a. bronchial b. structural heart diseases c. stroke d. Intenstinal obstruction Which layer of the heart is responsible for contraction and relaxation? a. pericadium b. epicardium c. myocardium d. endocardium Which blood vessel has valves to keep blood flow one way towards the heart? a. capillaries b. aorta c. arteries d. veins There are 5 large boxes within an R-R interval. What is the heart rate? a. 60 bpm b. 65 bpm c. 70 bpm d. 75 bpm The atrial rhythm is measured using which part of the ECG waveform? a. PR interval b. P-P interval c. R-R interval d. QT interval The inherent heart rate in the A V junction. a. 60-100 bpm b. 40-60 bpm c. 20-40 bpm d. 10-20 bpm Strong, fibrous, cords which anchor the cusps of mitral and tricuspid valves. a. chordae tendinae b. papillary muscles c. interatrial septum d. interventricular septum Which heart chamber receives oxygenated blood from the pulmonary veins. a. right atrium b. right ventricle c. left atrium d. left ventricle Blood vessels that transport oxygenated blood from the lungs to the left atrium. a. aorta b. superior vena cava c. pulmonary arteries d. pulmonary veins

Explanation / Answer

Answers

10. (D) capillaries

The exchange takes place in the million of alveoli in the lungs and the capillaries that envelope them . As shown as below , inhaled oxygen moves from the alveoli to the blood in the capillaries , and carbon dioxide moves from the blood in the capillaries to the air in the alveoli .

11. (B) structural heart disease

Abnormal heart rhythm is a problem in the electrical system of the heart . Heart murmur is a heart sound associated with a valve problem

12.(C) myocardium

13.(D) veins

Veins carry blood towards the heart veins contain one way valves which prevents blood flowing backwards

14.(A) 60bpm

5-big boxes =60 beats/min

15. (D) QT

16.(B) 40-60bpm

17. (B) papillary muscles

The chordae tending, colloquially know as the heart strings , are cord like tendons that connect the papillary muscles to the tricuspid valve and the mitral valve in the heart .

18. (C) left atrium

The right and left atria are the top chamber of the heart and receive blood into the heart . The right atrium receives deoxygenated blood from systemic circulation and left atrium receives oxygenated blood from pulmonary circulation .

19. (A) aorta

The pulmonary veins carry oxygenated blood from the lungs into the left atrium where it is returned to systemic circulation . The aorta is the largest artery in the body . It carries oxygenated blood from the left ventricle of the heart into systemic circulation .

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