Principles of Human Physiology Study Set 1
Quiz 7 :
Nerve Cells and Electrical Signaling
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Q01 Q01 Q01
The depolarization of the membrane due to a stimulus is a regenerative mechanism meaning that, once sodium gates begin to open, even more sodium gates will be activated leading to a larger inflow of sodium ions and more depolarization until it is terminated when sodium gates close. This is an example of
Q117 Q117 Q117
Graded potentials develop in the cell body of neurons as well as in sensory receptor cells. In order for sensory information to reach the central nervous system that graded potential must be converted into an action potential. How are graded potentials created, and how are they different from action potentials?
Q121 Q121 Q121
Amyotrophic lateral sclerosis (ALS), often referred to as "Lou Gehrig's Disease," is a progressive neurodegenerative disease that affects the efferent division, particularly the motor neurons, of the nervous system. People with ALS have normal bodily functions and their ability to think, form memories, and to detect sensations is all normal. However, the progressive nature of this disease can lead to total paralysis. Based on your knowledge of the different divisions of the nervous system and the functioning of neurons, explain the symptoms of ALS.