1. P wave | 2. PR interval |
3. QRS complex | 4. ST segment |
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To obtain a standard ECG, a patient is connected to the machine with three electrical leads including all the following except:
1. | One to right wrist | 2. | One to left wrist |
3. | One to right ankle | 4. | One to left ankle |
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1. | ventricular filling. |
2. | the atrioventricular valves to close, and then the semilunar valves to open. |
3. | the semilunar valves to close, and then the atrioventricular valves to open. |
4. | pressure to become greater in the aorta and pulmonary trunk than in the ventricles. |
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1. | I and III only | 2. | I and II only |
3. | II and IV only | 4. | II and III only |
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I: | Pulmonary circulation carries deoxygenated blood to the lungs and brings oxygenated blood back to the heart. |
II: | The systemic circulation provides nutrients, oxygen and other essential substances to the tissues and takes carbon dioxide and other harmful substances away for elimination. |
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I. | Sympathetic neural signals |
II. | Adrenal cortical hormones |
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1. | A | 2. | B |
3. | C | 4. | None |
Statement I: | A carries oxygenated blood and B carries deoxygenated blood. |
Statement II: | D and C close simultaneously during the beginning of ventricular diastole. |
Statement III: | E and F close simultaneously during the beginning of ventricular systole. |
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1. | atherosclerosis in the blood vessel that causes coronary artery disease |
2. | narrowing of lumen of coronary artery that causes congestive heart failure |
3. | vasoconstriction of the lumen of coronary artery that causes angina pectoris |
4. | the collection of platelets in blood vessel caused by viral infections like dengue that can damage the heart muscle |
A: | The number of I is increased in worm infestations and II secretes histamine and heparin in the blood. |
B: | III plays a vital role in acquired immunity. |
C: | The number of IV is significantly reduced in acute bacterial infections. |
1. | Only B | 2. | Only A and B |
3. | Only C | 4. | A, B and C |