Flashcards in Cellular Reaction to Injury Deck (69):
oxygen deprivation (hypoxia), nutritional deficiencies, chemical agents (prescription drugs, air pollutants, alcohol, asbestos, pesticides), autoimmune diseases and infections, genetic defects, aging process (cellular senescence).
Etiology of Cellular Changes
Passive (worsen) cell alteration that may result in:
Regressive Cellular Changes
Increase in cell water content due to cell injury that allows intracellular sodium to rise.
- Entire organ or tissue experiences loss of color, cells that become distended.
Loss of color.
Cells become distended.
The deterioration of tissues with corresponding functional impairment as a result of disease resulting in appearance of substances within the cell that are not normally present.
Deposit of abnormal amounts of fat in cells; e.g. , heart, liver, kidneys.
This is due to malnutrition, diabetes mellitus, obesity, or starvation.
Deposit of amyloid (starch like protein) giving tissues waxy, translucent, hyaline appearance.
e.g., liver, kidneys, adrenal glands
This is due to diabetes mellitus, poisons, often secondary to chronic rheumatoid arthritis, carcinoma, tuberculosis, osteomyelitis, Hodgkin's disease.
Jelly-like appearance of tissues.
E.g., lungs- anthracosis: lung dust disease due to inhalation of coal pigment.
The process of seepage or diffusion into tissue of substances that are not ordinarily present; abnormal passing and deposit of substances in tissue.
Deposit of fat in tissues often due to poisons or diet, occurs mostly in the liver, kidneys, and heart.
Coloration caused by deposit, or lack, or colored material in the tissues (increase or decrease in pigment deposit).
Pigment transmitted from outside the body.
Carotene in blood; resulting in discoloration of the liver and skin.
Due to lead poisoning > discoloration to gums, damage to the brain and other internal organs.
Pigment present inside the body
changes in the retina of the eye
jaundice (icterus= bile pigments)
Moles, melanomas, freckles
Calcium deposits (lime salts) in tissue, usually surrounded by bacteria, necrotic cells, mucous, foreign materials.
Renaliths (renal calculi)
Calcification in the intestines or appendix
Calcification in the nose
Calcification in the lungs
Calcium deposits in the arteries
Stone baby, calcified fetus, usually in fallopian tubes.
Primary chronic metabolic disorder (a common form of arthritis) associated with elevated blood uric acid level.
results in accumulation of uric acid and uric acid salts in joints (often the big toe), kidneys, external ear and eyelids.
Causes swelling, arthritic pain and deformed joints.
Cell degeneration that can lead to cell and tissue death without replacement.
Mechanical injury, malnutrition, heat or cold, loss of nerve supply, low oxygen (hypoxia), or no oxygen (anoxia) delivered to tissues, drugs or bacterial toxins, or viruses.
Causes of cellular death
Programmed cell death
Cell death caused by disease
Rare genetic diseases associated with early aging and short life span
Progeria and Werner's syndrome
Degeneration of proteins; tissues becomes dry, firm, form yellowish mass that occurs due to ischemia, infarct, or heat. (most common)
Result of certain infections such as tuberculosis, tissue has a creamy-white, "cheesy" appearance (flaky, crumbly).
Necrotic tissue softens, becomes wet; usually due to infections.
Death of tissue due to lack of blood supply (common complication of healing). Tissue has a dry, firm, blackened, mummified appearance as in diabetics, or frostbite.
Necrosis of tissue, usually resulting from deficient or absent blood supply; most common in the lower extremities.
caused by infection, insufficient blood supply,
results in ischemia, putrefaction
Decomposition of organic matter, especially protein, by microorganisms, resulting in production of foul-smelling matter.
Types of gangrene
Results from obstruction of ARTERIAL blood flow with or without invasion by bacteria, usually in extremities.
symptoms: tissue is dry, shrunken, dark black, resembles mummified flesh, as in diabetics.
Dry (Ischemic Necrosis) Gangrene
Results from inadequate VENOUS drainage, occurs in naturally moist tissue and organs suck as the mouth, intestines, lungs, cervix, and vulva; often in extremities or area of bedsores (sacrum, buttocks, heels)
Etiology: following ischemia, or infarction, invasion by saprogenic microorganisms (perfringes, fusiformis, putrificans).
Moist (wet) Gangrene
feed on dead organic matter
swelling of tissue (edema), tissue site is cold and has no pulse, moist black skin under tension, liquefaction (tissue softens) > foul odor, condition spreads.
Symptoms of moist gangrene.
Similar to moist gangrene, but caused by anaerobic bacterium Clostridium perfringens.
symptoms: same for moist gangrene, crepitation, severe tissue necrosis, sepsis, toxemia
Stretching of tissue due to gas production by bacteria.
Whole-body inflammatory state caused by infection.
Adaptive responses to cellular injury
Wasting, decrease in size of organ or tissue
Normal decrease in size of an organ or tissue, resulting from conditions such as hormonal changes or senility (skin changes)
Decrease in the size of an organ or tissue due to disease.
caused by inadequate nutrition (insufficient blood supply), pressure on bones or other organs or disuse, loss of nerve supply, loss of endocrine stimulation.
The enlargement of an organ or part due to the increase in SIZE of cells composing it.
Normal adaptation to increase functional demand (like enlarging of the breast during lactation). The increased size of the cells enlarge the organ or part.
Enlargement of an organ or part due to enlargement of cells as a result of disease.
Absence of disease, increase in the size of an organ or tissue to counteract a structural or functional defect.
The increased size of an organ or part due to the excessive but regulated increase in the NUMBER of cells.
Uterine hyperplasia at puberty is an example of this.
Prostatic hyperplasia that can lead to cancer or adrenal gland hyperplasia are examples of this.
The replacement of one type of tissue into a form that is not normally found there.
- this is normally replaceable, but may lead to cancer.
The replacement of damaged cells with identical cells (except for nervous tissue)
Restoration of tissue elements under normal condition.
Replacement of lost tissue as a result of trauma or infection by connective tissue forming scars.
Cessation of vital activities of the body resulting in cell degeneration, necrosis, atrophy.
can lead to organ failure or system shutdown
results in somatic and cadaveric changes
no heart sounds, no respiration, facial and eye changes due to lack of nervous stimulation and blood supply (sunken glazed eyes, pale ashen skin, thin nose, prominent lips), complete muscle relaxation.
Seen after somatic death
algo mortis, rigor mortis, livor mortis, putrefaction
Cooling of the body, the body reaches environmental temperature in approximately 24 hours post mortem.
Stiffening of the body, starts 4-12 hours after death with the eyelids, jaws, head, limbs; usually lasts 24-36 hours.
"Bluish color", accumulation of blood in organs leads to dark red discoloration in tissue (blood pooled in capillaries and diffused into tissue due to lack of heart action and gravity); starts 1-6 hours after death.