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conduction in myelinated axonsthe myelin sheath provides insulation for the axon preventing movements of na and k through the membrane therefore if
conductionan action potential occurs at one point along the axon yet we know that neurological impulses are not fixed they travel along a neuron so
all or none responsea very weak stimulus does not result in an action potential the stimulus must have a certain strength to evoke an excitation this
normal 0 false false false en-in x-none x-none
neurotransmitterswe know that transmission of signals from nerves to muscles is affected by acetylcholine a transmitter substance similarly
synapse nervous system structural feature of unique importance in the nervous tissue is the synapse a synapse is the anatomical site at which
types of axonsaxons are of two types myelinated and non-myelinatedin the case of myelinated axons the neurilemma is ensheathed by another covering
neurons - nervous systemalthough neurons occur in a great variety of sizes and morphological forms they have a basic plan of structure representing
contraceptive pill - reproductionabout sixty million women in the world are currently using oral steroid contraceptives these contraceptives usually
phases of menstrual cycle - reproductionfour phases of the menstrual cycle are usually distinguished the menstrual proliferative follicular ovulatory
menstrual cycle- reproductionmenstrual cycles are characteristic of primates and do not occur in other vertebrate groups the length of the cycle is
endocrine regulation of the cycle - reproductionyou have learnt above that the reproductive cycles are governed by the interplay of pituitary and
proestrus - estrous cyclethis precedes the next heat and is characterised by functional involution of the corpora lutea and preovulatory swelling of
diestrus- estrous cyclethis lasts 60 to 70 hours during which functional regression of the corpora lutea occurs the uteri are small anaemic and only
metestrus - estrous cyclethis occurs shortly after ovulation and is intermediate between estrus and diestrus the period lasts for 10 to 14 hours and
estrus - estrous cyclethis is the period of heat and copulation is permitted only at this time this condition lasts from 9 to 15 hours and is
normal 0 false false false en-in x-none x-none microsoftinternetexplorer4
types of ovarian cycles in mammalsmammals exhibit two types of ovarian cycles estrous cycle exhibited by non-primates such as rats cats dogs pigs and
phases of ovarian cyclein non-mammalian vertebrates the ovarian cycle consists of the following phase pre breeding phase breeding phase and post
functions of testisthe testis performs the following two functions proliferation of spermatozoa and secretion of steroid hormones