Life Cycle, Processes & Properties, DAC-EAR
None of us are born looking exactly the way that we do today; this is because humans, like other species, undergo a series of changes as they mature and age, in accordance with their biological life cycle. This process can look very different across different species. In many simple organisms and in higher animals, the life cycle is completed within a single generation, while in most plants, the life cycle is multigenerational.
Life Cycle, Processes & Properties Encyclopedia Articles By Title
dacryocystitis, inflammation and infection of the lacrimal sac, usually stemming from obstruction of the flow of......
daily reference value (DRV), set of numerical quantities developed by the U.S. Food and Drug Administration for......
damping-off, destructive disease of plant seedlings. Damping-off is caused by a number of seed- and soil-borne......
dandruff, skin disorder, a form of seborrheic dermatitis (q.v.) that affects the...
dark triad, cluster of three negative personality traits—Machiavellianism and subclinical (nonpathological) narcissism......
Sir Gavin de Beer was an English zoologist and morphologist known for his contributions to experimental embryology,......
de Toni–Fanconi syndrome, a metabolic disorder affecting kidney transport, characterized by the failure of the......
deaf history, the experience and education of deaf persons and the development of deaf communities and culture......
deaf-blindness, disability in which an individual has both a hearing impairment and a visual impairment. Deaf-blind......
deafness, partial or total inability to hear. The two principal types of deafness are conduction deafness and nerve......
deafness on Martha’s Vineyard, phenomenon in which a disproportionate percentage of the population living on Martha’s......
death, the total cessation of life processes that eventually occurs in all living organisms. The state of human......
- Introduction
- Mortality, Grief, Loss
- Process, Event, Causes
- Cell Death, Apoptosis, Necrosis
- Brainstem, Cells, Death
- Brainstem, Diagnosis, Tests
- Ancient Egypt, Rituals, Beliefs
- Mesopotamia, Mortality, Beliefs
- Hinduism, Reincarnation, Karma
- Afterlife, Immortality, Soul
- Resurrection, Judgment, Afterlife
- Descartes, Pineal, Brainstem
- Attitudes, Beliefs, Rituals
deceleration injury, impact injury to a body within or upon a rapidly moving object caused by the forces exerted......
decompression sickness, physiological effects of the formation of gas bubbles in the body because of rapid transition......
deep vein thrombosis (DVT), formation of a blood clot in a vein that lies deep beneath the surface of the skin.......
defecation, the act of eliminating solid or semisolid waste materials (feces) from the digestive tract. In human......
dehydration, loss of water from the body; it is almost invariably associated with some loss of salt (sodium chloride)......
delayed puberty, failure of the physical development of the reproductive system by the normal stage or period of......
delirium, a mental disturbance marked by disorientation and confused thinking in which the patient incorrectly......
delirium tremens (DTs), delirium seen in severe cases of alcohol withdrawal (see alcoholism) complicated by exhaustion,......
delusion, in psychology, a rigid system of beliefs with which a person is preoccupied and to which the person firmly......
dementia, general term for any of a number of conditions marked by chronic, usually progressive deterioration of......
dementia with Lewy bodies, chronic, progressive disease characterized by the deterioration of intellectual capacity,......
dengue, acute infectious mosquito-borne fever that is temporarily incapacitating but rarely fatal. Besides fever,......
dentin, in anatomy, the yellowish tissue that makes up the bulk of all teeth. It is harder than bone but softer......
depersonalization, in psychology, a state in which an individual feels that either he himself or the outside world......
depression, in psychology, a mood or emotional state that is marked by feelings of low self-worth or guilt and......
dermatillomania, psychiatric disorder in which an individual compulsively picks at their skin to the extent that......
dermatitis, an inflammation of the skin usually characterized by redness, swelling, blister formation, and oozing......
dermatochalasis, sagging of the eyelid skin and underlying muscle that occurs commonly during the aging process.......
dermatome, the outer portion of an embryo from which the skin and subcutaneous tissues are developed and, postnatally,......
dermatomyositis, chronic progressive inflammation of the skin and muscles, particularly the muscles of the shoulders......
desquamation, peeling or shedding of the superficial portion of the epidermis, or outermost layer of the skin.......
detached retina, eye disorder involving separation of the transparent light-sensing portion of the retina from......
