Question

True or False:

T or F -  Local potentials are non-reversible.

T or F - Most brain tumors are comprised of glial cells.

T or F -  Decision making neurons are often characterized as interneurons.

T or F -  The phrenic nerve innervates the diaphragm.

T or F -  Parkinson’s disease occurs with dopamine deficiency in the substantia nigra and basal nuclei.

T or F - Astrocytes manufacture cerebrospinal fluid.

T or F - Microglia are macrophages of the brain.

T or F - An inhibitory postsynaptic potential assures that the postsynaptic cell will reach threshold.

T or F - A diverging neural circuit is described as many presynaptic neurons synapsing on to one postsynaptic neuron.

T or F - Long-term memory involves the physical re-modeling of synapses.

Answer 1

False

Local potentials are reversible which means that when stimulation stops the potassium ions diffuses out of the cells which returns the membrane voltage to resting potential.

True

Gliomas which arises from glial cells are the main contributor of brain tumors.

True.

Phrenic nerve innervates diaphragm. It originates from cranial nerve and helps in the movement of diaphragm during breathing.

True

Nerve cells in basal ganglia and the substantia nigra of the brain produce the neurotransmitter dopamine which is responsible for relaying messages and controls the body movement. In Parkinson's disease the degeneration of substantia nigra takes place due to which production of dopamine gets reduced.

False.

Cerebrospinal fluid is produced by Choroid plexus. Astrocytes provides nutrients to neurons and control the blood brain barrier.

True

Microglia are the neuroglial cells found in brain which acts as macrophages and play role in active immune defence.