A four chambered heart is not seen in:
1. | Amphibians | 2. | Crocodiles |
3. | Birds | 4. | Mammals |
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1. | Annelids and arthropods | 2. | Annelids and chordates |
3. | Chordates and arthropods | 4. | Mollusks and arthropods |
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1. | Ectoderm | 2. | Mesoderm |
3. | Endoderm | 4. | All three germ layers |
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1. Right atrio-ventricular | 2. Left atrio-ventricular |
3. Aortic semilunar | 4. Pulmonic semilunar |
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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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