Discussion
Slow twitch muscle fibers are characterised by :
(I) Greater cross-sectional area
(II) Greater Kreb cycle enzymatic capacity
(III) Low nerve conduction velocity
(IV) Greater glycolytic capacity
Select the right combination :
Answer: C
Slow twitch fibres have (II) and (III): greater Krebs cycle enzyme capacity and lower nerve conduction velocity.
Slow twitch (type I) fibres are built for endurance. They have many mitochondria, much myoglobin and a high activity of the oxidative enzymes of the Krebs cycle (II). They are supplied by small motor neurons whose axons conduct impulses more slowly (III).
A greater cross-sectional area (I) and a greater glycolytic capacity (IV) are features of fast twitch (type II) fibres, which are designed for fast, powerful, anaerobic work. Every code that includes (I) or (IV) is therefore wrong.
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