Bio 255 exam 4 practice Questions and Answers

Bio 255 exam 4 practice Questions and Answers The circulatory system can help regulate temperature in the body. If the body is overheated, its temperature can be lowered by: increasing blood flow to the capillaries near the skin surface One of the main functions of blood is transport. Which of the following things does blood NOT transport throughout the body? interstitial fluid Which of the following is true about blood plasma? It is about 90% water. Which part of the hematocrit (formed elements of blood) is the largest percentage by volume? erythrocytes Mature red blood cells lack a nucleus. True Which of the following is the precursor to B cells and T cells? lymphoblasts White blood cells that can be identified by the dark bluish-purple granules in their cytoplasm are called: Basophils A neutrophil WBC count of 75% would be [ Select ] and would support a diagnosis of a abnormally high , bacterial infection Which formed element of blood is really just a fragment of a megakaryocyte? Platelet Compared to skeletal muscle, cardiac muscle has gap junctions, allowing the cells to all contract together. Blood is carried to capillaries of the myocardium by way of Coronary Sinuses Which anatomical component of the intrinsic autorhythmicity system of the heart functions to assure that the ventricles contract after the atria? atrioventricular node The bicuspid valve prevents backflow from the Left ventricle & Left atrium In fetal circulation, which structure allows oxygenated blood to pass from the right atrium to the left atrium? foramen ovale Which tunic of an artery is able to affect blood pressure through vasoconstriction and vasodilation? tunica media A thrombus (an abnormal blood clot) in the third major branch off the aortic arch would affect the flow of blood to the left arm Which type of capillary has the largest holes in its endothelium, as well as an incomplete basement membrane, allowing large molecules and cells to pass in and out of the circulatory system? sinusoids Varicose veins are caused by: incomplete closure of the valves Lymph most directly is derived from interstitial fluid Lymph collecting from the lower extremities would first pool in the ________ before moving superiorly to the thorax. cisterna chyli Select the correct statement about lymphocytes. B cells produce plasma cells, which secrete antibodies into the blood. Mucosa-associated lymphatic tissue (MALT) is found in membranes of all of the following EXCEPT: circulatory system By secreting hormones, the thymus causes which cells to become immunocompetent (fully mature)? T- Lymphocytes The oropharynx does NOT include pharyngeal tonsils The vestibular folds are located ___ to the vocal folds. superiorly Which would NOT be considered part of the conducting zone of the respiratory system? alveoli The walls of the alveoli are composed of two types of cells, type I and type II. The function of type II is to secrete surfactant. Which of the following is NOT found on the left lung? horizontal fissure During inhalation, the diaphram [ Select ] ] and the lungs [ Select ] contracts and expands