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How are nutrients distributed by the digestive system in planarias?
Planarias have single opening digestive system (incomplete) with ramifications that transport nutrients to all areas of the body.
Planarias have single opening digestive system (incomplete) with ramifications that transport nutrients to all areas of the body.
See lessWhat is the type of reproduction, sexual or asexual, that occurs in platyhelminthes?
Platyhelminthes may present sexual or asexual reproduction.
Platyhelminthes may present sexual or asexual reproduction.
See lessWhat are the best known representatives of the platyhelminth phylum?
The most popular representatives of the platyhelminthes are worms that cause human diseases, like taenia and schistosome. The planaria, since it is been extensively studied in Biology, is also well known.
The most popular representatives of the platyhelminthes are worms that cause human diseases, like taenia and schistosome. The planaria, since it is been extensively studied in Biology, is also well known.
See lessWhat is the main external morphological feature that differentiates platyhelminthes from other worms (nematodes)?
Platyhelminthes are also known as flatworms because they are worms with a flat body. This is the main external morphological feature that differentiates them from nematodes (roundworms).
Platyhelminthes are also known as flatworms because they are worms with a flat body. This is the main external morphological feature that differentiates them from nematodes (roundworms).
See lessWhat is direct development? Is there a larval stage in planarias?
Sexual reproduction with direct development is that in which there is not a larval stage in the embryonic development. When a larval stage exists it is said to be indirect development.In the sexual reproduction of planarias there is no larval stage.
Sexual reproduction with direct development is that in which there is not a larval stage in the embryonic development. When a larval stage exists it is said to be indirect development.
In the sexual reproduction of planarias there is no larval stage.
See lessWhat is cephalization? How does lateral symmetry favor cephalization?
Cephalization is the evolutionary tendency of concentration of the nervous command in central structures in which there are grouping of neurons (i.e, brain and ganglia formation). Evolutionarily the cephalization process begins with the appearance of ganglia (group of neurons) in platyhelminthes andRead more
Cephalization is the evolutionary tendency of concentration of the nervous command in central structures in which there are grouping of neurons (i.e, brain and ganglia formation). Evolutionarily the cephalization process begins with the appearance of ganglia (group of neurons) in platyhelminthes and reaches an apex in vertebrates, animals with a cranial box to protect the well-developed brain.
With lateral symmetry the body can be divided into lateral portions, superior, inferior, anterior and posterior. These portions must be integrated and controlled in some manner and this need stimulated the appearance of ganglial complexity and of beings with a head, a privileged extremity of the bilateral body where the nervous central command and important sensory organs are located.
See lessWhat are the main human diseases caused by platyhelminthes?
The main human diseases caused by platyhelminthes are schistosomiasis, tapeworm disease (cestodiasis) and cysticercosis.(Note:Diseases are studied in the “Diseases” division of this e-book.)
The main human diseases caused by platyhelminthes are schistosomiasis, tapeworm disease (cestodiasis) and cysticercosis.
(Note:Diseases are studied in the “Diseases” division of this e-book.)
See lessPlatyhelminth identity card. How are platyhelminthes characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?
Examples of representing beings: planarias, schistosomes, taenias. Basic morphology: flat worm. Type of symmetry: bilateral. Germ layers and coelom: triploblastics, acoelomates. Digestive system: incomplete. Respiratory system: nonexistent, respiration by diffusion. Circulatory system: nonexistent.Read more
Examples of representing beings: planarias, schistosomes, taenias. Basic morphology: flat worm. Type of symmetry: bilateral. Germ layers and coelom: triploblastics, acoelomates. Digestive system: incomplete. Respiratory system: nonexistent, respiration by diffusion. Circulatory system: nonexistent. Excretory system: protonephridia with flame cells. Nervous system: ganglial, beginning of cephalization. Types of reproduction: asexual and sexual.
See less