| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.81 |
| Score | 0% | 56% |
In the heart, blood flows from the right __________ to the lungs then back to the heart via the left __________.
atrium, ventricle |
|
ventricle, ventricle |
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ventricle, atrium |
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atrium, atrium |
The two largest veins in the body, the venae cavae, pass blood to the right ventricle which pumps the blood to the lungs through the pulmonary artery. Blood picks up oxygen in the lungs and returns it to the left atrium via the pulmonary vein.
The __________ nervous system regulates involuntary activity in the heart, stomach, and intestines.
peripheral |
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autonomic |
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central |
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somatic |
Part of the peripheral nervous system, the autonomic nervous system regulates involuntary activity in the heart, stomach, and intestines.
When compared to eukaryotic cells, prokaryotic cells are:
less complex |
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none of these |
|
similarly complex |
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more complex |
Cells are classified into one of two groups based on whether or not they have a nucleus. Eukaryotic cells have a nucleus, prokaryotic cells do not have a nucleus and therefore have a less complex structure than eukaryotic cells.
Which of the following does not represent the freezing point of water?
0°C |
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0°F |
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32°F |
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273K |
The Fahrenheit scale fixes the freezing point of water at 32°F, the Celsuis scale at 0°C, and the Kelvin scale at 273K.
Which of the following would be used in eye glasses to correct nearsightedness?
concave mirror |
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convex mirror |
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convex lens |
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concave lens |
Unlike curved mirrors that operate on the principle of reflection, lenses utilize refraction. A convex lens is thicker in the middle than on the edges and converges light while a concave lens is thicker on the edges than in the middle and diffuses light. A common use for curved lenses is in eye glasses where a convex lens is used to correct farsightedness and a concave lens is used to correct nearsightedness.