As a medium for excretion of waste product

The correct Answer is:A

To determine which function is not performed by cerebrospinal fluid (CSF), we first need to lớn understand the actual functions of CSF. Here’s a step-by-step breakdown of the solution:

Step 1: Identify the Functions of Cerebrospinal Fluid (CSF)
CSF has several important functions, including:
- Protection: It acts as a cushion for the brain and spinal cord, protecting them from trauma and shock.
- Nutrient Supply: CSF supplies essential nutrients to lớn the nervous system tissues.
- Waste Removal: It helps in removing waste products from cerebral metabolism.
- Buoyancy: CSF provides buoyancy to lớn the brain, reducing its effective weight and preventing damage from its own weight.

Step 2: Analyze the Options Given
Now, let’s analyze the options provided in the question:
1. Protects the brain and spinal cord from antibodies.
2. Delicate brain and spinal cord are protected from shock and trauma.
3. It is a medium for excretion of waste products.
4. Provides buoyancy to lớn the brain.

Step 3: Determine Which Option is Incorrect
- Option 1 states that CSF protects the brain and spinal cord from antibodies. This is not a function of CSF. CSF does not contain antibodies that would provide protection; instead, it serves to lớn cushion and tư vấn the brain and spinal cord.
- Option 2 correctly states that CSF protects the brain and spinal cord from shock and trauma.
- Option 3 correctly identifies CSF as a medium for excretion of waste products.
- Option 4 correctly states that CSF provides buoyancy to lớn the brain.

Conclusion
Based on the analysis, the function that cerebrospinal fluid does not include is:
Option 1: Protects the brain and spinal cord from antibodies.