Question 31 ptsWhich of the following statements is CORRECT regarding the permeability of the blood-brain barrier to certain substances?Group of answer choicessmall uncharged molecules can hardly diffuse into the brain across the blood-brain barrierthe blood-brain barrier permits the efficient exchange of CO2 (carbon dioxide)charged molecules can diffuse through the blood-brain barrier easilylarge charged molecules can diffuse through the blood-brain barrierlipid-soluble molecules are usually less permeable than water-soluble molecules through the blood-

From the list below, select three types of molecules that are permeable to the blood-brain barrier without requiring a transport protein.Check All That ApplyGlucoseGlucoseLarge proteinsLarge proteinsOxygenOxygenNicotineNicotineEthanolEthanolPolar moleculesPolar molecules

Question 21 ptsWhich of the following statements is CORRECT regarding the blood-brain barrier?Group of answer choicesmicroglial cells help the endothelial cells to form the blood-brain barrierpericytes form tight junctions between endothelial cells in blood vesselsbrain capillaries lack fenestrations and have high pinocytosistight junctions open and close to control the passage of material through the intercellular spacesthe vascular basement membrane contributes to the integrity of the blood-brain barrier

Which of the following components is the most important contributor to the barrier properties of the blood-brain barrier?Group of answer choicesbinding proteins in the bloodpericytes around blood vesselsastrocyte end-feet encircling blood vesselstight junctions between endothelial cells in blood vesselsthe presence of transporters for some substances in endothelial cells of blood vessels PreviousNext

The cell membrane is ______ permeable.Multiple choice question.freelynot veryselectivelynon-

Which of the following is TRUE about cell membrane?Group of answer choicesCell membrane is selectively permeable.Phospholipids are the major components of cell membranes.Small molecules can diffuse through the cell membrane.All of the statements are true. PreviousNext