Places injected insulin.. Under the skin where it is absorbed slowly and extends into effect for a long time. Into a vein or muscle where it is absorbed quickly

* In cases of natural insulin is injected under the skin where it is absorbed slowly and extends into effect for a long time.

* In emergency cases and diabetic coma insulin is injected into a vein or muscle, where it is absorbed quickly and continue to effect only for a limited minutes and thus given insulin doses in a row. It uses insulin rapid water only for injection into a vein.