When blood glucose drops, is released to stimulate the release of glucose stored as glycogen?

Glucagon, liver

When blood glucose drops, glucagon is released to stimulate the release of glucose stored as liver glycogen

Glucagon is a peptide hormone, secreted by alpha cells in a part of the pancreas known as the islets of Langerhans. Glucagon is considered as an essential catabolic hormone of the body as it functions by increasing the concentration of glucose and fatty acids in the bloodstream. The glucagon also prevents the liver from absorbing some glucose. This allows more glucose to enter the bloodstream in order to maintain stable levels.

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1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

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