Like the laws of human society, the laws of natural selection are ripe for exploitation. It isn’t just survival......
diabetes, either of two disorders of the endocrine system. For information about the disorder caused by the body’s......
diabetes insipidus, pathological endocrine condition characterized by excessive thirst and excessive production......
diabetes mellitus, disorder of carbohydrate metabolism characterized by impaired ability of the body to produce......
diabetic ketoacidosis, complication of diabetes mellitus, characterized by an abnormal acceleration in the breakdown......
diabetic nephropathy, deterioration of kidney function occurring as a complication of diabetes mellitus. The condition......
diapause, spontaneous interruption of the development of certain animals, marked by reduction of metabolic activity.......
diarrhea, abnormally swift passage of waste material through the large intestine, with consequent discharge of......
dieback, common symptom or name of disease, especially of woody plants, characterized by progressive death of twigs,......
digestion, sequence by which food is broken down and chemically converted so that it can be absorbed by the cells......
digestive system disease, any of the diseases that affect the human digestive tract. Such disorders may affect......
- Introduction
- Dental Caries, Oral Health, Bacteria
- Esophageal Disorders, Gastrointestinal Issues, Dysphagia
- Motility, Symptoms, Treatment
- Diverticula, Symptoms, Treatment
- Gastric Ulcers, Gastritis, Dyspepsia
- Gastritis, Symptoms, Causes
- Travelers' Diarrhea
- Parasitic Infections
- Colitis, Crohn's, Ulcerative
- Abscesses, Symptoms, Treatment
- Crohn's, Inflammatory Bowel, Autoimmune
- Liver Disease, Symptoms, Treatment
- Acute Cholestatic Hepatitis, Canalicular Injury, Liver Damage
- Liver Complications, Advanced Disease, Symptoms
- Biliary Tract, Symptoms, Treatment
- Jaundice, Liver, Pancreas
- Pancreatitis, Chronic, Symptoms
human digestive system, system used in the human body for the process of digestion. The human digestive system......
- Introduction
- Teeth, Enzymes, Digestion
- Salivary Glands, Enzymes, Digestion
- Pharynx, Esophagus, Stomach
- Esophagus, Stomach, Intestines
- Blood, Nerve Supply
- Gastric Mucosa, Digestive Processes, Enzymes
- Gastric Secretion, Digestive Process, Nutrient Absorption
- Anatomy, Organs, Processes
- Contractions, Motility, Digestion
- Enzymes, Absorption, Nutrients
- Secretions, Enzymes, Absorption
- Rectum, Anus, Digestion
- Organs, Processes, Functions
- Microscopic Anatomy, Organs, Processes
- Bile, Enzymes, Absorption
- Islet Cells, Digestion, Nutrition
- Proteins, Enzymes, Absorption
- Fats, Enzymes, Absorption
- Calcium, Enzymes, Absorption
- Intestinal Gas, Digestive Process, Nutrition
- Hormones, Enzymes, Absorption
- Gastrointestinal Tract, Immunity, Digestion
- Evolution, Development, Anatomy
invertebrate digestive system, any of the systems used by invertebrates for the process of digestion. Included......
digit malformation, in human physiology, any of the isolated anomalies of the digits (fingers or toes) in an otherwise......
diphtheria, acute infectious disease caused by the bacillus Corynebacterium diphtheriae and characterized by a......
disaster epidemiology, the study of the effects of disasters on human populations, mainly by the use of data collection......
disease, any harmful deviation from the normal structural or functional state of an organism, generally associated......
dislocation, in physiology and medicine, displacement of the bones forming a joint, with consequent disruption......
display behaviour, ritualized behaviour by which an animal provides specific information to others, usually members......
dissociative disorder, any of several mental disturbances in humans in which normally integrated mental functions,......
dissociative identity disorder, mental disorder in which two or more independent and distinct personality systems......
distemper, Viral disease in two forms, canine and feline. Canine distemper is acute and highly contagious, affecting......
diverticulitis, inflammation of the diverticula, or small pouches, that form in the lining of the large intestine.......
diverticulum, any small pouch or sac that forms in the wall of a major organ of the human body. Diverticula form......
dizygotic twin, two siblings who come from separate ova, or eggs, that are released at the same time from an ovary......
The answer is “probably.” Research has shown that many animals experience a sleep phase similar to humans known......
The answer: it depends on the bee. There are more than 20,000 species of bees, with quite a bit of diversity when......
Schizophrenia—any of several severe mental disorders having such symptoms as hallucinations, disorganized thinking,......
Many marine fish, i.e., those that live in seawater, drink large quantities of water, while freshwater fish typically......
