AP Biology Questions on Cerebrospinal Fluid: Prepare for Your Exam

📚 Quick Study Guide

• 🧠 Definition: Cerebrospinal fluid (CSF) is a clear, colorless body fluid found in the brain and spinal cord.
• 🧪 Production: CSF is produced by the choroid plexus in the brain ventricles.
• 🛡️ Function:
  • Cushions the brain and spinal cord.
  • Removes waste products.
  • Helps maintain a stable chemical environment.
• 🔄 Circulation: CSF circulates through the ventricles and subarachnoid space before being reabsorbed into the bloodstream.
• 🔬 Composition: CSF contains water, electrolytes, glucose, proteins, and some white blood cells.
• 📈 Pressure: Normal CSF pressure ranges from 70-180 mm H2O.

🧪 Practice Quiz

1. Which of the following structures produces cerebrospinal fluid?
   1. A) Arachnoid villi
   2. B) Choroid plexus
   3. C) Dura mater
   4. D) Pia mater
2. What is the primary function of cerebrospinal fluid?
   1. A) To provide nutrients to the brain tissue
   2. B) To cushion and protect the brain and spinal cord
   3. C) To transport oxygen to the brain
   4. D) To regulate body temperature
3. Where does cerebrospinal fluid circulate after being produced?
   1. A) Liver and kidneys
   2. B) Brain ventricles and subarachnoid space
   3. C) Heart and lungs
   4. D) Stomach and intestines
4. Which component is NOT typically found in cerebrospinal fluid?
   1. A) Glucose
   2. B) Red blood cells
   3. C) Electrolytes
   4. D) Proteins
5. What is the normal range of CSF pressure (in mm H2O)?
   1. A) 0-30
   2. B) 70-180
   3. C) 200-300
   4. D) 350-450
6. How is cerebrospinal fluid reabsorbed into the bloodstream?
   1. A) Through the lymph nodes
   2. B) Through the arachnoid villi
   3. C) Through the kidneys
   4. D) Through the liver
7. Which of the following helps maintain a stable chemical environment in the central nervous system?
   1. A) Bile
   2. B) Cerebrospinal fluid
   3. C) Gastric acid
   4. D) Sweat