A student is frightened by a dog and runs away.
The changes in the concentration of adrenaline in the student’s blood are shown in the graph.
What explains the gradual fall in the adrenaline concentration after the fright?
It is destroyed by the liver.
2 )
It is reabsorbed by the glands that produced it.
3 )
It is respired to release energy.
4 )
It is used up by the contracting muscles.
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