Which of the Following Is True with Regard to Geographic

question 10

Multiple Choice

Which of the following is true with regard to geographic distribution and MS?

• A)The highest frequency of MS occurs in areas of the southern United States and Europe and Northern Australia.
• B)The highest frequency of MS occurs in areas of the northern United States and Europe,Scandinavian countries and southern Australia.
• C)The highest frequency of MS occurs in tropical areas of Asia,Africa,and South America.
• D)Geographical location does not affect frequency of MS.

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Definitions:

Tropomyosin

A protein found in muscle tissue that regulates muscle contraction by blocking or exposing binding sites for myosin on actin filaments.

Troponin

A protein complex involved in muscle contraction; found in cardiac and skeletal muscles, its levels in the blood are used as a diagnostic indicator for heart attacks.

Sarcomere Distance

The length between two Z lines in a muscle fiber, defining the fundamental unit of muscle contraction.

Muscle Twitch

Single contraction of a muscle fiber; typically lasts only a fraction of a second.