| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.29 |
| Score | 0% | 66% |
Which of the following temperatures is least like the others?
-273°C |
|
32°F |
|
absolute zero |
|
0K |
Absolute zero is the coldest possible temperature in the universe. In the Kelvin scale, absolute zero is 0K and in the Celsius scale it is -273°C.
Veins __________ blood at __________ pressure.
deoxygenated, high |
|
oxygenated, high |
|
oxygenated, low |
|
deoxygenated, low |
Veins carry blood back to the heart from the body. While arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood. Like the heart, veins contain valves to prevent blood backflow.
Which of these is important for the body's maintenance, growth, and repair?
carbohydrates |
|
fiber |
|
protein |
|
fats |
Found in both animal sources (meat, fish, eggs, cheese) and vegetables (beans, nuts, some grains), proteins are important for the body's maintenance, growth, and repair.
Respiration is the process by which __________ absorb oxygen and eliminate carbon dioxide.
capillaries |
|
diaphragms |
|
blood cells |
|
bronchioles |
The respiratory system manages respiration which is the process by which blood cells absorb oxygen and eliminate carbon dioxide.
As a cold front moves into an area, the heavier cool air __________ the lighter warm air that it is replacing.
pushes under |
|
mixes with |
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cancels out |
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pushes above |
A cold front is a warm-cold air boundary with the colder air replacing the warmer. As a cold front moves into an area, the heavier cool air pushes under the lighter warm air that it is replacing. The warm air becomes cooler as it rises and, if the rising air is humid enough, the water vapor it contains will condense into clouds and precipitation may fall.