BIO 203 Final Exam Study Guide Correct Questions & Answers(RATED A)

The primary action of a drug that dilates the veins and venules would be able to - ANSWER reduce preload According to Starling's Law of the Heart, the force of contraction of the myocardium increases with increased - ANSWER preload A coronary artery embolism is often cleared by injecting - ANSWER plasminogen activator Calcium channel blockers, beta-blockers, angiotensin-converting enzyme inhibitors and angiotensin receptor blockers are all used to treat - ANSWER hypertension One of the treatments for angina pectoris is aimed at - ANSWER reducing the oxygen demand of the heart A 68 year old patient has an embolism in her left anterior descending coronary artery . One of the consequences of this event is likely to be - ANSWER myocardial ischemia Causes of hypovolemic shock - ANSWER severe burns, hemorrhage, vomiting, diarrhea We would observe the lowest cardiac output - ANSWER during ventricular fibrillation A 40 year old patient presents with a pale, cold, sweaty skin, reduced blood pressure, rapid pulse and reduced urine volume. What is a likely possibility? - ANSWER hypovolemic shock Compared with a couch potato, a marathon runner at rest has a higher - ANSWER stroke volume One place where we find receptors for the baroreceptor reflex is in the walls of the - ANSWER carotid arteries A 30 year old patient has developed serious generalized edema. Which of the following could be considered a possible cause? - ANSWER liver disease A 45 year old patient has hypertension. Two types of drugs are typically prescribed for him. One type lowers the TPR. The other increases - ANSWER urine volume A patient suddenly stands up after lying down for a while. What is the immediate effect on her cardiovascular system? - ANSWER blood volume in the leg veins increases A 68 year old patient in intensive care suddenly goes into ventricular fibrillation. This emergency situation would probably be dealt with by administration of - ANSWER direct current shock to the chest The electrocardiogram following a myocardial infarction could show - ANSWER S-T segment may be elevated, T wave is inverted, or Q wave is increased in size Pacemaker cells - ANSWER have muscarinic receptors for acetylcholine, have beta-adrenergic receptors, and if the SA node fails, the AV node may take over as the heart's pacemaker The action potential of cardiac muscle cells has a "plateau", This corresponds to the time when ---- ions are entering the cell - ANSWER calcium A heart rate of below 50 beats per minute at rest is the definition of - ANSWER sinus bradycardia A sharp blow to the chest from a baseball during the vulnerable period (T wave) of the ECG can trigger an episode of ventricular fibrillation called - ANSWER commotio cordis Afterload is elevated by - ANSWER stenosis of the aortic valve As the ventricle contract, the papillary muscles pull on the - ANSWER chordae tendineae An obstruction in the popliteal artery will impair blood flow to the - ANSWER lower leg In a person as rest, the heart pumps about 5.6 liters of blood per minute into the aorta, but the whole cardiovascular system contains only about 5 liters. Explain. - ANSWER the 5.6 liters of blood pumped into the aorta returns to the heart The right ventricular myocardium is thinner that the left because it - ANSWER pumps into a low resistance circuit In an experiment, the blood flow through the right renal artery is 750 ml/min. After injection of drug C, the flow drops to 450 ml/min. Therefore, drug C was most likely to have caused - ANSWER vasoconstriction of the renal arterioles We normally find oxygenated blood in - ANSWER pulmonary veins Which of the following statements is wrong? -veins hold more blood at a lower pressure than arteries -blood According to Starling's Law of the Heart, the force of contraction of the myocardium increases with increased