Dictionary,Defintion,Meaning,What is Viviparous, Voluntary Muscle, Vitamin A, Vitamin B Complex, Vitamin D, Vitamin E

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Home >>Biology Dictionary >> Viviparous - Voluntary Muscle

Your Ad Here	Vitamin A. Required by man and other vertebrates. Fate soluble. Stored in liver. Deficiency in man causes nightblindness and karatinization of cornea, and other effects involving epidermis and nervous tissue. Carotene which is synthesized by green plants, and some related pigments, can be converted by animals to Vitamin A, and the vertebrates obtain their supply of the vitamin ultimately from this source. Vinamin B Complex. Several water-soluble vitamins formerly thought to be a single vitamin. (See Biotin Cobalamine (B₁₂), Folic acid, Nicotinic acid, Pantothenic acid, Pydridoxine (B₆), Riboflavin (B₂), Thiamin (B₁). Vitamin D. Required as a vitamin by man, though some is synthesized, and by other vertebrates. Fat soluble sterol. Stored in liver. It’s deficiency in childhood causes rickets and in adults, sometimes softening of bones. Synthesized by man by action of ultraviolet on a precursor in the skin. Several slightly different sterols have vitamin D acts as the precursor of a hormone synthesized in the kidney which controls the absorption of calcium through the intenstine and also effects the resorption of bone.
Vitamin E (Tocopherol). Required as a vitamin by vertebrates. Fat soluble, Deficiency causes abortion, and sterility in male. Vitamin F. Linoleic acid. Vitamin K. Required as a vitamin by man, other mammals, and birds. Fat soluble. Deficiency causes proneness to haemorrhage. Various slightly different compounds have Vitamin K activity, has been synthesized in water soluble form. Vitelline membrane. Membrane which immediately surrounds ovum of animals. It is secreted by the Ovum.
Viviparous. Having embryos which develop within the maternal organism and derive nutriment by close contact with maternal tissues, frequently by a placenta, without interposition of any egg membranes. Viviparity occurs in all placental mammals, and sporadically in other groups of animals. Having seeds which germinate within the fruit, the fruit, e.g. mangrove; or producing shoots for vegetative reproduction instead of an inflorescence, as in some grasses. Vocal cords. A pair of elastic membranes that project into the laynx in air-breathing vertebrates. Vocal sounds are produced when expelled air passing through the larynx vibrates the cords. Th pitch of the sound produced depends on the tension of the cords, which is controlled by muscles and cartilages in the larynx. Voluntary Muscle (skeletal, striped, or striated muscle). Muscle that is under the control of the wall and is generally attached to the skeleton.	Your Ad Here
An individual muscle consists of bundles of long muscle fibres, each containing many nuclei, the whole muscle being covered with a strong connective tissue sheath (epimysium) and attached at each end to a bone by inextensible tendons. Each fibre contains smaller fibres (myofibrils) having alternate light and dark bands (sarcomeres), which are responsible for the muscle’s contractile ability and its typical striped appearance under the microscope. The end of the muscle that is attached to a non moving bone is called the origin of the muscle; the end attached to a moving bone is the insertion. As a muscle contracts it becomes shorter and fatter, moving one bone closer to the other since a muscle ( the extensor, or antagonist) is required to move the bone in the opposite direction and stretch the first muscle known as the flexor, or agonistic muscle. Vitamin C. Ascorbic acid.
Your Ad Here	Vomer. The thin flat bone forming part of the separation between the nasal passages in mammals. Vulva. The external opening of the vagina, comprising in women the female external gentialia- - two pairs of fleshly folds tissue. Vitreous Humour. Jelly-like material which fills cavity of vertebrate eye behind the lens.

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Biology Dictionary - Part 3 Part 4 Thread Cell - Tissue Culture Trachea - Transcription Transplatation - Tropism Turbellaria - Tyrosine Ultramicroscope - Uricotelic Utriculus - Vagus Nerve Vasomotor - Vestigial Organ Villus - Vitamin Viviparous - Voluntary Muscle Warning Coloration - Wolffian Duct Xanthophyta - Xiphosura Y Chromosome - Yeasts Zygomatic Arch - Zymogen Granule

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