23. In the central nervous system, ______________ take up glutamate from the syn

Question

23. In the central nervous system, ______________ take up glutamate from the synaptic cleft and inactivate it by converting it to glutamine before releasing it into the extracellular space to be taken up by _________________, which convert it back to glutamate and _______________.

a. astrocytes, neurons, package it in vesicles for release

b. astrocytes, neurons, release it from the cytoplasm

c. neurons, astrocytes, package it in vesicles for release

d. oligodendrocytes, neurons, release it from the cytoplasm

e. oligodendroyctes, neurons, package it in vesicles for release

24. Except for the sense of smell (olfaction), which has a direct pathway to the olfactory cortex of the cerebrum, all other sensory systems are characterized by clusters of neuronal input regions in the:

a. spinal cord gray matter b. brain stem

c. thalamus

d. cerebrum

e. dorsal horn

25. Proteins are transported via axoplasmic transport at slow rates (0.5 to 2 mm per day) and fast rates (200 to 400 mm per day). The difference in transport rate results from:

a. the motor protein used to transport the proteins

b. the substrate molecule used by the motor protein

c. the proportion of time that the proteins spends in transport by kinesin on microtubules.

d. the site where the protein is synthesized.

e. a and b are correct.

26. The proteins that travel in the fast component of axoplasmic transport at between 200 and 400 millimeters per day are:

a. packaged in vesicles.

b. cytoplasmic proteins.

c. transported by the molecular motor kinesin.

d. synthesized on free ribosomes.

e. a and c are correct.

Explanation / Answer

23) a

These are steps in Glutamate-Glutamine cycle in CNS

Glutamate released in synaptic cleft from neuron.It gets converted to glutamine by astrocyte(Excitatory Amino Acid Transporter).Its then taken into neuron,where it convert back to glutamate and is packed in vessicle for release

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