Biology 256 Actual Exam 4 Questions with Correct Answers

Biology 256 Actual Exam 4 Questions with Correct Answers The factors responsible for holding the lungs open include - Answer-surface tension of pleural fluid and no outside opening to the pleural cavity Surfactant helps to prevent the alveoli from collapsing by - Answer-by reducing the surface tension of alveolar fluid Oxygen and carbon dioxide are exchanged in the lungs and through all cell membranes by - Answer-diffusion Which of the following correctly describes mechanisms of CO2 transport - Answer-the chloride shift mechanism enhances CO2 transport Which statement about CO2 is INCORRECT - Answer-CO2 not transported by RBC's Smooth transitions between inspiration and expiration are controlled by the - Answer-pons respiratory centers When a person holds their breath as long as they can, they have induced - Answer-respiratory acidosis Which is a site of reabsorption but not secretion - Answer-loop of Henle What would happen if the kidney's capsular hydrostatic pressure were increased above normal - Answer-net filtration would decrease The mechanism allowing water reabsorption by the renal tubules is - Answer-osmosis The kidneys respond to a rise in plasma pH by - Answer-secreting bicarbonate Which part of the kidney is hypertonic, aiding in water reabsorption - Answer-medulla An increase in the permeability of the cells of the collecting tubule to water is due to - Answer-an increase in the production of ADH If the glomerular filtration rate is low, you expect the clearance value for urea to be - Answer-low An important characteristic of urine is its specific gravity or density, which is in the range of - Answer-1.001-1.035 Which of the following acts as the trigger for the initiation of micturition (voiding) - Answer-the stretching of the bladder wall serves as the trigger Which is true about antibodies - Answer-they are composed of 2 heavy and 2 light peptide chains