Which of these images shows the correct orientation of phospholipids in a biological membrane?

Phospholipids all have a hydrophilic head (phosphate and specialized group in red) and a hydrophobic tail (glycerol and fatty acids in yellow).

Glycerophospholipids correspond to the combination of glycerol, two fatty acids (in yellow), a phosphoric acid and alcohols or amino acids. Alcohols or amino acids give the identity and characteristic of glycerophospholipids. Among the amino acids we find serine and among the alcohols we find inositol, ethanolamine and choline; phosphatidyl serine, phosphatidylinositol, phosphatidyl ethanolamine and phosphatidyl choline are thus obtained.

you cant do nothing!

you are dead mate!

say your prayers cause this is your last life!

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.