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building blocks of life

Cells are the basic building blocks of living things. The human body is composed of trillions of cells, all with their own specialised function. 

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.

it creates acid rain