Knob

Knob is a term with various applications in different fields. In general, it refers to a rounded handle or a control switch. In the medical field, it can refer to a rounded protuberance found on certain bones or as a part of certain organisms.

Anatomy

In anatomy, a knob can refer to a rounded protuberance found on certain bones. For example, the femur or thigh bone has two knobs at its lower end which are known as the medial and lateral condyles. These knobs help in the articulation of the femur with the tibia or shin bone, forming the knee joint.

Microbiology

In microbiology, a knob can refer to a protrusion on the surface of certain cells or organisms. For example, in the malaria parasite Plasmodium falciparum, knobs are protein structures on the surface of the infected red blood cells. These knobs are responsible for the adherence of the infected cells to the walls of blood vessels, a key factor in the pathogenesis of severe malaria.

Other Uses

In other fields, a knob can refer to a control switch or a rounded handle. For example, in electronics, a knob is a type of switch used to control the level of a signal. In architecture, a knob can refer to a rounded handle on a door or drawer.

See Also

• Condyle
• Plasmodium falciparum
• Electronics
• Architecture