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| 61. | radiation | transfer of heat via infrared waves |
| 62. | reduction | gaining of an electron |
| 63. | salivary amylase | digestive enzyme that is found in the saliva and begins the digestion of carbohydrates in the mouth |
| 64. | secretin | hormone released in the small intestine to aid in digestion |
| 65. | sodium bicarbonate | anion released into the small intestine to neutralize the pH of the food from the stomach |
| 66. | terminal electron acceptor | oxygen, the recipient of the free hydrogen at the end of the electron transport chain |
| 67. | thermoneutral | external temperature at which the body does not expend any energy for thermoregulation, about 84 F |
| 68. | thermoregulation | process of regulating the temperature of the body |
| 69. | transamination | transfer of an amine group from one molecule to another as a way to turn nitrogen waste into ammonia so that it can enter the urea cycle |
| 70. | tricarboxylic acid cycle | (TCA) also called the Krebs cycle or the citric acid cycle; converts pyruvate into CO2 and high-energy FADH2, NADH, and ATP molecules |
| 71. | triglycerides | lipids, or fats, consisting of three fatty acid chains attached to a glycerol backbone |
| 72. | trypsinogen | proenzyme form of trypsin |
| 73. | trypsin | pancreatic enzyme that activates chymotrypsin and digests protein |
| 74. | urea cycle | process that converts potentially toxic nitrogen waste into urea that can be eliminated through the kidneys |
| 75. | vitamins | organic compounds required by the body to perform biochemical reactions like metabolism and bone, cell, and tissue growth |
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