| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.28 |
| Score | 0% | 66% |
Which of these does not contain oxygenated blood?
right atrium |
|
pulmonary vein |
|
left ventricle |
|
aorta |
To provide oxygen to the body, blood flows through the heart in a path formed by the right atrium → right ventricle → lungs → left atrium → left ventricle → body. When blood enters the right side of the heart it is deoxygenated. It enters the left side of the heart oxygenated after traveling to the lungs.
What is a major difference between the somatic and autonomic nervous systems?
one is inherited, the other is learned |
|
each belongs to a different nervous system |
|
one controls thinking, the other controls feeling |
|
one controls voluntary activity, one controls involuntary activity |
Both are part of the peripheral nervous system. The somatic nervous system sends sensory information to the central nervous system and controls voluntary actions while the autonomic nervous system regulates involuntary activity in the heart, stomach, and intestines.
Which of the following substances gives up positively charged hydrogen ions (H+) when dissolved in water?
acid |
|
alkaline |
|
base |
|
solution |
An acid is a substance that gives up positively charged hydrogen ions (H+) when dissolved in water. A base (alkaline) gives up negatively charged hydroxide ions (OH-) when dissolved in water. pH is a scale that measures of how basic or acidic a solution is. Numbered from 0 to 14, solutions with a pH of 7 are neutral, less than 7 are acidic, more than 7 are alkaline.
A biological community of interacting organisms and their physical environment is known as:
biome |
|
community |
|
population |
|
ecosystem |
An ecosystem is a biological community of interacting organisms and their physical environment. This includes both the biotic (living) and abiotic (non-living).
Arteries carry __________ blood at __________ pressure.
oxygenated, low |
|
deoxygenated, high |
|
oxygenated, high |
|
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.