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head in Biological Definition

Brain

... . In most animals, the brain is located in the head . Mouse's Brain ... intelligence , memory and control of the body. head trauma, caused by automobile accidents or other ... receive information from touch receptors on the head and antennae. The antennal lobes of flies and ...

Morphogenesis

... . Labial and Deformed proteins are expressed in head segments where they activate the genes that define head features. Sex-combs-reduced and Antennapedia ... factor is damaged, the fly grows legs on its head instead of antennae. See images of this ...

Lipid

... of a Lipid. Many lipids consists of a polar head group ( P ) and a nonpolar tail ( U for ... chains are usually 14-24 carbon groups long. The head groups of the phospholipids found in ... and phosphatidylinositol, whose head group can be modified by the addition of one to ...

Morphogenesis

... . Labial and Deformed proteins are expressed in head segments where they activate the genes that define head features. Sex-combs-reduced and Antennapedia ... factor is damaged, the fly grows legs on its head instead of antennae. See images of this ...

Vestibular system

... right horizontal canal gets stimulated during head rotations to the right (Fig 2), the left ... stimulated (and thus predominantly signals) by head rotations to the left. Vestibulo-ocular ... system needs to be fast: if we want clear vision, head movements need to be compensated almost ...

Actin

... uses ATP for energy. The ATP allows, through hydrolysis , the myosin head to extend up and bind with the actin filament. The myosin head then releases after moving the actin filament in a relaxing or contracting ...

Bone

... bone marking the fusion of epiphyses to the diaphysis (adults only) head the proximal articular end of the bone Neck the region of bone between the head and the Shaft See also Fracture Bone healing ...

Actin

... uses ATP for energy. The ATP allows, through hydrolysis , the myosin head to extend up and bind with the actin filament. The myosin head then releases after moving the actin filament in a relaxing or contracting ...

Phospholipid

... nervous system. Amphiphatic character Due to its polar nature, the head of a phospholipid is attracted to water (it is hydrophilic ). The nonpolar head is not attracted to water and is said to be hydrophobic . When placed in ...

Sperm

... composed normally of a head, basal body (or midpiece ), and tail . The head contains some cytoplasm and the nuclear material for fertilization . ... a flagellum used for propulsion. In humans, sperm cells consists of a head 5 m by 3 m and a tail 50 m long. The tail flagellates , which we now ...

Albinism

... (German Language) Biblical references - William Blake's Ancient of Days was based upon the Revelation of St John the Divine, 1:14: *:"His head and hair were white like wool, as white as snow, and His eyes like a flame of fire* Albino frogs Albino Tiger Barb Albino Corydorus ...

Anatomy

... Externally visible parts of the human body: Abdomen Arm Back Buttock Chest Ear Eye Face Genitals head Joint Leg Mouth Neck Scalp Skin Teeth Tongue Other anatomic terms (not classified): Artery Coelom ...

Animal

... remaining animals form a monophyletic group called the Bilateria . For the most part, they are bilaterally symmetric, and often have a specialized head with feeding and sensory organs. The body is triploblastic, i.e. all three germ layers are well-developed, and tissues form distinct organs. The ...

ATP synthase

... the F O portion is within the membrane. It's easy to visualize the F O F 1 particle as resembling the fruiting body of a common mushroom, with the head being the F 1 particle, the stalk being the gamma subunit of F 1 , and the base and "roots" being the F O particle embedded in the membrane. The F ...

Cancer

... cancer in high-risk women by about 50%. Cis-retinoic acid also has been shown to reduce risk of second primary tumors among patients with primary head and neck cancer . Finasteride , a 5-alpha reductase inhibitor , has been shown to lower the risk of prostate cancer. Other examples of drugs that ...

Chromosome

... by the deletion of part of the short arm of chromosome 5. Victims make high-pitched cries that sound like a cat. They have wide-set eyes, a small head and jaw and are mentally retarded. Wolf-Hirschhorn syndrome , which is caused by partial deletion of the short arm of chromosome 4. It is ...

Fermentation

... 55C) activates various proteinases , which break down proteins that might otherwise cause the beer to be hazy. But care is of the essence since the head on beer is also composed primarily of proteins, so too aggressive a protein rest can result in a beer that cannot hold a head. This rest is ...

Human

... or priests , who are usually seen as possessing spiritual powers greater than or external to the normal human experience. The practice of head shrinking as found in some cultures derives from an animistic belief that one's war enemies, if the spirit is not trapped within the head, can ...

James D. Watson

... about how organisms function. All the textbooks are still in print. In 1988 , Watson's achievement and success led to his appointment as the head of the Human Genome Project at the National Institutes of Health , a position he held until 1992 . Like his late colleague, Francis Crick , ...

Animal

... remaining animals form a monophyletic group called the Bilateria . For the most part, they are bilaterally symmetric, and often have a specialized head with feeding and sensory organs. The body is triploblastic, i.e. all three germ layers are well-developed, and tissues form distinct organs. The ...

Rudolf Steiner

... of Theosophists on the subject of Nietzsche. He continued speaking regularly to the members of the Theosophical Society , eventually becoming the head of its German Section. Unlike the Theosophists, Steiner encouraged the development of artistic efforts within the Society — and this was ...

Spermatogenesis

... at this point are still round cells. During the process called spermiogenesis the sperm extrude tails, repackage DNA into a head, cap the head with a lysosome-like acrosome and construct an energy transducing neck region of tightly packed mitochondria to finally become mature testicular ...
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