What are main categories of mutations that occur in humans?

There are three types of DNA Mutations: base substitutions, deletions and insertions. Single base substitutions are called point mutations, recall the point mutation Glu > Val which causes sickle-cell disease. Point mutations are the most common type of mutation and there are two types.

Explanation:

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hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

they absorb it i think

not sure

you