One, two, and four. Hope this helps!
Answer: c.initiation of some nerve impulses
Explanation:
Cerebrospinal fluid is a clear, colorless fluid that can be found in the brain and spinal cord. It is secreted by meninges and choroid plexus. It is absorbed by the arachnoid granulations.
The primary function of the CSF is to act as a cushion to the brain within the skull to serve as a shock absorber and prevents the injury from the blow. It also circulates the chemicals and nutrients filtered from the nerves and also removes the waste from the brain produced by the cerebral metabolism hence reduces the wastes from the brain.
The cerebrospinal fluid does not function in the initiation of the nerve impulses.
Answer:
Option A) Protein carrier
Explanation:
The carrier proteins are those proteins that are involved in transfer of substances from one side to other side through plasma membrane. These are present in chloroplast, mitochondria and nucleolus.
The lipid carriers increases the absorption and solubility. These allows the transfer of non-polar molecules. The lipid carriers are used in drug delivery systems. So, this is an incorrect option.
The Porin carriers are present in the membrane of the bacteria. It allows the passive diffusion of molecules due to its large size. It only allows movement of hydrophillic substances.
The Polar molecules and ions moves across the biological membrane with the help of protein carrier. Thus, option A is correct.
The answer is D)
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