41. Removing which of the following glands would most likely have the most wide-

Question

41. Removing which of the following glands would most likely have the most wide- reaching effect on bodily functions of an adult human? A) thyroid gland B) posterior pituitary gland C) D) anterior pituitary gland 42. Aldosterone is a hormone that binds to an intracellular receptor and migrates to the nucleus. Insulin is a hormone that binds to extracellular receptors on the plasma membrane. What is the most likely reason for this difference? A) Aldosterone is hydrophilic; it dissolves in the aqueous environment of the cytoplasm and nucleus. B) Aldosterone is lipid-soluble, it easily crosses the plasma membrane. C) Aldosterone is too small to bind receptors on the plasma membrane. D) Aldosterone is hydrophilic and cannot bind receptors on the plasma membrane. 43. Which of the following statements about homeostasis is false? A) It depends primarily on positive feedback B) It is the maintenance of a steady physiological state within an organism or cell. C) It is necessary for proper functioning of the body. D) The endocrine system plays a major role in maintaining homeostasis. E) It depends on negative feedback. 44. Why do some body cells not respond to a particular hormone? A) It does not express the corresponding receptor for the hormone. B) It is not located in the appropriate area of the body C) It is already over-activated and won't respond to any more hormones. D) It is too busy responding to other hormones. 45. In a mammal's bloodstream, where would you expect to find oxygen? A) dissolved in blood plasma B) attached to myoglobin in red blood cells C) attached to hemoglobin in red blood cells D) both dissolved in blood plasma and attached to hemoglobin in red blood cells 6. Which of the following statements about hemoglobin are true? A) Hemoglobin binds four molecules of oxygen. B) Atagiven pOz, adult hemoglobin binds less O2 than fetal hemoglobin. Myoglobin has a greater affinity for O2 than hemoglobin. D) Atagiven pOz, adult hemoglobin binds less O2 than myoglobin. E) All of the above are true.

Explanation / Answer

41    D MOST OF THE HORMONES ARE SCRETED AND REGULATED BY IT

42    B NORMALLY LIPID SOLUBLE CAN CROSS PLASMA MEMBRANE

43    E WORKS ON POSIITVE FEEDBACK

44    A

45   C

46   D

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