Create a model in the space below that demonstrates how neurotransmitters are released and act upon target cells. Start off by placing the items provided in the word bank into boxes. Upon filling in the boxes with the appropriate terms, represent the physiological relationships between the its by drawing in arrows between the terms. Finally, label the arrows to describe the relationship. An example is provided to help you get started. Stimulate/ Word Bank
initiates
Term A Term B
Vesicles filled with neurotransmitter
Axon terminal end membrane
Excitatory post synaptic potential
lonotropic receptor on post synaptic cell
Vesicle proteins
Ca2+ voltage gated channels
Action potential
Axon terminal end
Ca2+
Neurotransmitter
Synaptic cleft
Na+
Post synaptic cell .

1. Oxygen

2. Combustion

Explanation:

Cyanobacteria are known as the first photosynthetic organism on Earth. They used H2O instead of H2S to fix carbon dioxide into energy-rich molecules such as glucose. The process, therefore, produced a tremendous amount of oxygen (99% of total oxygen), which was then released from oceans to Earth's atmosphere.

We know that oxygen is an oxidizer that helps in burning (combustion). When the oxygen started accumulating in the atmosphere, oxidation of many compounds started occurring, e.g. iron oxidation. Water was already available at that time. Photosynthesis also existed because cyanobacteria produced oxygen through photosynthesis. Thus the presence of oxygen didn't influence photosynthesis. In fact, the presence of oxygen, due to oxidation processes, leads to the formation of complex life processes that we see today. Previously, earth atmosphere was mostly reduced because of very limited availability of other oxidizers.