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Mammals in Biological Dictionary

Placental mammals

... The class Mammalia (the mammals ) is divided into two subclasses based on reproductive techniques: egg laying mammals ; and mammals which give live birth. The latter subclass is ...

Omnivores

... ... NatureWorks ... Omnivores include mammals like grizzly bear, striped skunk and raccoon and ... the opossum and the ... Omnivores include mammals like the grizzly bear, skunk, and raccoon and ... from ... Humans are omnivores . The order of mammals that includes humans (the primates) ... ...

Monotremes

... Monotremes are mammals that lay eggs (Prototheria) instead of giving ... like marsupials (Metatheria) and placental mammals (Eutheria). Introduces the egg-laying ... ... Mammals, Marsupials and Monotremes . mammals are animals that have warm blood. ... All ...

Marsupials

... early infancy. Marsupials are the group of mammals commonly thought of as pouched mammals. ... In ... ... Marsupial , common name for a group of mammals typically distinguished by a pouch ... ...... marsupial n. Any of various nonplacental mammals of the order Marsupialia, including kangaroos, ...

Mammary gland

... are enlarged and modified sweat glands and give mammals their name. The mammary glands of domestic mammals containing more than two breasts are ... ... Mammary glands are the organs in female mammals that produce and secrete milk ... Additionally, ...

Mammals

... mammals are a class of vertebrate animals whose ... used in hearing, and ... The evolution of mammals within the synapsid lineage was a gradual ... there were many species that looked like mammals , and ... ...

Insectivores

... doi:10. ... Insectivores are carnivorous mammals that survive by eating almost nothing but small ... ) ( vertebrate zoology ) An order of mammals including ... Most of the primitive eutherian (placental) mammals were insectivores . ... Entrez! ( Français) ...

Carnivores

... Categories: Carnivores ... NatureWorks ... mammals that are carnivores have sharp teeth adapted ... animal. Any of various predatory, flesh-eating mammals of the order Carnivora, including the dogs, ... and Yard. Carnivores are meat-eating mammals in the animal kingdom. ... But before you ...

Placenta

... The placenta is an organ unique to mammals that connects the developing fetus to the uterine wall. The placenta ... pl. -tas or -tae . A membranous vascular organ that develops in female mammals during pregnancy, lining the uterine wall and ... The placenta . ... ...

Oogonia

... led to the production of multiple sporophytes per female. ... In most mammals oogonia proliferate by mitosis and begin meiotic development during ... ... The stem cells of eggs, the oogonia , are not present in mammals at the time of birth. ... embryonic development, all of the oogonia ...

Molar teeth

... This kind of molar is found in mammals that wear their teeth a lot, such as the horse. ... Teeth . ... grind food, located behind the premolars. ... kind of molar is found in mammals that wear their teeth a lot, such ... Information about Molar ...

Homeothermic

... photos, keep in touch with classmates, and meet new people on MySpace. mammals are warm blooded animals, but how is this achieved and how does this benefit mammals? ... All mammals are endothermic and most are homeothermic . ... In humans and other ...

Gastrulation

... of gastrulation is complete the primitive streak disappears. ... 3. mammals - gastrulation similar to birds and reptiles, even though eggs possess ... in human ... Do all amniotes go through gastrulation as birds and mammals do? ... Gastrulation begins three hours after fertilization. ... ...

Allantois

... liquid waste. an extra-embryonic membrane of reptiles, birds, and mammals arising as a pouch, or sac, from the hindgut. In reptiles and birds it ... respiratory organ while its cavity stores fetal excretions. In mammals other than marsupials the allantois is intimately associated ... ...

Wolffian duct

... Horm. Res. ... Wolffian duct . Definition from Wiktionary, a free dictionary. Jump to: ... Wolffian duct . a paired organ found in mammals including humans during embryogenesis ... In males, the Wolffian ducts develop into epididymis, vas deferens, and seminal ... Wolffian ...

Urine

... waste compounds, many rich in nitrogen, that require elimination from ... urine n. The waste product secreted by the kidneys that in mammals is a yellow to amber-colored, slightly acid fluid discharged from the body A routine urine screening test may be done to help find the cause ...

Sex chromosome

... determination. Human diploid cells have 22 pairs of autosomes and 1 pair of sex ... The sex chromosomes of human beings and other mammals are designated by scientists as X ... Bird and Mammal Sex - Chromosome Orthologs Map to the Same ... The majority of known types of chromosomal ...

Sex chromosomes

... of a normal male with 22 pairs of autosomes and one pair of sex chromosomes . ... The sex chromosomes of human beings and other mammals are designated by scientists as X ... Bird and Mammal Sex - Chromosome Orthologs Map to the Same ... Each person normally has one pair of sex ...

Seminal vesicles

... male mammals. The two seminal vesicles contribute approximately 60 percent of the fluids passed from the human male during ejaculation. In some mammals the capacity of the seminal vesicles is much larger; the boar, for example, may emit up to 50 ... Discussion of Diagnosis: A discussion of ...

Scrotum

... In some male mammals the scrotum is a protuberance of skin and muscle containing the testicles. It is an extension of the abdomen, and is located between the penis ...

