Together organ systems make us healthy and living.
<h2>Medicinal chemistry refers to a stimulating branch as it associates various scientific disciplines and permits for collaboration with other scientists.</h2><h2>in developing and researching novel drugs. The medicinal chemists utilize their chemistry training to the procedure of producing new pharmaceuticals. </h2><h2>the assignments of Dorothy is to formulate and develop new medicines, so that it can be later sold in the market. </h2>
Answer:
<u>acetylcholine</u>
Explanation:
In the pre-synaptic knob there are vesicles which contain a transmitter substance called acetylcholine. When an impulse reaches the synaptic knob, it stimulates the vesicles to move towards the pre-synaptic membrane releasing the acetylcholine.
The transmitter substance makes the membrane permeable. The neuromuscular junction contains the sensory neurone(afferent), motor neurones(efferent) and the relay neurones(connector).
I believe it’s B or D sorry I’m not 100% sure
B) Oxygen may not have been able to accumulate in the atmosphere
