Question

Match the following columns.

Column 1	Column 2
Neurotransmitter	Myelinated sheath
Insulating sheath	Acetylcholine
Nodes of Ranvier	Neurolemma
Neurofibrils	Cyton

Answer 1

A. Neurotransmitter II. Acetylcholine

1. Neurotransmitters are the chemical messengers produced by the nerve cells.
2. These are the molecules used by the nervous system to relay information between nerve cells, or from nerve cells to muscles.
3. The seven main neurotransmitters are dopamine, acetylcholine, gamma-aminobutyric acid (GABA), histamine, glutamate, serotonin, and norepinephrine.

B. Insulating sheath III. Neurolemma

1. Neurolemma is a thin insulating sheath also known as Schwann's sheath which covers the neural axon.
2. It makes up the outermost layer of the nerve fiber in the peripheral nervous system.

C. Nodes of Ranvier I. Myelinated sheath

1. The node of Ranvier is a gap in the myelinated sheath on the axons of some neurons that facilitate the rapid conduction of nerve impulses.
2. Their function is to accelerate the propagation of action potentials along the axon through salt conduction.

D. Neurofibrils IV. Cyton

1. Cyton (cell body of a neuron) consists of a central nucleus which is abundant in cytoplasm, also called neuroplasm.
2. Neurofibril is a fine proteinaceous fibril that is present in neuroplasm and it conducts excitation.

Column I	Column II
A. Neurotransmitter	II. Acetylcholine
B. Insulating sheath	III. Neurolemma
C. Nodes of Ranvier	I. Myelinated sheath
D. Neurofibrils	IV. Cyton