| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.67 |
| Score | 0% | 73% |
What is a major difference between the somatic and autonomic nervous systems?
each belongs to a different nervous system |
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one controls thinking, the other controls feeling |
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one controls voluntary activity, one controls involuntary activity |
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one is inherited, the other is learned |
Both are part of the peripheral nervous system. The somatic nervous system sends sensory information to the central nervous system and controls voluntary actions while the autonomic nervous system regulates involuntary activity in the heart, stomach, and intestines.
Which of the following is not a base unit in the metric system?
degree Fahrenheit |
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liter |
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gram |
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meter |
The Fahrenheit scale is used for measuring temperature in the British system. The metric system uses the Celsius scale.
Which of the following is not a characteristic of the Sun?
formed 2.6 billion years ago |
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makes up over 99% of the mass of the solar system |
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is a yellow dwarf star |
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is composed of hydrogen and helium |
The Sun is a G-type main-sequence star (G2V) but is informally known as a yellow dwarf star. Composed of 73% hydrogen and 25% helium, the hot plasma that makes up the Sun reaches 9,900°F (5,505°C) at the surface. It formed approximately 4.6 billion years ago and makes up 99.86% of the mass in the solar system.
In the food chain, bacteria and fungi convert the organic matter in the dead bodies of plants and animals into simple nutrients. Bacteria and fungi are:
primary consumers |
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scavengers |
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decomposers |
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producers |
Decomposers (saprotrophs) are organisms such as bacteria and fungi that break down the organic matter in the dead bodies of plants and animals into simple nutrients.
The heart __________ blood.
oxygenates |
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creates |
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deoxygenates |
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filters |
To provide oxygen to the body, blood flows through the heart in a path formed by the right atrium → right ventricle → lungs → left atrium → left ventricle → body. When blood enters the right side of the heart it is deoxygenated. It enters the left side of the heart oxygenated after traveling to the lungs.