The results of brain scan showed no evidence of a tumor. Kevin was relieved, but there was still no answer for his symptoms. The doctor suspected multiple sclerosis, so he ordered a nerve conduction study of Kevin’s left arm and leg to look for abnormal action potential rates.   Multiple sclerosis is a demyelinating disease, where the myelin in motor neurons breaks down over time. Where is myelin found in motor neurons? What is its function in those neurons? Finally, hypothesize why a breakdown of myelin would cause Kevin’s shaking.

Sending signals from the body to the correct part of the cerbrum is the job of the ____________.

The lens does NOT have any direct blood supply. Instead it receives nutrients from blood vessels in the _______.

An individual that has red-green color blindness cannot distinguish colors in the red to green spectrum. This is due to an issue in the _______.

The portion of a neuron that transmits action potentials is the  ______.

Cataracts cause cloudy or blurry vision due to clouding the organ that focuses light to effectively change its shape. This issue affects the _________.

Medical conditions that result in abnormal muscle activity such as Parkinson’s disease and ADHD are associated with the ______ that regulates movement.

The remainder of the questions require you to use information from the case study below and the lecture videos to be able to answer them. Make sure to answer all parts of each question.  Case Study Kevin is a 45 year old lab technician who works for a major biotechnology company. Over the last few months Kevin noticed that his hands had begun shaking when he was pipetting chemicals or plating bacteria. He went to see his doctor who asked a series of questions and conducted some tests. He noticed that Kevin’s left foot dragged a little when he walked and that he had less strength in his left hand than the right, as well as the shaking. Kevin also told the doctor that he would experience periods where his left arm would shake uncontrollably. The doctor explained that there were a series of possibilities, including a brain tumor, multiple sclerosis (MS), and Parkinson’s disease (PD). All of them could result in abnormal motor neuron function. The doctor wanted to rule out the most serious first, so he sent Kevin for a brain scan to look for the presence of a tumor.    Describe the process of action potential formation at the cellular level. Make sure to define or describe what is happening at resting potential, overshoot, repolarization, depolarization, and threshold.

The _______________ is associated with the endocrine system.

Which of these is involved in establishing a resting membrane potential?