Physiology w/Lab Quiz 8 05/04/2016 Which of these changes will result in increased blood pressure? decreased blood viscosity decrease cardiac output increased vessel radius increased blood volume [AdsenseImage] Which of the following does NOT drive venous return? smooth muscle in the walls of veins skeletal muscle pump venous valves low compliance If the chemoreceptors detect a decrease in blood oxygen concentration, they will trigger __________. vasoconstriction and decreased cardiac output vasodilation and increased cardiac output vasoconstriction and increased cardiac output vasodilation and decreased cardiac output The leakiest capillaries, which allow large substances such as cells to cross the capillary walls are called __________. continuous capillaries fenestrated capillaries metarterioles sinusoidal capillaries Colloid osmotic pressure (COP) is an osmotic pressure gradient equal to __________. Interstitial OP – Capillary OP Interstitial OP + Capillary OP Hydrostatic pressure + Net filtration pressure Capillary OP – interstitial OP [AdsenseImage] Blood from the systemic circuit returns to the heart via the __________. vena cavae pulmonary veins pulmonary arteries cardiac veins Unlike skeletal muscle action potentials, cardiac muscle action potentials __________. begin with a rapid depolarization phase involve calcium voltage-gated channels do not involve repolarization have a short refractory period The electrical impulse is __________ as it passes through the AV node, because the atria need to contract __________ ventricles. accelerated; before delayed; after accelerated; after delayed; before Ventricular systole begins during the __________ phase of the cardiac cycle. ventricular ejection isovolumetric contraction ventricular filling isovolumetric relaxation [AdsenseImage] Which of the following happens immediately after the P wave? The ventricles contract. The ventricles relax. The atria contract. The atria relax. How will the cardiac output change if you double the heart rate but reduce the stroke volume by one-half? It will not change. It will decrease. It will increase. The answer cannot be determined by the information given. The T wave of an ECG corresponds to __________. atrial repolarization atrial depolarization ventricular depolarization ventricular repolarization According to the Frank-Starling law, a bigger preload will result in __________. a stronger contraction decreased afterload a weaker contraction increased afterload Cells can respond to ________ hormone(s) at the same time. only one a few several hundred an unlimited number of [AdsenseImage] What is the primary effect of antidiuretic hormone (ADH, or vasopressin)? increases urine production by the kidneys water retention by the kidneys sodium retention by the kidneys blood glucose regulation When growth hormone levels are low, which hormone stimulates its release? prolactin-releasing hormone (PRH) somatostatin somatotropin growth hormone-releasing hormone (GHRH) Edna complains of weight gain, cold intolerance, and low blood pressure. What disorder do her symptoms match? hyperthyroidism exophthalmos hypothyroidism Graves’ disease What is NOT an effect of parathyroid hormone (PTH)? increased release of calcium ions from bone increased absorption of calcium ions by the small intestine increased reabsorption of calcium ions from fluid in the kidneys increased osteoblast activity [AdsenseImage] What is NOT a primary effect of aldosterone? maintaining acid-base balance regulating extracellular fluid volume maintaining blood glucose maintaining blood pressure Atrial natriuretic peptide (ANP) promotes: decreased urination. water retention. increased blood pressure. vasodilation. aa Residence Inn by Marriott BransonGarfield On The Oil Crisis
