| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.45 |
| Score | 0% | 69% |
Large, puffy, mid-altitude clouds with a flat base and a rounded top describe which of the following?
cumulus clouds |
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stratus clouds |
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fog |
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cirrus clouds |
Cumulus clouds are large, puffy, mid-altitude clouds with a flat base and a rounded top. These clouds grow upward and can develop into a cumulonimbus or thunderstorm cloud.
What part of the nervous system controls simple reflexes?
medulla |
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cerebrum |
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autonomic |
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spinal cord |
The spinal cord connects the brain to the body's network of nerves. It carries impulses between all organs and the brain and controls simple reflexes.
"For every action, there is an equal and opposite reaction." This describes which of Newton's laws of motion?
third |
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first |
|
fourth |
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second |
Newton's third law of motion states that For every action, there is an equal and opposite reaction. When an object exerts a force on another object, the second object exerts a force of equal magnitude in the opposite direction on the first object.
What prevents blood pumped out of the ventricles from flowing back into the heart?
platelets |
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valves |
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atria |
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capillaries |
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.
Food is mixed with gastric acid and pepsin in the __________ to help break down protein.
stomach |
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small intestine |
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large intestine |
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mouth |
Food is mixed with gastric acid and pepsin in the stomach to help break down protein.