[Solved] Use the method of cylindrical shells to find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the indicated axis. Sketch the region and a representative rectangle. \(y = \sqrt { 16 - x ^ { 2 } } , y = - x + 4 ;\) the \(y\)-axis Inhibitory: Referring to a process that decreases the likelihood of a neuron firing and transmitting its signal to other neurons. Excitatory: Pertaining to or causing excitation, often referring to neurotransmitters or synaptic inputs that increase the likelihood of a neuron firing an action potential. Parkinson's Disease: A neurodegenerative disorder that affects movement, causing symptoms such as tremors, stiffness, and slowness of movement. Dopamine: A neurotransmitter involved in many functions, including mood, sleep, learning, and the reward system, influencing both movement and emotional responses.