| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.88 |
| Score | 0% | 58% |
Blood is created in:
red blood cells |
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bone marrow |
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the liver |
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the heart |
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.
In the metric system, what prefix represents 103?
centi |
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kilo |
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mega |
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milli |
Kilo is the metric system prefix for 103.
Blood pressure is generally highest in which of the following?
veins |
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heart |
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capillaries |
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arteries |
Arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood.
What part of the nervous system controls simple reflexes?
cerebrum |
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spinal cord |
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autonomic |
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medulla |
The spinal cord connects the brain to the body's network of nerves. It carries impulses between all organs and the brain and controls simple reflexes.
Which of the following is true about species groups?
a community is made up of a group of populations |
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a population is made up of a group of communities |
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a biome is a made up of a group of biospheres |
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an ecosystem is a biological population |
A population is a group of organisms of the same species who live in the same area at the same time. A community is a group of populations living and interacting with each other in an area.