No, DBS is not a cure. It is a treatment for symptoms. It helps control the tremors, rigidity, and slowness, but it does not restore the dopamine-producing neurons in the substantia nigra. The disease continues to progress, and patients will eventually experience non-motor symptoms (like cognitive decline or autonomic dysfunction) that DBS cannot treat.
Here are the answers and explanations typically found on the Student Response Sheet for the "Deep Piece" case study on Deep Brain Stimulation (DBS). activity 2.4.2 student response sheet answers
The most common targets for Parkinson's patients are: No, DBS is not a cure
Students use a Snellen chart to determine their vision (e.g., 20/20). 20/20 means you can see at 20 feet what a person with normal vision sees at 20 feet. The disease continues to progress, and patients will
This response is based on the typical curriculum for PLTW (Project Lead The Way) Human Body Systems (HBS) Activity 2.4.2, "Deep Brain Stimulation." As educational materials vary by school and year, please use this to check your work rather than simply copying.
This test uses a Snellen eye chart to measure the clarity of vision.
Feedback loops are cycles of events in which the status of a specific body condition is monitored, evaluated, and changed. The body uses negative feedback loops to maintain homeostasis (stable internal conditions). In the context of Parkinson's, the basal ganglia (specifically the substantia nigra) is part of a feedback loop that regulates movement. It acts like a brake and accelerator for movement. In Parkinson's, the lack of dopamine disrupts this feedback loop. The brain can no longer effectively regulate the "on/off" signals for movement, resulting in the inability to start movement (bradykinesia) or stop movement (tremors).