3740866
Description
Flashcards by tiwariashley, updated more than 1 year ago
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Created by tiwariashley
over 8 years ago
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| Question | Answer |
| blood flows from the lungs to the left atrium via the | pulmonary vein |
| blood flows from left atrium to the left ventricle via the | mitral valve |
| blood flows from the left ventricle to the aorta via the | aortic valve |
| blood flows from the aorta to the | systemic arteries and tissues |
| blood flows from the tissues to the | systemic veins and vena cava |
| blood flows from the vena cava to the | right atrium |
| blood flows from the right atrium to the _______ ventricle through the ______ valve | right ventricle through tricuspid valve |
| blood flows from right ventricle to the | pulmonary artery |
| blood flows from the pulmonary artery to the _________ for oxygenation | lungs |
| arteriography of a patient's left renal artery shows a narrowing of the radius of the artery by 50%. What is the expected change in blood flow through the stenotic artery | decrease to 1/16 |
| When a person moves from supine position to a standing position what compensatory changes occurs? | increased contractility |
| At which site is the systolic blood pressure the highest | renal artery |
| A person's ECG has no P wave but has normal QRS complex and a normal T wave. Therefore his pacemaker is located in the | AV node |
| If the ejection fraction increases there will be a decrease in | end-systolic volume |
| An electrocardiogram on a person shows ventricular extrasystole. The extrasystole beat would produce | decreased pulse pressure because stroke volume is decreased |
| An electrocardiogram on a person shows ventricular extrasystole. The next normal ventricular contraction that occurs after the extrasystole would produce | increased pulse press because the contractility of the ventricle is increased |
| An increase in contractility is demonstrated on a Frank-Starling diagram by | increased cardiac output for a given end diastolic volume |
| The tendency for blood flow to be turbulent is increased by | partial occlusion of a blood vessel |
| a patient experience orthostatic hypotension after a sympathectomy. The explanation for this occurrence is | a suppressed response of the baroreceptor mechanism |
| The ventricles are completely depolarized during which isoelectric portion of the electrocardiogram | ST segment |
| When is pulmonary blood flow greater than aortic blood flow | left to right ventricular shunt |
| a person's ECG shows two P waves preceding each QRS complex. The interpret action of this pattern is | decreased conduction through the AV node |
| an acute decrease in arterial blood pressure elicits what compensatory change | decreased firing rate of the carotid sinus nerve |
| The tendency for edema to occur will be increased by | increased venous pressure |
| Inspiration splits the second heart sound | the aortic valve closes before the pulmonic valve |
| During exercise total peripheral resistance TPR decreases because of the effect of | local metabolites on skeletal muscle arterioles |
| an increase in arteriolar resistance without a change in any other component of the cardiovascular system will produce | an increase in arterial pressure |
| The following measurements were obtained in a male patient HR: 70bpm Pulmonary vein O2: .24 O2/ml Pulmonary artery O2: .16 O2/ml Whole body O2 consumption: 500 ml/min What is the patient's cardiac output | 6.25L min |
| An inward Na+ current is the result of an | upstroke of the action potential in Purkinje Fibers |
| The greatest pressure decrease in the circulation occurs across the arterioles because | they have the greatest resistance |
| Pulse pressure is | determined by stroke volume |
| In the SA node phase 4 depolarization/ pacemaker potential is attributable to | an increase in Na+ conductance |
| Which receptor mediates constriction of arteriolar smooth muscle | A1 receptors |
| during which phase of the cardiac cycle is aortic pressure highest | reduced ventricular ejection |
| myocardial contractility is best correlated with the intracellular concentration of | Ca2+ |
| What is an example of the effect of histamine | vasodilation of the arterioles |
| Carbon dioxide regulates blood flow to what organ | brain |
| Cardiac output of the right side of the heart is what percentage of the cardiac output of the left side of the heart | 100% |
| The physiologic function of the relatively slow conduction through the AV node is to allow sufficient time for | filling of the ventricles |
| Blow flow to which organ is controlled primarily by the sympathetic nervous system rather than by local metabolites | skin |
| What parameter is decreased during moderate exercise | TPR total peripheral resistance |
| This receptor is blocked when propranolol is administered to reduce cardiac output | B1 receptor |
| during which phase of the cardiac cycle is ventricular volume lowest | isovolumetric ventricular relaxation |
| what causes an increase in myocardial O2 consumption | increased size of heart |
| What substance crosses capillary walls primarily through water-filled clefts between the endothelial cells | Carbon monoxide |
| A 24 yo woman presents to the ER department with severe diarrhea. When she is lying supine (lying down) her blood pressure is 90/60 mm Hg ( decreased) and her heart rate further increases to 120bpm. What accounts for further increase in heart rate upon standing | decreased venous return |
| A 60 yo businessman is evaluated by his physician who determines that is bp is significantly elevated at 185/130 mm Hg. Lab tests reveal an increase in plasma renin activity , plasma aldosterone level, and left renal vein renin level. His right renal vein level is decreased. What is the cause for his hypertension | left renal artery stenosis |
| Propranolol has what effect on the heart | decreases heat rate |
| Which receptor mediates slowing of the heart | muscarinic receptors |
| A change in _____ has a negative inotropic effect on the heart | ACh |
| The low-resistance pathways between myocardial cells that allow for the pored of action potentials are the | gap junctions |
| which agent is released or secreted after a hemorrhage and causes an increase in renal Na+ reabsorption | Aldosterone |
| During which phase of the cardiac cycle does the mitral valve open | isovolumetric ventricular relaxation |
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