Question 18 The blood/brain barrier prevents toxicants from entering the brain due to Otight junctions Oproteins present in the blood Ovesicles to trap toxicants O abundance of pores between cells
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Step 1: The blood-brain barrier is a highly selective semipermeable membrane that separates the circulating blood from the brain extracellular fluid in the central nervous system. Show more…
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Junctions that help form the blood-brain barrier are (a) tight junctions (b) adhering junctions (c) desmosomes (d) gap junctions (e) plasmodesmata
Blood brain barrier in adults have cells ____ junctions between (a) tight (b) adhering (c) gap (d) none of these
Question 13 Which of the following is a property of the blood-brain barrier? The capillary endothelial cells are interconnected by tight junctions and are the least permeable in the body. It is generally permeable to lipid-soluble compounds. Astrocytes surround the CNS capillaries and secrete chemicals that decrease capillary permeability. It is absent in portions of the hypothalamus. All of the answers are correct. Question 14 Which statement is TRUE regarding the meninges and cerebrospinal fluid of the spinal cord and brain? Spinal fluid is produced both in the brain and in the spinal cord areas. The meninges around the brain are not the same as those around the spinal cord. There is a subarachnoid space within the spinal meninges but not the cranial meninges. The choroid plexuses are located only within the brain, not within the spinal cord. Question 15
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