| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.36 |
| Score | 0% | 67% |
Which of these is not a component of blood?
white blood cells |
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marrow |
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red blood cells |
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plasma |
Blood is created in bone marrow and is made up of cells suspended in liquid plasma. Red blood cells carry oxygen, white blood cells fight infection, and platelets are cell fragments that allow blood to clot.
Elements that belong to the same period in the Periodic Table of the Elements have the same number of:
electrons |
|
electron shells |
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atomic mass units |
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protons |
The rows of the Periodic Table are called periods and contain elements that have the same number of electron shells ordered from lower to higher atomic number.
The rate of vibration of sound is called:
amplitude |
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volume |
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frequency |
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period |
The rate of vibration of sound is called frequency and is measured in hertz (Hz). One hertz is one repetition per second and sounds with high frequency have a higher pitch than sounds with lower frequency. Humans can hear sounds in the range of 20 Hz to 20 kHz.
In the metric system, what prefix represents 103?
kilo |
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milli |
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centi |
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mega |
Kilo is the metric system prefix for 103.
The heart __________ blood.
deoxygenates |
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creates |
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oxygenates |
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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.