Glycogen that is stored in skeletal muscle cells

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Question 21
Glycogen that is stored in skeletal muscle cells
is broken down and released into the blood to maintain blood glucose during exercise
can only be used by the contracting muscle itself during exercise
O is rarely used for energy (ATP) production in muscle during exercise
O two of the above are correct
Transcribed Image Text:Question 21 Glycogen that is stored in skeletal muscle cells is broken down and released into the blood to maintain blood glucose during exercise can only be used by the contracting muscle itself during exercise O is rarely used for energy (ATP) production in muscle during exercise O two of the above are correct
Energy Storage Summary
Most energy is stored as triglycerides in our adipocytes (> 15 kg,
equivalent to more than 100 000 kcal !!!!
Carbohydrate stored as:
glycogen in liver (~150 g); most concentrated as liver is only ~2 kg!
glycogen in muscle (~350 g); ~40% body mass is muscle
only about 30 g of glucose is found in the blood – not much!**
Protein also represents a large potential energy source (since
we' re about 40% muscle). This represents about 25 000 kcal,
but is obviously protected i.e. used in starvation or caloric
restriction
**
Consider a large meal at ~1000 kcal, and 60% carbohydrate – that's 150
grams of CHO! Yet your blood only holds 30 g!
Transcribed Image Text:Energy Storage Summary Most energy is stored as triglycerides in our adipocytes (> 15 kg, equivalent to more than 100 000 kcal !!!! Carbohydrate stored as: glycogen in liver (~150 g); most concentrated as liver is only ~2 kg! glycogen in muscle (~350 g); ~40% body mass is muscle only about 30 g of glucose is found in the blood – not much!** Protein also represents a large potential energy source (since we' re about 40% muscle). This represents about 25 000 kcal, but is obviously protected i.e. used in starvation or caloric restriction ** Consider a large meal at ~1000 kcal, and 60% carbohydrate – that's 150 grams of CHO! Yet your blood only holds 30 g!
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