Question

46 An electrocardiogram (ECG) provides information about B) the rhythm of heart contractions D) the speed of blood flow through the blood vessels A) the pressure of blood in the heart chambers C) the amount of oxvgen in the blood as it leaves the heart 47 The velocity of blood flow is the lowest in capillaries because A) the capillaries have internal valves that slow the flow of blood B) the diastolic blood pressure is too low to deliver blood to the capillaries at a high flow rate C) the systemic capillaries are supplied by the left ventricle, which has a lower cardiac output than the right ventricle D) the total cross-sectional area of the capillaries is greater than the total cross-sectional area of the arteries or any other part of the circulatory system 48. Small swollen areas in the neck, groin, and axillary regicon are associated with A) increased activity of the immune system B) blood sugar that is abnormally high D) sodium depletion C) dehydration 49, In order for blood to always flow unidirectionally through a closed circulatory system, the A) blood vessels farthest from the heart must have valves C) arteries must be elastic B) capillaries must have a thick endotheliium D) pressure in all vessels must be equal 50. You cut your finger, and after putting pressure on the wound for several minutes, you notice that it is still bleeding profusely What may be the problem' A) Platelets are not functioning properly. or there are too few to be effective. C) There are too many antigens to allow clotting. B) Mast cells are not releasing their chemical messengers D) Hemoglobin levels are too high to allow clotting 51. Cyanide poisons mitochondria by blocking the final step in the electron transport chain. Human red blood cells placed in an isotonic solution containing cyanide are likely to B) lyse as the cyanide concentration increases inside the cell A) retain the nrmal cell shape, but the mitochondria will be poisoned C) switch to anacrobic metabolism D) be unaffected 52. What is the only type of chemical signal that dees not alter the physiology of the animal producing that signal? A) neural B) paracrine C) neuroendocrine D) pheromones 53. A cell with membrane-bound proteins that selectively bind a specific hormone is called that hormone's A) secretory cell B) endocrine cell C) target cell D) regulatory cell 54. Different body cells can respond differently to the same polypeptide hormones because A) different target cells have different sets of genes B) a target cell's response is determined by the components of its signal transduction pathways C) the circulatory system regulates responses to hormones by routing the hormones to specific targets D) the hormone is chemically altered in different ways as it travels through the circulatory system. A) are modificd fatty acids that stimulate bone and cartilage growth 55. Growth factors are local regulators that B) are found on the surface of cancer cells and stimulate abnormal cell division C) bind to cell-surface receptors and stimulate growth and development of target cells D) convey messages between nerve cells. 56. A cluster of tumor cells that produces and secretes growth factors to induce sSurrounding cells to grow and divide is showing В) рагастiпe which type of cell-to-cell signaling? A) autocrine C) endocrine D) neuroendocrine 57, Which of the following has both endocrine and exocrine activity? A) the pituitary gland C) salivary glands B) parathyroid glands D) the pancreas A) ecdysteroid 58. The steroid hormone that coordinates molting in arthropods is C) thyroxine B) glucagon D) growth hormone 59. Hormones secreted by the posterior pituitary gland are made in the B) thalamus A) cerebellum C) hypothalamus D) anterior pituitary gland 60. Fight-or-flight reactions include activation of the B) anterior pituitary gland, leading to cessation of gonadal function C) adrenal medulla, leading to increased secretion of epinephrine D) pancreas, leading to a reduction in the blood sugar concentration A) parathyroid glands, leading to increased metabolic rate 4

Answer 1

46. An ECG provide information about rythym of heart contraction. Hence, option b is correct.

47. The velocity of blood flow is lowest in capillaries because the total cross sectional area of capillaries is greater than cross sectional of artery. Hence, option d is correct.

48. Small swollen area in the neck, groin and axillary region are associated with increased activity of immune system. Hence, opt-in a is correct.

49. In order for blood to always flow unidirectionally through a closed circulatory system, blood vessels farthest from the heart have valves. Hence, option a is correct.