| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.22 |
| Score | 0% | 64% |
The __________ nervous system regulates involuntary activity in the heart, stomach, and intestines.
autonomic |
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somatic |
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central |
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peripheral |
Part of the peripheral nervous system, the autonomic nervous system regulates involuntary activity in the heart, stomach, and intestines.
This skeletal system is common in arthropods like insects, spiders, and crustaceans.
endoskeleton |
|
vertebrate |
|
bone |
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exoskeleton |
An exoskeleton (external skeleton) is common in arthropods like insects, spiders, and crustaceans.
Veins __________ blood at __________ pressure.
deoxygenated, high |
|
deoxygenated, low |
|
oxygenated, high |
|
oxygenated, low |
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.
Atoms of an element whose atoms can vary in the number of neutrons in their nucleus are called which of the following?
ions |
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products |
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reactants |
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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.
Arteries carry __________ blood at __________ pressure.
oxygenated, high |
|
oxygenated, low |
|
deoxygenated, low |
|
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.