Cells of capillaries that nourish the cells of the central nervous system are joined by tight junctions,whereas the capillaries to most other organs are characterized by having large openings or clefts between adjacent cells.How would the difference in cell-cell connections affect their functions?
A)Capillaries of the blood-brain barrier are more likely to rupture.
B)The blood-brain barrier is more selective regarding the types of molecules that can pass out of circulation.
C)There is more pressure on the blood passing through the central nervous system than to other organs.
D)Capillaries of the central nervous system are more tightly anchored to adjacent tissues.

Question

Quizplus · Accepted Answer

The tight junctions between cells of the capillaries in the central nervous system create a selective barrier known as the blood-brain barrier. This prevents certain substances, such as toxins and pathogens, from reaching the brain and spinal cord. In contrast, the large openings in capillaries to other organs allow for easier exchange of nutrients and waste products between blood and tissues. Therefore, the difference in cell-cell connections affects the functions of capillaries by determining the types of molecules that can pass through them.

Cells of Capillaries That Nourish the Cells of the Central