Q: The net effect of aldosterone is to conserve and increase water levels in the plasma by reducing the excretion of what element, and thus water? Read this paragraph and choose the correct option from the provided answers: Aldosterone Recall that aldosterone increases the excretion of potassium and the reabsorption of sodium in the distal tubule. Aldosterone is released if blood levels of potassium increase, if blood levels of sodium severely decrease, or if blood pressure decreases. Its net effect is to conserve and increase water levels in the plasma by reducing the excretion of sodium, and thus water, from the kidneys. In a negative feedback loop, increased osmolality of the ECF (which follows aldosterone-stimulated sodium absorption) inhibits the release of the hormone (Figure 26.13). Choices: - oxygen - potassium - lithium - sodium A:
sodium

Q: What is the main source of hydrocarbons? Read this paragraph and choose the correct option from the provided answers: Hydrocarbons are extremely important to modern life. Their most important use is as fuels. Hydrocarbons are also used to manufacture many products including plastics. The main source of hydrocarbons is fossil fuels. Choices: - photosynthesis - greenhouse gases - decomposers - fossil fuels A:
fossil fuels

Q: When blood vessels in the head dilate, what kind of severe headache can occur? Read this paragraph and choose the correct option from the provided answers: A migraine is a more severe type of headache. It occurs when blood vessels in the head dilate, or expand. This may be triggered by certain foods, bright lights, weather changes, or other factors. People with migraines may also have nausea or other symptoms. Fortunately, migraines can often be relieved with prescription drugs. Choices: - malignant - chronic headache - tension headache - migraine A:
migraine

Q: Chemistry is the study of matter and energy and how they what? Read this paragraph and choose the correct option from the provided answers: Chemistry is the study of matter and energy and how they interact, mainly at the level of atoms and molecules. Basic concepts in chemistry include chemicals and chemical reactions. Choices: - distinct - division - interaction - interact A:
interact