What moon phase is seen from Earth when the moon is
nearest the sun?

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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.

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.