Many animals rely on tactile (pertaining to touch) stimuli to obtain information about their environment. Mechanical sensory receptors in vertebrate skin detect stimuli that the brain interprets as light touch,…
PHYLUM NEMATODA (nemtuos, thread) Nematodes are roundworms. They are some of the most abundant animals on earth. Number or round worm species is from 16, 000 to 500,000. There are…
Structure of human ear The human ear has three divisions: the outer, middle, and inner ear. The outer ear consists of the auricle and external auditory canal. The middle ear…
The ears of anurans (frogs) consist of a tympanum, a middle ear and an inner ear. The tympanum vibrates in response to sound waves and transmits these movements to the…
Hearing may initially have been important to vertebrates as a mechanism to alert them of any dangerous activity around them. It also became important in the search for food and…
The eyes of cephalopods (squids, such as octopuses, cuttle fishes) are often compared to those of vertebrates because both types contain a thin, transparent cornea, and a lens that focuses…
Invertebrate sensory receptors are : (invertebrates sensory structures crossword) (a)baroreceptors (b) chemoreceptors (c) georeceptors (d) thermoreceptors (e) phonoreceptom (f) photoreceptors (g) proprloceptors (h) tactile receptors (i) hygroreceptom (a) Baroreceptom sense…
Phylum Kinorhyncha (kinein, motion + rhynchos snout) Kinorhynchs are small, elongate bilaterally symmetrical worms. Their size is less than 1 mm. They are found exclusively in marine environments. They live…
PHYLUM ROTIFERA (rota, wheel ± (era, to bear) Characteristics of the phylum Rotifera are: 1. The rotifers derive their name from characteristic ciliated organ called corona. Corona is present around…
GENERAL CHARACTERISTICS OF ASCHELIMINTHES Aschelminthes show following characters: 1. They are first invertebrates which posses body cavity. But they lack peritoneal linings and mesenteries. These structures are found in more…
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