Anatomy and Physiology Practice Questions

Which is TRUE regarding the regulation of heart rate? All of the choices are true. How would a hemorrhage immediately affect the activity of the baroreceptors? The baroreceptors would decrease their rate of firing to all medullary cardiovascular center cell types. An individual donates a pint of...

Which is TRUE regarding the regulation of heart rate? All of the choices are true. How would a hemorrhage immediately affect the activity of the baroreceptors? The baroreceptors would decrease their rate of firing to all medullary cardiovascular center cell types. An individual donates a pint of blood to a blood bank. A few minutes later, which of the following would be decreased compared to pre-donation values? The percentage of cardiac output flowing to the kidneys Following hemorrhage, reflexes are triggered that attempt to compensate for the blood loss. As a result of the blood loss and the reflex mechanisms, which of the following will be TRUE, compared to pre-hemorrhage values? Cardiac output will be decreased and total peripheral resistance will be increased. Which of the following does NOT contribute to increased stroke volume during exercise? Increased length of filling time during diastole Which of the following is most likely to occur when a soldier stands at attention---very still, with legs and spine straight? Increased storage of blood in the veins of the feet and legs Which of the following statements concerning the differences between action potentials in skeletal muscle cells and in ventricular cardiac muscle cells is TRUE? After sodium influx through voltage-gated channels occurs in ventricular cells, prolonged influx of calcium from the extracellular fluid occurs. No such calcium influx occurs in skeletal muscle cells. In a patient with decreased production of plasma proteins, which of the following would be TRUE? More fluid than usual will flow out of the capillary based on the osmotic pressure. You have a patient who is showing signs of edema (tissue swelling) all over the body. In addition to visible swelling in the hands, feet, and face, you can also see evidence of swelling around internal organs when viewing his CAT scan images. Thinking about what you know about the factors that regulate fluid flow from the blood vessels, which of the following causes of edema is most likely? Low plasma protein concentration due to liver failure A hard-working sales clerk is in a busy department store. They have stood completely still behind the check-out counter for an 8-hour shift. At the end of the shift the clerk feels somewhat dizzy and guesses that their blood pressure is quite low. All of the following factors normally contribute to homeostatic blood pressure regulation. Which one is most likely contributing to the clerk\'s symptoms? Decreased skeletal muscle pump Which of the following statements concerning the capillaries is FALSE? Increasing capillary hydrostatic pressure decreases the likelihood that filtration will occur. Which of the following statements concerning control of blood flow through arterioles is TRUE? If the arterial blood pressure to an organ suddenly decreases, arterioles in the organ will dilate in response.