| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.40 |
| Score | 0% | 68% |
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 controls voluntary activity, one controls involuntary activity |
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one is inherited, the other is learned |
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 is not a medium for sound waves?
none of these is a medium for sound waves |
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vacuum |
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liquid |
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solid |
A vibrating object produces a sound wave that travels outwardly from the object through a medium (any liquid or solid matter). The vibration disturbs the particles in the surrounding medium, those particles disturb the particules next to them, and so on, as the sound propagates away from the vibration.
This skeletal system is common in arthropods like insects, spiders, and crustaceans.
vertebrate |
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exoskeleton |
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endoskeleton |
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bone |
An exoskeleton (external skeleton) is common in arthropods like insects, spiders, and crustaceans.
Which of the following substances gives up negatively charged hydroxide ions (OH-) when dissolved in water?
ion |
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acid |
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hydrogen |
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base |
An acid is a substance that gives up positively charged hydrogen ions (H+) when dissolved in water. A base (alkaline) gives up negatively charged hydroxide ions (OH-) when dissolved in water. pH is a scale that measures of how basic or acidic a solution is. Numbered from 0 to 14, solutions with a pH of 7 are neutral, less than 7 are acidic, more than 7 are alkaline.
A major difference between sound waves and light waves is which of the following?
a sound wave is much slower than a light wave |
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a sound wave cannot travel through a vacuum |
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all of these are correct |
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a sound wave is mechanical while a light wave is electromagnetic |
A vibrating object produces a sound wave that travels outwardly from the object through a medium (any liquid or solid matter). The vibration disturbs the particles in the surrounding medium, those particles disturb the particules next to them, and so on, as the sound propagates away from the vibration.