| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.27 |
| Score | 0% | 65% |
Elements that belong to the same period in the Periodic Table of the Elements have the same number of:
protons |
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electron shells |
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atomic mass units |
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electrons |
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.
What part of the brain is responsible for for balance, movement, and muscle coordination?
cerebellum |
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medulla |
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cerebrum |
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brainstem |
The cerebellum is a large cluster of nerves at the base of the brain that's responsible for balance, movement, and muscle coordination.
When compared to eukaryotic cells, prokaryotic cells are:
none of these |
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less complex |
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more complex |
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similarly complex |
Cells are classified into one of two groups based on whether or not they have a nucleus. Eukaryotic cells have a nucleus, prokaryotic cells do not have a nucleus and therefore have a less complex structure than eukaryotic cells.
Which of blood component allows blood to clot?
plasma |
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white blood cells |
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platelets |
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red blood cells |
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.
What prevents blood pumped out of the ventricles from flowing back into the heart?
atria |
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platelets |
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capillaries |
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valves |
The heart is the organ that drives the circulatory system. In humans, it consists of four chambers with two that collect blood called atria and two that pump blood called ventricles. The heart's valves prevent blood pumped out of the ventricles from flowing back into the heart.