| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.11 |
| Score | 0% | 62% |
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:
decomposers |
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scavengers |
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producers |
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primary consumers |
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.
During digestion, after proteins are broken down where does the undigested food go next?
large intestine |
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esophagus |
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small intestine |
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stomach |
Food is mixed with gastric acid and pepsin in the stomach to help break down protein.
The process of diffusion allows __________ to exchange oxygen, carbon dioxide, nutrients, and waste between blood and the body's cells.
veins |
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red blood cells |
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capillaries |
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arteries |
Capillaries are small thin-walled vessels that permit the exchange of oxygen, carbon dioxide, nutrients, and waste between blood and the body's cells. This process of exchange is called diffusion.
Plant cells are surrounded by:
a cell membrane and a cell wall |
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only a cell wall |
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neither a cell membrane nor a cell wall |
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only a cell membrane |
Animal cells are surrounded by a semipermeable membrane which allows for the transfer of water and oxygen to and from the cell. In plant cells, the cell membrane is surrounded by a somewhat rigid cell wall which provides the cell structure and support.
In the heart, blood flows from the right __________ to the lungs then back to the heart via the left __________.
atrium, ventricle |
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ventricle, ventricle |
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atrium, atrium |
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ventricle, atrium |
The two largest veins in the body, the venae cavae, pass blood to the right ventricle which pumps the blood to the lungs through the pulmonary artery. Blood picks up oxygen in the lungs and returns it to the left atrium via the pulmonary vein.