| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.37 |
| Score | 0% | 67% |
Sound travels fastest through which of the following media?
vacuum |
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water |
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metal |
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air |
The speed of a sound wave will vary with the medium. Sound travels fastest through media that has particles that are very close together, like metal. Thus, it travels faster through water than through air and doesn't travel at all through a vacuum (there are no particles in empty space to vibrate).
What is a major difference between the somatic and autonomic nervous systems?
one controls thinking, the other controls feeling |
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each belongs to a different nervous system |
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one is inherited, the other is learned |
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one controls voluntary activity, one controls involuntary activity |
Both are part of the peripheral nervous system. The somatic nervous system sends sensory information to the central nervous system and controls voluntary actions while the autonomic nervous system regulates involuntary activity in the heart, stomach, and intestines.
Which of the following describes the Earth's outer core?
solid |
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makes up most of the Earth's volume |
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liquid |
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primarily solid |
The Earth's core is divided into the liquid outer core (1,430 miles or 2,300 km radius) and the solid inner core (745 miles or 1,200 km radius).
Which of these is not a type of fat?
cholesterol |
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monounsaturated |
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saturated |
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polyunsaturated |
Fats come in three types, saturated (meats, shellfish, eggs, milk), monounsaturated (olives, almonds, avocados), and polyunsaturated (vegetable oils).
Food is mixed with gastric acid and pepsin in the __________ to help break down protein.
stomach |
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mouth |
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small intestine |
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large intestine |
Food is mixed with gastric acid and pepsin in the stomach to help break down protein.