| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.12 |
| Score | 0% | 62% |
During digestion, after proteins are broken down where does the undigested food go next?
esophagus |
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stomach |
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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.
Which of the following is not true of light waves?
are mechanical waves |
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travel faster than sound waves |
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are electromagnetic waves |
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can travel through a vacuum |
Unlike mechanical sound waves that require a physical medium for propagation, light waves are electromagnetic and can travel through empty space. Light waves are also much faster, travelling at 186,000 m/s vs. 343 m/s for sound waves.
Which of the following is the primary difference between a comet and an asteroid?
comets orbit the Sun |
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asteroids have a coma |
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comets have an atmosphere |
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asteroids contain frozen water |
A comet is a loose collection of ice, dust, and small rocky particles that, in contrast to an asteroid, has an extended atmosphere surrounding the center. When passing close to the Sun, this atmosphere warms and begins to release gases forming a visible coma or tail.
The respiratory and circulatory systems are similar in that they:
deoxygenate blood |
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add carbon dioxide |
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transport nutrients |
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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.
During digestion, where is digested food absorbed into the blood stream?
small intestine |
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large intestine |
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pancreas |
|
stomach |
The small intestine is where most digestion takes place. As food travels along the small intestine it gets broken down completely by enzymes secreted from the walls. These enzymes are produced in the small intestine as well as in the pancreas and liver. After the enzymes break down the food, the resulting substances are then absorbed into the blood via capillaries in the small intestine walls.