An interconnected series of tubes in the cytoplasm is called the . centrioles
mitochondria
golgi body
endoplasmic reticulum

Endoplasmic reticulum

Explanation:

The endoplasmic reticulum is part of the endomembrane system inside almost all eukaryotic cells.

The membrane is continuous with the nuclear membrane. The endoplasmic reticulum is very important for modifying proteins and transporting them in vesicles to the Golgi body for further processing and transport to their final destinations.

The endoplasmic reticulum can be rough (have ribosomes attached) or smooth (lack ribosomes).

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.