Fertilization is the union of male(sperm) and female(oocyte) gametes to form a zygote and marks the beginning of the pregnancy. Embryonic life begins with fertilization. Fertilization process require 24 hours. During this lesson we need to discuss about Ovulation Getting the spermatozoa ready Key steps of fertilization The formation of the zygote Abnormal Fertilization Ovulation […]

Cell Cycle

A cell cycle is a series of events that takes place in a cell as it grows and divides. A cell spends most of its time in what is called interphase, and during this time it grows, replicates its chromosomes, and prepares for cell division. The cell then leaves interphase, undergoes mitosis, and completes its […]

Muscle Contraction

The sequence of events that result in the contraction of an individual muscle fibre begins with a signal—the neurotransmitter, ACh—from the motor neuron innervating that fibre. The local membrane of the fibre will depolarize as positively charged sodium ions (Na+) enter, triggering an action potential that spreads to the rest of the membrane will depolarize, […]


The ability of eukaryotic cells to adopt a variety of shapes, organize many compartments in the interior, interact mechanically with the environment and carry out coordinated movement depends on cytoskeleton. The cytoskeleton is a network of fibers forming the “infrastructure” of eukaryotic cells, prokaryotic cells, and archaeans. In eukaryotic cells, these fibers consist of a complex mesh of protein filaments […]


Gametogenesis is the production of gametes from haploid precursor cells. In animals and higher plants, two morphologically distinct types of gametes are produced (male and female) via distinct differentiation programs. Animals produce a tissue that is dedicated to forming gametes, called the germ line. Now we are going to learn about the, The Germ Line Sexual […]

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