wheal. a raised, swollen, well-defined area on the skin resulting from an insect bite or allergic reaction.
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What is a bulla quizlet?
bulla. Small slit or cracklike sore that extends into the dermal layer. fissure. Solid, elevated, larger than 2 cm, extending into the dermal and subcutaneous layers. tumor.
What is a Chromogene quizlet?
Terms in this set (35) Chromogen. a colored molecule. Chromophore. the portion of the chromogen that gives it its color.
What is a fissure quizlet?
fissure. deep grooves that separate large regions of the brain. longitudinal fissure. separates cerebral hemispheres.
What is an allergic reaction of the skin characterized by eruption of pale red elevated patches that are intensely itching and is also called hives?
a vascular reaction of the skin marked by transient appearance of slightly elevated patches (wheals) that are redder or paler than the surrounding skin and often attended by severe itching; the cause may be certain foods, infection, or emotional stress. (See Atlas 2, Plate D.) Called also hives.
What is an example of a Wheal lesion?
A wheal is a skin lesion caused by an allergic reaction. Hives are an example of wheals.
What is an example of a bulla?
Bulla: a circumscribed, elevated fluid-filled lesion greater than 1 cm in size (e.g. epidermolysis bullosa, bullous impetigo). Macule: a circumscribed, flat lesion with color change up to 1 cm in size that is not palpable (e.g. ash leaf macules, café au lait macules).
What is chromogen in microbiology?
Definition of chromogen
1 : a precursor of a biochemical pigment. 2 : a pigment-producing microorganism.
What part of chromogen contains the colored molecules?
– Chromophore: The colored portion of the chromogen. – Auxochrome: The charged portion of the chromogen.
What is the name of the portion of the stain dye that gives the dye its charge?
Cards
| Term Stain | Definition Solutions consisting of a solvent (Water or ethanol) and a colored molecule (often a benzene derivative), the chromagen |
|---|---|
| Term Auxochrome | Definition Is the charged portion of a chromogen and allows it to act as a dye through ionic or covalent bonds between the chromogen and the cell. |
What are fissures?
Overview. An anal fissure is a small tear in the thin, moist tissue (mucosa) that lines the anus. An anal fissure may occur when you pass hard or large stools during a bowel movement. Anal fissures typically cause pain and bleeding with bowel movements.
What is a meatus quizlet?
meatus. a tubelike passageway within a bone.
What is a gyrus quizlet?
Gyrus. a convex fold or elevation in the surface of the brain. Sulcus. (anatomy) any of the narrow grooves in an organ or tissue especially those that mark the convolutions on the surface of the brain. You just studied 10 terms!
Are itchy wheals caused by an allergic reaction?
Hives are raised, often itchy, red bumps (welts) on the surface of the skin. They can be an allergic reaction to food or medicine. They can also appear without cause.
What do Wheals look like?
Hives (medically known as urticaria) appear on the skin as welts that are red, very itchy, smoothly elevated areas of skin often with a blanched center. They appear in varying shapes and sizes, from a few millimeters to several centimeters in diameter anywhere on the body.
What does Prurit mean in medical terms?
Pruritus is the medical term for itchy skin. Normally, itchy skin isn’t serious, but it can make you uncomfortable. Sometimes, itchy skin is caused by a serious medical condition.
What causes a wheal?
There can be many causes, including exposure to an allergen, a physical trigger, such as pressure from tight clothing, or an underlying health condition. The medical name for hives is “urticaria.” People also call it welts, wheals, or nettle rash. Hives affects around 20% of people at some time in their lives.
What is wheal and flare reaction?
The wheal and flare response is a descriptor used when talking about a two stage allergic response seen in Type 1 hypersensitivity. The first stage, called the wheal, is controlled by substances called acute phase mediators. The second stage, called the flare, is controlled by substances called late phase mediators.
Is a wheal a macule?
A mosquito bite causes a wheal. Urticaria (hives) are multiple wheals that usually cause severe itching from some form of hypersensitivity reaction. Macules are flat, nonpalpable lesions less than 0.5 cm in diameter. They’re circumscribed and may be brown, red, purple, white, or tan.
What is a macule?
A macule is a flat, distinct, discolored area of skin. It usually does not include a change in skin texture or thickness. The skin is the largest organ of the body.
What is a large blister called?
Very small blisters are called vesicles. Larger blisters, like these, are called bullae.