Q.97
Which of the following is not true of the blood-brain barrier:
- Physiological Properties of the Blood-Brain Barrier (BBB):
- The BBB is constituted by continuous, non-fenestrated capillary endothelial cells joined by complex tight junctions (zonula occludens), enveloped by a thick basal lamina and astrocyte end-feet (perivascular glial endfeet).
- Regulatory Direction: The BBB primarily restricts and regulates the influx of substances from the systemic circulation (blood) into the brain extracellular fluid, NOT the passage of substances from brain into blood [Statement 4 is incorrect/FALSE]. (Efflux transporters like P-glycoprotein pump drugs out of endothelial cells back into the capillary lumen).
Correct option: (4) It regulates passage of substances from brain into blood
Explanation not matching this question?
क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?
Report
Want to practice this paper in exam conditions?
क्या आप परीक्षा जैसे माहौल में अभ्यास करना चाहते हैं?
Test yourself in 5-question batch format with timer and hidden answers.
5-प्रश्नों के बैच फॉर्मैट, टाइमर और छिपे उत्तरों के साथ खुद को परखें।
Start Practice Mode →
प्रैक्टिस टेस्ट मोड शुरू करें →