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激素敏感化和诱导堕胎反应
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The Rhesus (Rh) antigen is crucial in determining blood groups and ensuring compatibility during blood transfusions.
The Rhesus Antigen and Blood Groups
The Rh antigen is a protein found on the surface of red blood cells (RBCs) in most individuals. Its presence or absence classifies a person's blood type as Rh-positive or Rh-negative. For instance, if someone with blood type A has the Rh antigen, they are classified as A positive (A+). Without the Rh antigen, their blood group is A...
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The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
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Overview
We speak of an allergy when the immune system triggers a response against a benign foreign structure, like food, pollen or pet dander. These elicitors are called allergens. If the immune system of a hypersensitive individual was primed against a specific allergen, it will trigger allergic symptoms during every subsequent encounter of the allergen. Symptoms can be mild, such as hay fever, to severe, such as potentially fatal anaphylactic shock.
Sensitization Is the First Step of an...
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Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
Types of Hypersensitivities
Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...