WHAT IS TRUE ABOUT CELL PARTICLES PLEAS HEL Particles move against the concentration gradient through the help of a carrier protein.

Particles move only when directed by the cell’s nucleus.

Particles move across the membrane if energy is available.

Particles move from an area of high concentration to low concentration.

D

Explanation:

Particles move from a region of higher concentration to a region of lower concentration until the molecules are evenly contributed

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.