Question

which of the following is not a function of csf?
to regulate the chemical environment of the nervous tissue
to protect the brain from striking the cranium when the head is jolted
to allow the brain to attain considerable size without being impaired by its own weight
to rinse metabolic wastes from the nervous tissue
to provide oxygen and nutrients to the nervous tissue

Explanation:

Analyze the functions of cerebrospinal fluid

Using the Cerebrospinal Fluid Circulation knowledge point

Cerebrospinal fluid (CSF) serves three main homeostatic functions:

1. Buoyancy: It allows the brain to float, reducing its effective weight from about 1500g to 50g, preventing it from crushing itself.
2. Protection: It acts as a shock absorber, protecting the brain from striking the cranium during sudden movements.
3. Chemical stability: It rinses metabolic wastes from the nervous tissue and regulates the chemical environment.

Identify the incorrect function

While CSF helps maintain chemical stability, it does not serve as the primary source of oxygen and nutrients for the nervous tissue. The brain's extensive blood supply (via cerebral blood vessels) directly delivers oxygen and nutrients to the nervous tissue. Therefore, providing oxygen and nutrients is not a primary function of CSF.

Answer:

• To regulate the chemical environment of the nervous tissue
• To protect the brain from striking the cranium when the head is jolted
• To allow the brain to attain considerable size without being impaired by its own weight
• To rinse metabolic wastes from the nervous tissue
• To provide oxygen and nutrients to the nervous tissue (Correct answer)