| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.83 |
| Score | 0% | 77% |
__________ is caused by a lack of iron in the diet.
anemia |
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scurvy |
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diabetes |
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shingles |
Anemia, which may cause weakness, dizziness, and headaches is caused by a lack of iron in the diet.
The respiratory and circulatory systems are similar in that they:
transport nutrients |
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deoxygenate blood |
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add carbon dioxide |
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transport oxygen |
Like the respiratory system, the circulatory system serves to transport oxygen throughout the body while removing carbon dioxide. In addition, the circulatory system transports nutrients from the digestive system.
A human heart consists of how many chambers?
4 |
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1 |
|
2 |
|
8 |
The heart is the organ that drives the circulatory system. In humans, it consists of four chambers with two that collect blood called atria and two that pump blood called ventricles. The heart's valves prevent blood pumped out of the ventricles from flowing back into the heart.
Which of the following is the correct order for types of radiation from longest to shortest wavelength?
infrared waves → microwaves → ultraviolet light |
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visible light → ultraviolet light → radio waves |
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microwaves → radio waves → visible light |
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radio waves → visible light → gamma rays |
The electromagnetic spectrum covers all possible wavelengths and frequencies of radiation. From lowest frequency (longest wavelength) to highest frequency (shortest wavelength) radiation: radio waves → microwaves → infrared waves → visible light → ultraviolet light → X-rays → gamma rays.
A major difference between sound waves and light waves is which of the following?
a sound wave is mechanical while a light wave is electromagnetic |
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a sound wave is much slower than a light wave |
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all of these are correct |
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a sound wave cannot travel through a vacuum |
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.