59717

Adenopathy refers to the enlargement of glands, particularly lymph nodes, which is clinically apparent as swelling or abnormal size.

95149

The impression material that can record tissues in functional form is impression paste.

96260

The normal plasma concentration of glucose that does not lead to its excretion in the urine is approximately 100 mg/100 ml, below which glucose is typically reabsorbed completely.

61993

Opsonins are molecules that enhance the phagocytosis of antigens by binding to their surfaces and acting as markers or labels that make them more recognizable to phagocytes.
1. lgG (Fc fragment): Immunoglobulin G (IgG) is the most common antibody isotype in human serum. It plays a crucial role in the secondary immune response. The Fc region of IgG is the fragment that interacts with Fc receptors present on the membrane of phagocytic cells. When an antigen is coated with IgG, the Fc fragments of these antibodies can bind to the Fc receptors, leading to the activation of the phagocytic process. This is known as antibody-dependent phagocytosis, where the antibody acts as an opsonin to facilitate the recognition and engulfment of the antigen by phagocytic cells.

2. C3b of complement cascade: The complement system is a cascade of proteins that can be activated in response to an infection or the presence of foreign substances. C3 is a central protein in this system, and when it is cleaved into C3a and C3b, the latter can bind directly to antigens. C3b acts as an opsonin by coating the surface of pathogens. The presence of C3b on a microbial surface allows it to be recognized by complement receptors on phagocytic cells, such as macrophages. This interaction enhances the efficiency of phagocytosis, as the receptors can recognize the bound C3b and engulf the antigen more readily.

3. IgM (Fc fragment) and C5b of complement cascade: While IgM is the first antibody isotype produced in response to an infection and can also opsonize antigens, it is less efficient than IgG due to its pentameric structure and lower affinity for phagocytic receptors. However, it is not as commonly associated with phagocytosis as IgG. Regarding C5b, it is part of the membrane attack complex (MAC) and is involved in the direct destruction of pathogens rather than acting as a classical opsonin that leads to phagocytosis. The MAC assembles on the surface of the antigen and creates pores, leading to osmotic lysis and destruction of the cell membrane.

57796

1. It is associated with platelet-specific autoantibodies: This statement is true. ITP is characterized by the presence of autoantibodies that specifically target and destroy platelets, leading to thrombocytopenia (low platelet count).

2. It causes a prolonged bleeding time: This statement is true. In ITP, the low platelet count results in a prolonged bleeding time, as there are fewer platelets available to form a clot.

3. It is often controllable by immunosuppressive treatment: This statement is true. ITP can often be managed with immunosuppressive therapies, such as corticosteroids, intravenous immunoglobulin (IVIG), or other immunosuppressive agents, to help increase platelet counts.

4. It causes more prolonged hemorrhage than hemophilia: This statement is not true. While both ITP and hemophilia can lead to bleeding, the mechanisms are different. Hemophilia is a clotting factor deficiency, which can lead to more severe and prolonged bleeding episodes, especially after trauma or surgery. In contrast, ITP primarily affects the number of platelets rather than the clotting factors. Therefore, the bleeding in hemophilia can be more severe and prolonged compared to that in ITP.

80267

The generally accepted "certainly lethal dose" range for 70 kg adults, i.e., from 5 to 10 g of sodium fluoride or from 32 to 64 mg fluoride/kg

76579

Acute hemolytic transfusion reactions are primarily caused by ABO incompatibility between the donor and recipient, leading to rapid destruction of transfused red blood cells.

32631

Explanation: A high V-shaped palate can compromise the retention and stability of a complete denture because it reduces the surface area for the denture to contact and conform to the palate. This results in less suction and a smaller seal, making the denture more likely to dislodge during function.

20567

Systemic lupus erythematosus is a systemic disease with renal manifestations that can cause nephrotic syndrome, but it is not a primary glomerular disease. The primary glomerular diseases listed that can lead to nephrotic syndrome are membranous nephropathy, minimal-change disease, and focal segmental glomerulosclerosis.

35871

In a bruxism patient, the muscle that exhibits overdevelopment is the masseter.