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relation of water content to functionsif an aquatic plant appearing turgid is removed from water and left in the open it quickly wilts the water
plant waterrole of water in plants you know that water is the main constituent of plant cells it performs the following major functionswater as a
pheromones serving functions other than reproductionbesides sexual responses as described above pheromones mediate several other types of behaviour
neural basis of responses to sex pheromonesthe ability of insects to detect and discriminate between a variety of pheromones with great sensitivity
pituitarythe pituitary is also known as hypophysis it is composed of two embryologically distinct tissue the anterior pituitary or adenohypophysis is
action of hormoneswe said earlier that hormones are released into the blood stream or extracellular fluid and therefore reach most of the cells of
secretion of hormonesthe secretion of most hormones except steroid is by the process of exocytosis figure summarises the formation transport release
synthesis and storage of hormonethe synthesis and storage of hormone depends on the nature of the hormone steroid hormones are secreted in diffuse
types of neural networksneural networks can be grouped into sensory filter networks that are organised so as to pass on only certain features of a
properties and functions of synapsesthere is an interval between depolarisation of the presynaptic terminal and the earliest appearance of a
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