Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Events prior to the Sperm-Egg Fusion
In a number of organisms that have been studied, the sperm remain immotile in the testis or in the semen. The sperm become active and motile when they are close to the eggs. Several factors have been attributed for the activation of the sperm which include pH, oxygen tension, presence of certain ions etc. Detailed studies in sea urchin have shown a change in the pH as the cause for the activation of the sperm. In mammals the definite cause of activation is not known and it is presumed that sperm motility begins with the ejaculation of the semen into the female reproductive tract. Activation of the sperm does not ensure that the sperm will meet the egg. In instances where fertilization occurs outside the organism, i.e. external fertilization, chemotactic mechanisms have been evolved to attract the sperm towards the egg. In fish eggs substances found near the micropyle attract the sperm. The substances found near the micropyle make the sperm to move rapidly to the vicinity of the egg.
Assessment While assessing the patient with rheumatic fever, a detailed history including, problematic environmental factors or recent exposure to streptococcal infection is
GER M LAYER THEORY - Proposed by Pander, studied chick embryo development. Coined the term ectoderm, mesoderm & endoderm.
Formation of Notochord and Somites The formation of notochord and somites from the transplanted dorsal lip was supposed; these are normally derived from cells of the dorsal li
Of which type of tissue are cartilages and bones made? Are the cells of the connective tissue far or near to the others? The relative great spacing among cells is a typical
How does a person with drown syndrome obtain a third chromosome 21?
What best describes the amoebas division? (1) It is a Mode of asexual account in which a one parent is involved. The amoeba cell, which is unicellular, separates into two daug
What is the name of the DNA duplication process? What is the main enzyme that participates in it? The process of copying, or duplication, of the DNA molecule is called replica
Microtubule assembly: A) generally originates in the centrosome. B) Occurs only during mitosis. C) Occurs randomly throughout the cell. D) Is regulated by myosin. E) Is inhibited d
what is the Symptoms of VIBRIO PARAHAEMOLYTICUS Symptoms: A total of greater than one million organisms may cause disease. Symptoms of intoxication which range from mild to se
Define Classification of Carbohydrates - Monosaccharide? Monosaccharides or simple sugars are those carbohydrates that cannot be hydrolyzed into simpler carbohydrates. E.g. gl
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd