Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Active Tutors
Asked Questions
Answered Questions
insects - hormones in growth and reproductionin insects hormones regulate moulting and metamorphosis the larvae or nymphs which hatch out of the eggs
crustaceans - hormones in growth and reproductionarthropods have a tough and frequently hard exoskeleton made up of cuticle composed of chitin and
molluscus - hormones in growth and reproductionwe know quite well about the endocrine mechanism of growth and reproduction in the freshwater snail
annelids - hormones in growth and reproductionstudies on polychaetes have displayed that the endocrine glands play a key role in growth and
corpus cardiacum - endocrine organswe before mentioned that corpus cardiacum pl corpora cardiaca is a neurohemal organ in insects it is gland of
neurosecretory cells and neurosecretionwe have before said that the neurosecretory cells are an important component of the non- chordate endocrine
endocrine versus neural integration a question that surely comes across your mind is what is the need for two types of integrative mechanisms the
endocrine system the nervous system brings about integration and co-ordination of several activities of the animal the afferent stimuli from several
photoreceptorsphotoreceptors are concerned in absorption of light by photosensitive pigments the chemical change involved produces the impulse
chemoreceptorsthese are receptors included in perception of chemical stimuli you will see that there are three kinds of chemoreceptors among
stretch receptorsstretch receptors able of perception of muscle tension or stretch are distributed in the connective tissue related with muscles of
giant nerve fibres we now know that giant nerve fibres take place in the central nervous system of many polychaetes oligochaetes insects cephalopod
information processing in sensory neuronyou have previously seen that the sensory neuron transmits the information it receives as an action potential
properties of receptorsthe receptors collect information concerning the change in the environment such as temperature illumination etc in lower
motor control in annelids and arthropodsin annelids and arthropods generally individual metameric ganglia of the ventral nerve cord are capable of
advanced nervous systems - general trend in evolution in higher groups of animals you will observe clear trends towards centralisation of the nervous
nervous system of echinodermsprevious to studying the nervous system of echinoderms you have to bear in mind the peculiar organization of these
primitive nervous system - nerve neta nervous system creates its appearance for the first time in the phylogeny among cnidaria in this group the
organisation of nervous system nervous systems are composed of nerve cells or neurons and glial cells in the latter half of the 19th century it was
nerve cell - the basic unit the basic unit of the nervous system is the nerve cell or neuron a neuron is to the nervous system what a brick is to the
nervous system and sense organsthe non-chordates also perform a variety of activities such as feeding digestion locomotion etc for this aim they have
closed type of circulatory systemssome non-chordates like cephalopods octopuses squids earthworms polychactes and all vertebrates have a closed
circulatory systemcoelenterates and platyhelminths nutrients in sponges respiratory gases and waste materials can easily diffuse through the
open and closed type of circulatory systems there are two categories of circulatory system found in higher metazoans in one type the original
chlorocruorins - respiratory pigmentsthese types of respiratory pigments are found in four polychaete families sabellidae serpulidae ampharetidae and