Based on the information in the passage, the two correct answers that complete the graphic organizer are:
- to cool the brain
- to build up oxygen
"Why are yawns contagious? We asked a scientist"by Teresa CareyWhy do we yawn?There is no scientific consensus on why we yawn. One theory argues that when humans are tired, we stop taking deep breaths, which causes a build-up of carbon dioxide in the body, said Douglas Parham, a speech scientist at Wichita State University. A yawn might be a special kind of respiration, Parham said. It builds up oxygen quickly, while expelling carbon dioxide, even more than a deep breath. Excess carbon dioxide and other chemical changes, such as a drop in oxygen or increase in a compound called adenosine, could also act as “yawn gates,” said James Giordano, a neuroethicist and neuroscientist at Georgetown University. These chemicals send out a signal that triggers a yawn. By yawning, we compress the muscles of the face, driving oxygen-enriched blood to the brain, Giordano said. Other proposals state the purpose of yawning is to cool the brain, or to stretch internal organs like tissues and lungs, helping the body to liven up.© NewsHour Productions LLC. All Rights Reserved.QuestionUse the passage from “Why are yawns contagious? We asked a scientist.” to answer the question.Effect: We yawn.Cause: to quickly expel carbon dioxideCause: to drive oxygen-enriched blood to the brainCause: to stretch internal organsCause: ?Cause: ?Based on the information in the passage, which cause completes the graphic organizer? Select the two correct answers.(1 point)Responsesto increase the frequency of deep breathsto increase the frequency of deep breathsto cool the brainto cool the brainto compress facial musclesto compress facial musclesto increase adenosine levelsto increase adenosine levelsto build up oxygento build up oxygen
1 answer