It is a common misconception that sharks as a species never sleep because they must keep moving to stay alive.......
Snakes do sleep, but their sleep patterns are significantly different from those of mammals and birds. Snakes,......
No, vaccines do not cause autism. This damaging claim became a controversial issue in 1998, when a paper published......
The belief that we swallow an average of eight spiders in our sleep every year has become so ingrained in popular......
Whales do sleep, but their sleep is quite different from what we typically understand as sleep in humans. Whales,......
dominance hierarchy, a form of animal social structure in which a linear or nearly linear ranking exists, with......
doping, use of substances or techniques to illegally improve human performance and, more specifically, to gain......
dormancy, state of reduced metabolic activity adopted by many organisms under conditions of environmental stress......
double fertilization, in flowering plant reproduction, the fusion of the egg and sperm and the simultaneous fusion......
double vision, perceiving of two images of a single object. Normal binocular vision results from the brain’s fusion......
dourine, venereal disease of horses, caused by the protozoan Trypanosoma equiperdum. The disease, which involves......
Down syndrome, congenital disorder caused by the presence in the human genome of extra genetic material from chromosome......
downy mildew, disease of plants, especially in cool humid regions, caused by several funguslike organisms of the......
Hans Adolf Eduard Driesch was a German experimental embryologist and philosopher who was the last great spokesman......
drowning, suffocation by immersion in a liquid, usually water. Water closing over the victim’s mouth and nose cuts......
drug abuse, the excessive, maladaptive, or addictive use of drugs for nonmedical purposes despite social, psychological,......
drug allergy, hypersensitivity reaction to therapeutic agents that occasionally occurs on subsequent exposure to......
drug overdose, ingestion or administration of a drug or drugs in an amount that exceeds recommended levels or quantities......
drug resistance, Property of a disease-causing organism that allows it to withstand drug therapy. In any population......
drupe, in botany, simple fleshy fruit that usually contains a single seed, such as the cherry, peach, and olive.......
dry rot, symptom of fungal disease in plants, characterized by firm spongy to leathery or hard decay of stem (branch),......
Dupuytren’s contracture, flexion deformity of the hands caused by thickening of the fascia, or fibrous connective......
Dutch elm disease, widespread fungoid killer of elms (Ulmus species) and certain other trees, first described in......
dwarfism, condition of growth retardation resulting in abnormally short adult stature and caused by a variety of......
dysarthria, motor speech disorder in which neurological damage impairs the ability of nerves to send messages to......
dysentery, infectious disease characterized by inflammation of the intestine, abdominal pain, and diarrhea with......
dyslexia, an inability or pronounced difficulty to learn to read or spell, despite otherwise normal intellectual......
dysmenorrhea, pain or painful cramps felt before or during menstruation. Dysmenorrhea may be primary or secondary.......
dyspareunia, painful or difficult sexual intercourse in the female. Disorders are generally physical rather than......
dysphagia, difficulty or pain in swallowing, caused by lesions or stricture of the upper digestive tract, obstruction......
dysplasia, malformation of a bodily structure or tissue; the term most commonly denotes a malformation of bone.......
dystonia, movement disorder characterized by the involuntary and repetitive contraction of muscle groups, resulting......
ear bone, any of the three tiny bones in the middle ear of all mammals. These are the malleus, or hammer, the incus,......
ear disease, any of the diseases or disorders that affect the human ear and hearing. Impaired hearing is, with......
ear squeeze, effects of a difference in pressure between the internal ear spaces and the external ear canal. These......
human ear, organ of hearing and equilibrium that detects and analyzes sound by transduction (or the conversion......
- Introduction
- Anatomy, Hearing, Balance
- Eardrum, Ossicles, Hearing
- Cochlea, Vestibule, Semicircular Canals
- Cochlea, Hearing, Balance
- Hearing, Cochlea, Organ of Corti
- Endolymph, Perilymph, Hearing
- Hearing, Anatomy, Physiology
- Sound Waves, Outer & Middle Ear
- Bone Conduction, Hearing, Vibration
- Cochlea, Hair Cells, Auditory Nerve
- Cochlear Nerve, Auditory Pathways
- Auditory Nervous System, Hearing, Sound
- Hearing Tests, Anatomy, Acoustics
- Balance, Vestibular, Physiology
earwax impaction, filling of the external auditory canal with earwax, or cerumen. Normally the wax produced by......
