front 1 Blood in the heart chambers provides some nutrients to the heart muscle cells. | back 1 t |
front 2 The myocardium receives its blood supply from the coronary arteries. | back 2 t |
front 3 Anastomoses among coronary arterial branches provide collateral routes for blood delivery to the heart muscle. | back 3 t |
front 4 The left side of the heart pumps the same volume of blood as the right. | back 4 t |
front 5 Arterial blood supply to heart muscle is continuous whether the heart is in systole or diastole. | back 5 F |
front 6 The papillary muscles contract after the other ventricular muscles so that they can take up the slack on the chordae tendineae before the full force of ventricular contractions sends blood against the AV valve flaps. | back 6 f |
front 7 Auricles slightly increase blood volume in the ventricles. | back 7 f |
front 8 Cardiac muscle has more mitochondria and depends less on a continual supply of oxygen than does skeletal muscle. | back 8 f |
front 9 Congestive heart failure means that the pumping efficiency of the heart is depressed so that there is inadequate delivery of blood to body tissues. | back 9 t |
front 10 Chronic release of excess thyroxine can cause a sustained increase in heart rate and a weakened heart. | back 10 t |
front 11 The "lub" sounds of the heart are valuable in diagnosis because they provide information about the function of the heart's pulmonary and aortic valves. | back 11 f |
front 12 Autonomic regulation of heart rate is via two reflex centers found in the pons. | back 12 f |
front 13 An ECG provides direct information about valve function. | back 13 f |
front 14 As pressure in the aorta rises due to atherosclerosis, more ventricular pressure is required to open the aortic valve. | back 14 t |
front 15 Proxysmal atrial tachycardia is characterized by bursts of atrial contractions with little pause between them. | back 15 t |
front 16 Tissues damaged by myocardial infarction are replaced by connective tissue. | back 16 t |
front 17 Osmotic pressure is created by the presence in a fluid of small diffusible molecules that easily move through the capillary membrane. | back 17 f |
front 18 The outermost layer of a blood vessel is the tunica intima. | back 18 f |
front 19 Vasodilation is a widening of the lumen due to smooth muscle contraction. | back 19 f |
front 20 The thick-walled arteries close to the heart are called muscular arteries. | back 20 f |
front 21 A precapillary sphincter is a cuff of smooth muscle that regulates the flow of blood into the capillaries. | back 21 t |
front 22 The pancreas is an example of an organ with arteries that do not anastomose. | back 22 f |
front 23 Arteries supplying the same territory are often merged with one another, forming arterial anastomoses. | back 23 t |
front 24 An increase in blood viscosity will cause an increase in peripheral resistance. | back 24 t |
front 25 Hypotension is generally considered systolic blood pressure that is below 100 mm Hg. | back 25 t |
front 26 The carotid sinus reflex protects the blood supply to the brain, whereas the aortic reflex is more concerned with maintaining adequate blood pressure in the systemic circuit as a whole. | back 26 t |
front 27 The adjustment of blood flow to each tissue in proportion to its requirements at any point in time is termed autoregulation. | back 27 t |
front 28 Every minute, about 1.5 ml of fluid leaks out of the capillaries. | back 28 t |
front 29 Whereas diffusion is more important for solute exchange between plasma and interstitial fluid, bulk flow is more important for regulation of the relative volumes of blood and interstitial fluid. | back 29 t |
front 30 Arterial pressure in the pulmonary circulation is much higher than in the systemic circulation because of its proximity to the heart. | back 30 f |
front 31 The cerebral arterial circle (circle of Willis) is an arterial anastomosis. | back 31 t |
front 32 The pulmonary circulation does not directly serve the metabolic needs of body tissues. | back 32 t |
front 33 An obstruction in the superior vena cava would decrease the flow of blood from the head and neck to the heart. | back 33 t |
front 34 The azygos vein originates in the abdomen. | back 34 t |
front 35 Fetal hemoglobin has a higher affinity for oxygen than does adult hemoglobin. | back 35 t |
front 36 The primary source of RBCs in the adult human being is the bone marrow in the shafts of the long bones. | back 36 f |
front 37 Hemorrhagic anemias result from blood loss. | back 37 t |
front 38 White blood cells are produced through the action of colony-stimulating factors. | back 38 t |
front 39 Hemoglobin is made up of the protein heme and the red pigment globin. | back 39 f |
front 40 Each hemoglobin molecule can transport two molecules of oxygen. | back 40 f |
front 41 Diapedesis is the process by which red blood cells move into tissue spaces from the interior of blood capillaries. | back 41 f |
front 42 Positive chemotaxis is a feedback system that signals leukocyte migration into damaged areas. | back 42 t |
front 43 Basophils increase in number when parasitic invasion occurs. | back 43 f |
front 44 Leukopenia is an abnormally low number of leukocytes. | back 44 t |
front 45 Leukocytes move through the circulatory system by amoeboid motion. | back 45 f |
front 46 Granulocytes called neutrophils are phagocytic and are the most numerous of all white blood cell types. | back 46 t |
front 47 All lymphocytes are leukocytes, but not all leukocytes are lymphocytes. | back 47 t |
front 48 Myelocytic leukemia involves a cancerous condition of lymphocytes. | back 48 f |
front 49 Leukemia refers to cancerous conditions involving white blood cells. | back 49 t |
front 50 The normal RBC "graveyard" is the liver. | back 50 f |
front 51 Myeloid stem cells give rise to all leukocytes. | back 51 f |
front 52 The immediate response to blood vessel injury is clotting. | back 52 f |
front 53 The process of fibrinolysis disposes of bacteria when healing has occurred. | back 53 f |
front 54 Clotting factor activation turns clotting factors into enzymes. | back 54 t |
front 55 A person with type B blood could receive blood from a person with either type B or type O blood. | back 55 t |