Middle piece - structure of the sperm, Biology

Middle piece - Structure of the Sperm

Just behind the head, the small constriction (neck) carries a distal and a proximal centriole. The two lie at right angle to each other. The proximal centriole initiates the cleavage divisions of fertilized egg while the distal centriole provides attachment to axial filament of tail. The middle piece has mitochondria surrounding the base of the axial filament of the flagellum (tail). The mitochondria form compact and isolated clumps throughout the middle piece, or there may be a tightly coiled spiral of mitochondria around the proximal centriole of filament and distal centriole.

The mitochondria carry the oxidative enzymes responsible for oxidative phosphoryIation. Therefore, it is the 'power plant' supplying the energy to the flagellum to be used for propulsion of the sperm through the fluid medium. A dark ring is sometimes seen at the posterior end of the middle piece as a boundary between middle piece and the tail. It is known as 'ring centriole' but electron microscopic study reveals that the ring centriole does not resemble a centriole in its structure. Its origin and function are unknown.

Posted Date: 1/24/2013 6:23:55 AM | Location : United States

Related Discussions:- Middle piece - structure of the sperm, Assignment Help, Ask Question on Middle piece - structure of the sperm, Get Answer, Expert's Help, Middle piece - structure of the sperm Discussions

Write discussion on Middle piece - structure of the sperm
Your posts are moderated
Related Questions
Day-Neutral Plants  Besides SDP and LDP, those plants that flower irrespective of the length of light are called day-neutral plants. For these there is no specific requirement

Acetylcholine, a well known neurotransmitter, plays a critical synaptic role in the initial formation of memory. Chemical blockage of the acetylcholine receptors makes it harder to

Molybdenum and Vanadium - Inorganic Nitrogen and Sulphur Metabolism Molybdenum must be available in nature in order to meet the demand of Mo for the formation of nitrogenase n

Define interaction of vitamin c with Pyridoxine? Pyridoxine is involved in glyconeogenesis through its action in transaminase reactions. Low levels of pyridoxine impair glucose

A haem British English or heme American English is a prosthetic group which having of an iron ion contained in the middle of a huge heterocyclic organic ring called as a porphyrin.

The article entitled "Life on Earth" is trying to make the point that RNA likely included before DNA. Forthis article which of the following is false? A. Chains of RNA nucleoti

What is the significance of torsion? An unusual twisting of the gastropod body which has left all members of class with an asymmetric body plan and a U-shaped alimentary tract,

Neuron A is a healthy neuron with all the usual ion channels.  When at rest with a membrane voltage of R millivolts, neuron A produces no action potentials.  The voltage thres

Explain the term - Muscle Contraction Headache This is one of the most common headaches. It is also known as tension or nervous headaches. They result from sustained contractio

What is the formula of the DPD for withered (shrank) plant cells? How is that situation possible? Ans) Withered plant cells are those that shrank because of loss of water by eva