Estrogen binds to specific receptors inside many

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Estrogen binds to specific receptors inside many kinds of cells, each of which have different responses to its binding. 40. A human with no access to fresh water but is forced to drink seawater instead will excrete more water molecules than take in, because of the high load of ion ingestion.
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41. Which of the following animals generally has the lowest volume of urine production? A marine bony fish 42. The reason the steroid hormone aldosterone affects only a small number of cells in the body is that only its target cells contain aldosterone receptors. 43. When a person drinks alcohol, the rate of urination increases. This suggests that antidiuretic hormone (ADH) may be affected by alcohol consumption in some way. Alcohol inhibits the release of ADH. 44. Which of the following is a common feature of all hormones? Hormones act as a chemical signal between cells. 45. The osmoregulation/excretory system of a freshwater flatworm is based on the operation of protonephridia. 46. An inactivating mutation in the progesterone receptor gene would likely result in the inability of the uterus to support pregnancy. 47. Kidney diagram 48. Same as 47 Humans have receptos for two kinds of beta adrenerigic compounds such as catecholamines to control cardiac muscle contractions. Some are beta 1 receptors that promote increased heart rate. Other drugs, called beta blockers, slow heart rate. Smooth muscle cells, however, have beta 2 receptors, which meciate muscle relaxation. Blockers of these effects are sometimes used to treat asthma. 49. the use of beta 2 antagonist drug may be useful in asthma becuaae they may dilate the bronchioles by relaxing their smooth muscle. 50. Beta 2 antagonist drug might also be used most effectively for which of the following? increased low blood pressure
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