Figure 10.

Hypothec diagrams of microtubule sliding generating the hyperactivated flagellar movement. A: The microtubule sliding generating the asymmetrical hyperactivated flagellar movement at a high Ca²⁺ concentration. A large loop of a thick fiber group of the doublet microtubules, which may be composed of Nos. 4–7 doublet microtubules, is formed by a long synchronous sliding of No. 7 doublet microtubules. B: The microtubule sliding generating the symmetrical hyperactivated flagellar movement at low Ca²⁺ and high cAMP concentrations. Small loops of thin fiber groups of the doublet microtubules are formed by small number of the doublet microtubules, which independently slide between nine doublet microtubules. The numbers in the circles indicate the number of the doublet microtubules according to Afzelius.²⁶⁾ The numbers indicate the sliding of corresponding doublet microtubules.