Q: What is considered to be the control center for homeostatic mechanisms? Read this paragraph and choose the correct option from the provided answers: The Hypothalamus The hypothalamus is the control center for many homeostatic mechanisms. It regulates both autonomic function and endocrine function. The roles it plays in the pupillary reflexes demonstrates the importance of this control center. The optic nerve projects primarily to the thalamus, which is the necessary relay to the occipital cortex for conscious visual perception. Another projection of the optic nerve, however, goes to the hypothalamus. The hypothalamus then uses this visual system input to drive the pupillary reflexes. If the retina is activated by high levels of light, the hypothalamus stimulates the parasympathetic response. If the optic nerve message shows that low levels of light are falling on the retina, the hypothalamus activates the sympathetic response. Output from the hypothalamus follows two main tracts, the dorsal longitudinal fasciculus and the medial forebrain bundle (Figure 15.11). Along these two tracts, the hypothalamus can influence the EddingerWestphal nucleus of the oculomotor complex or the lateral horns of the thoracic spinal cord. Choices: - thyroid - hippocampus - adrenal cortex - hypothalamus A:
hypothalamus
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Q: What is the ability to cause changes in matter? Read this paragraph and choose the correct option from the provided answers: Energy is the ability to cause changes in matter. For example, your body uses chemical energy when you lift your arm or take a step. In both cases, energy is used to move matteryou. Any matter that is moving has energy just because it's moving. The energy of moving matter is called kinetic energy. Scientists think that the particles of all matter are in constant motion. In other words, the particles of matter have kinetic energy. The theory that all matter consists of constantly moving particles is called the kinetic theory of matter . You can learn more about the theory at this URL: http://www. youtube. com/watch?v=Agk7_D4-deY . Choices: - force - hydrogen - pressure - energy A:
energy
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Q: What does the precise pattern of a crystal depend on? Read this paragraph and choose the correct option from the provided answers: A crystal contains a three-dimensional array of alternating positive and negative ions. The precise pattern depends on the compound. A crystal of sodium chloride, shown here, is a collection of alternating sodium and chlorine ions. Choices: - chance - mass - age - compound A:
compound
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Q: What kind of mammalian reproduction is risky for the offspring but not the mother? Read this paragraph and choose the correct option from the provided answers: Monotreme reproduction is the least risky for the mother. However, eggs are harder to protect than is an embryo or a fetus in a pouch or uterus. Therefore, monotreme offspring may have a lower chance of surviving than the offspring of therian mammals. Choices: - asexual - sexual - cactaceae - monotreme A:
monotreme
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