Cerebrospinal fluid is formed by filtration of blood in the:
central canal.
choroid plexuses.
subarachnoid space.
arachnoid villi.
The Correct Answer is B
A. central canal: This is the space in the center of the spinal cord through which CSF flows, but it is not the primary site of formation.
B. choroid plexuses: These are networks of capillaries found in the ventricles of the brain specifically designed to filter blood and produce CSF.
C. subarachnoid space: This is the area where CSF circulates around the brain and spinal cord.
D. arachnoid villi: These are responsible for the reabsorption of CSF back into the blood, not its formation.
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Related Questions
Correct Answer is C
Explanation
A. repolarization: This refers to the phase where a neuron returns to its resting state after firing.
B. refraction: In biology, this refers to the period during which a nerve cannot fire again (refractory period).
C. saltatory conduction: This is the correct term for an impulse "jumping" from one Node of Ranvier to the next along a myelinated axon, which significantly increases signal speed.
D. diffusion: This is the passive movement of molecules and does not describe the electrical leaping of a nerve impulse.
Correct Answer is B
Explanation
A. Viruses: Viruses are the simplest pathogens, consisting only of genetic material and a protein coat.
B. Tapeworms: These are the most complex because they are multicellular animals (helminths) with specialized organ systems for reproduction and attachment.
C. Bacteria: These are single-celled prokaryotic organisms, which are more complex than viruses but less complex than multicellular animals.
D. Protozoa: These are single-celled eukaryotic organisms; while complex for a single cell, they lack the tissue and organ complexity of a worm.
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