| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.37 |
| Score | 0% | 67% |
The two heart chambers that pump blood called:
valves |
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atria |
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aorta |
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ventricles |
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.
A subatomic particle found in the nucleus of an atom. It carries a positive electric charge. This desribes which of the following?
electron |
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atom |
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neutron |
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proton |
A proton is a subatomic particle found in the nucleus of an atom. It carries a positive electric charge.
Which of the following describes the Earth's mantle?
makes up most of Earth's volume |
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dense |
|
all of these |
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hot |
Mantle makes up 84% of the Earth's volume and has an average thickness of approximately 1,800 miles (2,900 km). It is dense, hot, and primarily solid although in places it behaves more like a viscous fluid as the plates of the upper mantle and crust gradually "float" along its circumference.
__________ is caused by a lack of Vitamin C.
diabetes |
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anemia |
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shingles |
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scurvy |
Scurvy is a difficiency disease caused by a lack of Vitamin C in the diet.
Within DNA, a variety of a particular gene is called a(n):
homozygous |
|
chromosome |
|
allele |
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heterozygous |
The gene is the base unit of inheritance and is contained within DNA. A gene may come in several varieties (alleles) and there are a pair of alleles for every gene. If the alleles are alike, a person is homozygous for that gene. If the alleles are different, heterozygous.