1. One of the muscles is comprised mainly of slow twitch myocytes and the other

ID: 34760 • Letter: 1

Question

1. One of the muscles is comprised mainly of slow twitch myocytes and the other of fast twitch fibers. Which one has the fast twitch cell

(a). Muscle x

(b). Muscle y

2. For both muscles calculate maximum isometric force (Fo) normalized to muscle cross-sectional area

(A).X = 228 kN/m2 , Y= 456 kN/m2

(B).X = 200 kN/m2 , Y= 188 kN/m2

(C).X = 428.7 kN/m2 , Y= 146.7 kN/m2

(D).X = 228 kN/m2 , Y= 25.3 kN/m2

(E). not enough info provided

3.The one true statement about vertebrate slow and fast muscle below provides a likely explanation for the correct answer to Question #2

(A).Slow and fast muscles have similar myofibrillar volume densities

(B).Fast muscle generally has greater intracellular lipid content than slow muscle

(C).Slow muscle has more SR volume density compared to fast muscle

(D).Fast muscle has higher mitochondrial volume density than slow musc

1. One of the muscles is comprised mainly of slow twitch myocytes and the other of fast twitch fibers. Which one has the fast twitch cell

Answer (b). Muscle y

2. For both muscles calculate maximum isometric force (Fo) normalized to muscle cross-sectional area

Answer (C).X = 428.7 kN/m2 , Y= 146.7 kN/m2

3.The one true statement about vertebrate slow and fast muscle below provides a likely explanation for the correct answer to Question #2

Answer (B).Fast muscle generally has greater intracellular lipid content than slow muscle

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