Tail - Structure of the Sperm The tail or flagellum is the longest part of the sperm. By its movement it causes the sperm to swim with the head forward. It consists of a thin layer of cytoplasm surrounded by plasmalemma. The axial filament is the main part of the tail or flagellum. Its structure is essentially similar to a typical flagellum or cilium with the arrangement of 9 peripheral pairs and one central pair of longitudinal fibers. The major portion of the flagellum is called 'axoneme'. An axoneme is formed by the microtubules emerging out of the centriole at the base of sperm nucleus. The core of the axoneme consists of two central microtubules surrounded by a row of nine doublet microtubules. In fact, only one microtubule is complete having thirteen protofilaments; the other is C-shaped having only eleven protofilaments.  The protofilaments are exclusively made of the dimeric protein-tubulin. Another protein dynein is attached to microtubule. The dynein is capable of hydrolysing ATP molecule and can convert chemical energy into mechanical energy that propels the sperm. Posted Date: 1/24/2013 6:24:22 AM | Location : United States

Ask an Expert

Your posts are moderated

Write your message here..

Related Questions

How are the fruits formed, How are the fruits formed? The fecundation i... How are the fruits formed? The fecundation is in angiosperms triggers the release of hormones that act upon the ovaries. The ovary wall after that it develops into a fruit that

What are the main sources of mercury pollution, Q. What are the environment... Q. What are the environmental harms caused by mercury pollution? What are the main sources of mercury pollution? The Mercury is a metal that when present in the water of rivers

Food pyramid concept, Dietary counseling based on the food pyramid concept ... Dietary counseling based on the food pyramid concept and the food to target concept will be quite useful in the management of the disease. The optimal age for discontinuing the

Genomic dna from the sea urchin, Eric Davidson isolated and compared the se... Eric Davidson isolated and compared the sequences of mRNA transcripts and genomic DNA from the sea urchin. Which of the following is a true statement regarding his findings? A.

Requirements of various nutrients in constipation, Q. Requirements of vario... Q. Requirements of various nutrients in constipation? The requirements of various nutrients are not altered in constipation. It is essentially a normal balanced diet (normal RD

Tools of lower paieolithic age, Tools of lower paieolithic age Pleistoc... Tools of lower paieolithic age Pleistocene times there were huge herds of very large mammals. Bones of such large mammals were found associated with the human fossil finds and

Properties of fatty acid, A fatty acid having of a hydrocarbon chain and a ... A fatty acid having of a hydrocarbon chain and a terminal carboxylic acid group that is shown in the figure.  Most  fatty  acids  are  in  biology  have  an  even  number  of carbo

Somatoform disorders, SOMATOFORM DISORDERS: The term 'Neurosis'  was f... SOMATOFORM DISORDERS: The term 'Neurosis'  was first introduced in 1769 by William Cullen (1710-  1790). Till later part of nineteenth century, anxiety disorders were conspicu

Neuropsychological screening of adults, Neuropsychological screening of adu... Neuropsychological screening of adults Normally, a neuropsychological examination explores in depth an individual's performance in a wide range of functional domains. There are

Differentiate between a dossier and a submission document, Problem 1: H... Problem 1: How do you differentiate between a dossier and a submission document? Define dossier Define submission document differentiate between a dossier and a