Coming to Berkeley as a freshman, I wanted to change my lifestyle and decided to start weight lifting, in particular bicep curling. I would never have realized the little intricacies involved in bicep curling without Psychology 1. Just the actual motion of bicep curling is so complex that I got really fascinated in the neuroscience behind life.
In fact, my arm and brain are linked together by countless nuclei and nerves. It is fascinating that the muscles that I focus on will have a greater concentration of neurons than someone who focuses on other regions of the body. Nuclei are bundles of neurons that span the brain and nerves are bundles of neurons that span the rest of the body. At the cellular level, neurons from the Central Nervous System send out signals to subsequent neurons and then to the Peripheral Nervous System. From there, muscle cells are signaled, which eventually allows your arms to curl dumbbells, contract, and relax.
Neurons communicate with each other by releasing neurotransmitters into the synaptic cleft to interact with receptors on subsequent neurons, in order to promote or stop a signal. Dendrites on neurons receive messages from presynaptic neurons and axons push messages towards postsynaptic neurons. These axons are normally negatively charged at resting potential, while the outside environment is positively charged. Neurons would pass on action potentials with the messages from the Central Nervous System to the Peripheral Nervous System, and then the messages would be sent into neuromuscular junctions in the arms and hands. To activate these action potentials, sodium ions would flow inwards into the neurons and potassium ions would flow out of the neurons by ion channels, which would cause a sufficien...
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...e presynaptic cell into the synaptic cleft. From this point, there can be further activation or deactivation for the propagation of the message because the neurotransmitter can activate or inhibit ion channels in the postsynaptic cell. Pre-work out stimulants actually allow these neurotransmitters to remain in the synaptic cleft for a longer period, which allows greater chances of interaction with the postsynaptic channels, but also delays and decreases the reabsorption of these neurotransmitters by the presynaptic cell. Therefore, stimulants can lead to a crash once the effect of the drug wears off. I have found that the connections between neuroscience and daily activities are very applicable to normal every day life because in every daily activity there is an intricate system of processes occurring at various chemical, cellular, tissue, organ, and system levels.
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