Question

Why is it difficult to identify the cause of many nervous system disorders? a. The genes associated with the diseases are not known. b. There are no obvious defects in brain structure. c. The onset and display of symptoms varies between patients. d. all of the above

Name: Problem 22, Chapter 35: Biology
Uploaded: 2020-06-24T18:03:10-08:00
Duration: 2 min 35 s
Channel: Rikhil Makwana
Description: Why is it difficult to identify the cause of many nervous system disorders? a. The genes associated with the diseases are not known. b. There are no obvious defects in brain structure. c. The onset and display of symptoms varies between patients. d. all of the above

   Why is it difficult to identify the cause of many nervous system disorders?
a. The genes associated with the diseases are
not known.
b. There are no obvious defects in brain structure.
c. The onset and display of symptoms varies between patients.
d. all of the above

Biology

Mary Ann Clark, Jung… 2nd Edition

Chapter 35, Problem 22

Instant Answer

Solved by Expert Rikhil Makwana

06/24/2020

Step 1

It is divided into two main parts: the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS includes the brain and spinal cord, while the PNS includes all other neural elements. Show more…

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Why is it difficult to identify the cause of many nervous system disorders? a. The genes associated with the diseases are not known. b. There are no obvious defects in brain structure. c. The onset and display of symptoms varies between patients. d. all of the above

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Key Concepts

Genetic Complexity

This concept involves the idea that many nervous system disorders are influenced by multiple genes, and the specific genes that may contribute to a disorder are often not clearly identified. The uncertainty in genetic contributions makes it challenging to pinpoint their exact role in these diseases.

Structural Normalcy of the Brain

In many cases, nervous system disorders do not manifest with obvious structural defects in the brain when examined using typical imaging techniques. This absence of clear anatomical anomalies complicates the process of linking physical abnormalities to functional symptoms.

Phenotypic Variability

This refers to the wide range of symptom onset and clinical presentations among individuals with the same nervous system disorder. Variability in how and when symptoms appear contributes to difficulties in establishing a consistent cause and in diagnosing the disorders accurately.

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