| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.04 |
| Score | 0% | 61% |
Atoms of an element whose atoms can vary in the number of neutrons in their nucleus are called which of the following?
reactants |
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ions |
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products |
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isotopes |
The atomic mass of an element listed in the Periodic Table represents the average mass of a single atom of that element and is measured in atomic mass units (amu). This number is an average as some elements have isotopes with atoms that vary in their number of neturons and, therefore, differ in weight.
Veins __________ blood at __________ pressure.
oxygenated, low |
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oxygenated, high |
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deoxygenated, low |
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deoxygenated, high |
Veins carry blood back to the heart from the body. While arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood. Like the heart, veins contain valves to prevent blood backflow.
During digestion, after proteins are broken down where does the undigested food go next?
small intestine |
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large intestine |
|
esophagus |
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stomach |
Food is mixed with gastric acid and pepsin in the stomach to help break down protein.
The envelope of gases surrounding the planet is called the:
hydrosphere |
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geosphere |
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atmosphere |
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lithosphere |
The biosphere is the global ecological system integrating all living beings and their relationships. This includes their interactions with the lithosphere (the rigid outer part of the earth, consisting of the crust and upper mantle), hydrosphere (all surface water), and atmosphere (the envelope of gases surrounding the planet).
Blood pressure is generally highest in which of the following?
heart |
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veins |
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arteries |
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capillaries |
Arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood.