Q: What refers to a substance made from two or more elements joined by chemical bonds? Read this paragraph and choose the correct option from the provided answers: In nature, elements rarely occur alone. Instead, they combine to form compounds. A compound is a substance composed of two or more elements joined by chemical bonds. For example, the compound glucose is an important body fuel. It is always composed of the same three elements: carbon, hydrogen, and oxygen. Moreover, the elements that make up any given compound always occur in the same relative amounts. In glucose, there are always six carbon and six oxygen units for every twelve hydrogen units. But what, exactly, are these "units" of elements?. Choices: - basic - component - contrast - compound A:
compound

Q: Ultraviolet radiation has the highest energy; which has the lowest? Read this paragraph and choose the correct option from the provided answers: Ultraviolet radiation has the highest energy; infrared the lowest. Choices: - kinetic - nuclear - thermal - infrared A:
infrared

Q: What often relies on cooperation between the motor and autonomic nervous systems? Read this paragraph and choose the correct option from the provided answers: Choices: - ketosis - thermoregulation - hypothalamus - homeostasis A:
homeostasis

Q: In the body, oxygen is used by cells of the body's tissues and carbon dioxide is produced as what? Read this paragraph and choose the correct option from the provided answers: Gas Exchange across the Alveoli In the body, oxygen is used by cells of the body's tissues and carbon dioxide is produced as a waste product. The ratio of carbon dioxide production to oxygen consumption is the respiratory quotient (RQ). RQ varies between 0.7 and 1.0. If just glucose were used to fuel the body, the RQ would equal one. One mole of carbon dioxide would be produced for every mole of oxygen consumed. Glucose, however, is not the only fuel for the body. Protein and fat are also used as fuels for the body. Because of this, less carbon dioxide is produced than oxygen is consumed and the RQ is, on average, about 0.7 for fat and about 0.8 for protein. The RQ is used to calculate the partial pressure of oxygen in the alveolar spaces within the lung, the alveolar PO Above, 2 the partial pressure of oxygen in the lungs was calculated to be 150 mm Hg. However, lungs never fully deflate with an exhalation; therefore, the inspired air mixes with this residual air and lowers the partial pressure of oxygen within the alveoli. This means that there is a lower concentration of oxygen in the lungs than is found in the air outside the body. Knowing the RQ, the partial pressure of oxygen in the alveoli can be calculated:. Choices: - oxygen - fuel - food - waste product A:
waste product