Endocrine anatomy Flashcards
what is the difference between a continuous capillary and a fenestrated capillary
continuous have a continuous endothelial lining = lower permeability
fenestrated have pores and make them more permeable
what cells make up most of the blood brain barrier
Astrocytes are the main cells of the BBB. Both these and pericytes are crucial for the function of the blood-brain barrier
what is a pinocytotic vesicle
A pinocytotic vesicle is a small membrane-wrapped “bubble” of extracellular fluid which has been taken in by a cell.
what is the function of pinocytosis and why is it present in the image below
Pinocytosis is the first part of the mechanism for transporting macromolecules across the endothelium (transcytosis). Transcytosis can be a highly specific mechanism for transporting only certain molecules, hence its importance in the BBB. Both continuous and fenestrated capillaries need to use transcytosis to move macromolecules.
label
label. what are the circled structures meant to be
top = pineal gland
bottom = pituatary gland
what weight? label
