| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.81 |
| Score | 0% | 56% |
The __________ nervous system regulates involuntary activity in the heart, stomach, and intestines.
somatic |
|
central |
|
peripheral |
|
autonomic |
Part of the peripheral nervous system, the autonomic nervous system regulates involuntary activity in the heart, stomach, and intestines.
-40°F is how many °C?
\({40 \over 9}\) |
|
-8 |
|
\(-{40 \over 9}\) |
|
-40 |
The formula to convert from F° to C° is:
\(C° = {5 \over 9} (F° - 32)\)
plugging in our values gives:
\(C° = {5 \over 9} (-40 - 32)\)
\(C° = {5 \over 9} (-72) = {{-72 \times 5} \over 9}\)
\(C° = {-360 \over 9}\)
\(C° = -40\)
The pitch of the siren of an approaching ambulance changes as it approaches you. This is an example of which of the following?
sound radiation |
|
refraction |
|
reflection |
|
Doppler effect |
The Doppler effect occurs when the source or listener (or both) of sound waves is moving. If they're moving closer together, the listener perceives the sound with a higher pitch and, when they're moving apart, the listener perceives the sound with a lower pitch.
Veins __________ blood at __________ pressure.
deoxygenated, low |
|
deoxygenated, high |
|
oxygenated, high |
|
oxygenated, 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.
In cell biology, where does DNA replication take place?
cytoplasm |
|
nucleus |
|
mitochondria |
|
Golgi apparatus |
The cell nucleus contains the genetic material of the cell and is where DNA replication takes place.