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Chapter 13 The exchange of gases and nutrients between the blood and the tissues occur in blood vessels called capillaries A normal hematocrit value of 45 means that 45 if the formed elements are erythrocytes A person whose blood genotype is IAi has red blood cells with antigens bound to the outer membrane surface and anti antibodies floating in the plasma A B Action potentials in myocardial cells have a characteristic plateau phase which is caused primarily by the slow inward diffusion of Ca2 Aplastic anemia results in an abnormally low red blood cell count due to destruction of the bone marrow perhaps by chemicals in the environment or chemotherapy At rest the heart of an average human will pump liters of blood per minute 5 At rest each complete cardiac cycle lasts about 0 8 secs of which diastole lasts seconds and systole lasts seconds 0 5 0 3 Blood clotting would not occur of the plasma was deficient in fibrinogen During one cardiac cycle the major difference between the left and the right halves of the heart is that the the left side of the heart to the right Erythrocytes lack both a nucleus and mitochondria organelles In a normal ECG tracing the repolarization of the atria is hidden by the QRS wave In the ABO system of red blood cell typing which of the following genotypes would produce type O blood ii Lymph contains all of the following substances except red blood cells and platelets Normal venous return relies upon all of the following except standing upright perfectly still Pacemakers may be useful in treating a third degree AV node block Platelets release a chemical called seratonin that constricts blood vessels The buffy coat that forms when whole blood is centrifuged in a test tube is composed of white blood cells and platelets The atrioventricular AV valve is called the mitral valve separates the left atrium and left ventricle and is also called the bicuspid The endothelial cells of the blood vessel produce two important chemicals involved in hemostasis prostacyclin and von Willebrand factor The lymph eventually enters the circulation by draining into two specific veins The most important ion involved in the blood clotting sequences is Ca2 The presence of in the circulatory system would be considered abnormal Kreb s cycle enzymes The SA node is the normal pacemaker of the heart because the SA node depolarizes to its threshold potential before other pacemakers in the heart The second heart sound results from vibrations generated by the closing of the semilunar valves at the start of diastole The semilunar valves regulate the passage of blood from the ventricles into the pulmonary artery and the aorta The terms systole and diastole refer respectively to the contraction phase and relaxation phase of the ventricles Which of the following does not belong to the class of granular leukocytes lymphocyte Which of the following events is the first to occur during the process of hemostasis after a blood vessel becomes injured The endothelial lining is damaged exposing collagen proteins to the blood Which of the following is not a broad area of function within the circulatory system neurochemical release Which of the following leukocytes usually accounts for less than 1 of white blood cells present basophils Which of the following statements about arteries and veins is false Veins can collapse serving as the blood vessel with the greatest resistance to blood flow in the circulatory system Which statement about erythroblastosis fetalis hemolytic disease of the newborn is false The baby is born with an abnormally high number of red blood cells anemia Within the pulmonary circulation the pulmonary arteries carry oxygen poor blood 0 12 to 0 20 second is the duration of the in a normal heart P R interval AV node block occurs when the rate of impulse conduction through the AV node exceeds 0 20 seconds First Degree AV node block occurs when no atrial waves can pass through the AV node Third Degree development would be inhibited if the actions of granulocyte colony stimulating factor were blocked Neutrophils binds and inactivates the sodium potassium ATPase pumps of myocardial cell leading to increased intracellular calcium concentrations and stronger myocardial contractions nicotene A continual recycling of electrical waves through the myocardium is called circus rhythm A normal hematocrit for women would be 40 A normal red blood cell count is in the range of mm3 4 23 5 98 million A n is a device that is implanted into a pectoral subcutaneous pocket that delivers shocks to the heart when ventricular fibrillation is detected implantable converter defibrillator All blood vessels are lined with endothelial cells Aspirin inhibits blood clotting by directly preventing platelet plug formation Based on differences in their endothelial lining capillaries can be classified as all of the following EXCEPT true this is the answer given by the test bank Bipolar limb lead three uses the left arm and left leg Blood globulins include which of the following types A alpha globulins B beta globulins C gamma globulins D All of the choices are correct Both the intrinsic and extrinsic clotting pathways activate factors that convert prothrombin to thrombin Cardiac channels are called hyperpolarization cyclic nucleotide HCN channels because they open in response to hyperpolarization pacemaker Damage to the AV node could cause multiple P waves on an ECG Damage to tissues stimulates the activation of the blood clotting pathway extrinsic Dark red colored blood would be found in veins Decreased liver protein synthesis would cause the amount of and in the blood to be decreased albumin fibrinogen Diets promoting cardiovascular health contain no more than of total calories as fat 30 During isovolumetric ventricular contraction ventricular pressure is increasing During isovolumetric ventricular relaxation atrial pressure is less than ventricular pressure Endogenously applied or tissue plasminogen activator TPA can induce blood clot dissolution streptokinase Erythroblastosis fetalis occurs when the mother has Rh blood and the fetus has Rh blood Failure of the SA node to depolarize would result in an ECG lacking a P wave Fenestrated capillaries are found in the endocrine glands Functions of the lymphatic system include all of the following EXCEPT transport of absorbed peptides Granular leukocytes are derived from myeloblasts Having no nucleus a biconcave shape and the function of gas transport would describe a a red


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FSU PCB 3743 - Chapter 13

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