Salivary glands

... The salivary glands in mammals are exocrine glands , glands with ducts, that produce saliva. They also secrete amylase, an enzyme that breaks down starch into glucose. In ...

Reverse genetics

... ... Reverse genetics studies gene function by targeted mutations and observation of ... Since the early 1980s, reverse genetics in mammals have primarily relied upon ... ...

Renal portal system

... . ... by the renal portal system [8] ... The renal portal system is found only in fishes, amphibians, reptiles and birds. Thus, mammals have no renal portal system . ... ... in the anatomy of the renal portal system (Johnson, 1979) and the specific ... to the ...

Poikilothermic

... metabolism rate in the poikilothermic animal drops. ... 1. Scientific evidence supports the theory that birds evolved from _. protozoans mammals amphibians reptiles 2. Feathers and hair are composed of a protein ... ... Center | Glossary | Poikilothermic . Browse by Letter ... ...

Paraphyletic

... its ... for example, "seedless plants" is paraphyletic because its last common ancestor ... Reptilia alone is paraphyletic since it excludes mammals and ... Paraphyletic . Phenetic classification. Phyletic classification. Phylogenetic classification ... Paraphyletic group. A paraphyletic ...

Paleontology

... authoritative websites; links to online texts, newspapers, and magazines; ... The program emphasizes vertebrate paleontology of dinosaurs and mammals and ... Paleontology M.S. Physics. Robotics & Intelligent Autonomous Systems M.S. ... ...

Oviducts

... also known as oviducts , uterine tubes, and salpinges are two very fine tubes lined with ciliated epithelia, leading from the ovaries of female mammals into the uterus, ... ... animal anatomy > reproductive system > female reproductive system > oviducts ... Resources in ...

Menstruation

... cycle is a recurring cycle of physiologic changes that occurs in reproductive-age females. Overt menstruation occurs primarily in humans and other mammals such as chimpanzees. Females of other species ... Provides information, products, and an alternative viewpoint about menstruation . ...

Lungs

... The lung is the essential respiration organ in air-breathing animals, including most tetrapods, a few fish and a few snails. In mammals and the more complex life forms, the two lungs are located in the chest on either side ... The human lungs are the organs of respiration ...

Lung

... or pulmonary system is the essential respiration organ in air-breathing animals, including most tetrapods, a few fish and a few snails. In mammals and the more complex life forms, the two lungs are located in ... Lung cancer is a disease of uncontrolled cell growth in tissues of the ...

Larynx

... The larynx , colloquially known as the voicebox, is an organ in the neck of mammals involved in protection of the trachea and sound production. The larynx houses the vocal folds, and is situated just below where the tract of the ...

Imprinting

... expressed only from the allele ... Before imprinting takes place, the brain of the young bird has a capacity to ... Imprinting in mammals is more rare. ... discovering imprinting , Lorenz ... The imprinting Foundation is dedicated to the development and extension of new ...

Homology

... or a group. See homology theory for more background, or singular homology for a concrete version ... Homology (biology) Forelimbs in mammals provide one example of homology . ... In evolutionary biology, homology refers to any similarity between ... homology n. , pl. -gies . The ...

Heterodont

... Free Trial, Credit Card Required. What is a(n) heterodont – Our zoology dictionary has ecology, physiology, ... heterodont ... The mammals have heterodont dentition, or teeth of different basic types, ... heterodont Having teeth of different shapes, as molars, incisors, etc. ... ...

Fallopian tubes

... also known as oviducts, uterine tubes , and salpinges are two very fine tubes lined with ciliated epithelia, leading from the ovaries of female mammals into the uterus. fallopian tube also Fallopian tube n. Either of a pair of slender ducts through which ova pass from the ovaries to the ...

Fallopian Tube

... also known as oviducts, uterine tubes, and salpinges are two very fine tubes lined with ciliated epithelia, leading from the ovaries of female mammals into the uterus. Primary fallopian tube cancer (PFTC), often just tubal cancer, is a malignant neoplasm that originates from the fallopian ...

Erythrocytes

... metalloprotein containing ... Erythrocytes are formed in the red bone marrow and afterward are found in the blood. ... Erythrocytes in mammals are disk-shaped, biconcave (flattened and ... Online Medical Dictionary and glossary with medical definitions ... Erythrocytes are very ...

Endocytosis

... Endocytosis Methods in Molecular Biology 2nd edition ... ENDOCYTOSIS AND THE ACTIN CYTOSKELETON. ENDOSOMES AS MOTILE SIGNALING PLATFORMS IN mammals ... Endocytosis is the internalization of plasma membrane proteins ... ...

Determinate growth

... and fruit ... Aspects of the topic determinate - growth are discussed in the following places at Britannica. Assorted References hair on mammals ( in mammal: Skin and hair ) Continuous growth of hair (indeterminate), as seen on the heads of humans, is rare among mammals. Hairs with ...

Complement

... which promotes ... 12th European Meeting on Complement in Human Disease. September 5-8, 2009, ... The complement system found in the blood of mammals is composed of heat labile ... Click here to see how complement can be used in diagnostic testing. ... complement synonyms. complement ...
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