| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.33 |
| Score | 0% | 67% |
The ozone layer is in which of Earth's atmospheric layers?
stratosphere |
|
thermosphere |
|
troposphere |
|
mesosphere |
The stratosphere is just above the troposphere and is stratified in temperature with warmer layers higher and cooler layers closer to Earth. This increase in temperature is a result of absorption of the Sun's radiation by the ozone layer.
What part of the nervous system controls simple reflexes?
medulla |
|
autonomic |
|
spinal cord |
|
cerebrum |
The spinal cord connects the brain to the body's network of nerves. It carries impulses between all organs and the brain and controls simple reflexes.
Water freezing or boiling is an example of which of the following?
cooling |
|
phase transition |
|
sublimation |
|
heating |
A substance undergoes a phase transition when it moves from one state of matter to another, for example, when water freezes or boils.
During digestion, after proteins are broken down where does the undigested food go next?
esophagus |
|
small intestine |
|
stomach |
|
large intestine |
Food is mixed with gastric acid and pepsin in the stomach to help break down protein.
What is a major difference between the somatic and autonomic nervous systems?
one controls voluntary activity, one controls involuntary activity |
|
each belongs to a different nervous system |
|
one controls thinking, the other controls feeling |
|
one is inherited, the other is learned |
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.