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The mouth is the body orifice through which many animals ingest food and vocalize. The body cavity immediately behind the mouth opening, known as the oral cavity (or cavum oris in Latin ), [ 2 ] is also the first part of the alimentary canal , which leads to the pharynx and the gullet .
Generally, there is no other opening to the body except the mouth, but in some cases excretory pores are known to occur in the foot, and pores may occur at the tips of the tentacles. A polyp is an animal of very simple structure, [ 1 ] a living fossil that has not changed significantly for about half a billion years (per generally accepted ...
A multicellular organism is an organism that consists of more than one cell, unlike unicellular organisms. [1] All species of animals , land plants and most fungi are multicellular, as are many algae , whereas a few organisms are partially uni- and partially multicellular, like slime molds and social amoebae such as the genus Dictyostelium .
The mouth is a tiny slit at the base of the lophophore. [26] Food passes through the mouth, muscular pharynx ("throat") and oesophagus ("gullet"), [9] all of which are lined with cilia and cells that secrete mucus and digestive enzymes. [16] The stomach wall has branched ceca ("pouches") where food is digested, mainly within the cells. [9]
The earliest insects had chewing mouthparts. Specialisation includes mouthparts modified for siphoning, piercing, sucking and sponging. These modifications have evolved a number of times. For example, mosquitoes and aphids both pierce and suck; however, female mosquitoes feed on animal blood whereas aphids feed on plant fluids. This section ...
The development of insect mouthparts from the primitive chewing mouthparts of a grasshopper in the centre (A), to the lapping type (B) of a bee, the siphoning type (C) of a butterfly and the sucking type (D) of a female mosquito.
Metazoa, known as animals, are multicellular organisms that sum more than 1.5 million living species. [14] They are characterized by a blastula phase during their embryonic development and, except for the amorphous sponges , the formation of germ layers and differentiated tissues .
It functions to cut and manipulate food in the mouth. [6] The galea is a broad, scoop-like, lobe structure, which assists the maxillary palps in sampling items before ingestion. The maxillary palp is serially homologous to the walking leg while the cardo and stipes are regarded by most to be serially homologous to the first leg segment, the ...