Capillary

A tiny blood vessel that connects arteries and veins, forming a network throughout the body and facilitating the exchange of oxygen, nutrients, and waste products. Capillaries have extremely thin walls, allowing for efficient diffusion of substances. They are essential for the functioning of all tissues and organs. The term can also refer, by extension, to any fine, hair-like tube or channel, such as those used in scientific instruments or in plants for water transport. These minute structures are crucial for maintaining the body's internal environment and supporting vital biological processes. Capillaries are integral to both the circulatory and lymphatic systems.

Capillary meaning with examples

• The doctor examined the patient's fingertips to assess the capillary refill, which provided information about blood flow. Healthy capillaries ensure tissues receive adequate oxygen. Poor capillary function, as assessed by this quick and easy test, could indicate potential circulation problems, signalling a need for further examination, and a sign of other possible underlying health problems.
• During exercise, the capillaries in the muscles dilate, increasing blood flow to deliver more oxygen and nutrients. This increased capillary activity allows for enhanced energy production, thus supporting peak athletic performance, as well as removing metabolic waste. A lack of oxygen could make those working muscles fatigue early and cause discomfort.
• The dermatologist observed the broken capillaries on the patient's face, which resulted in the appearance of redness. Certain cosmetic procedures can help address these issues. Fragile or damaged capillaries, frequently seen with rosacea, can be a cosmetic concern, often making patients self-conscious; though, the source of the broken capillaries also contributes to a possible health concern.
• The capillaries in the lungs play a vital role in gas exchange, allowing oxygen to enter the bloodstream and carbon dioxide to leave. This is essential for respiration. This is what makes it possible for us to take breaths that supply our entire bodies with necessary oxygen and remove the waste carbon dioxide from the blood so we can breathe that out.
• In plant biology, the capillary action in the roots enables water to travel up the stem. This is an important principle that keeps plants alive. This process, driven by cohesion and adhesion of water molecules, demonstrates the importance of capillaries, even in the absence of blood vessels, for maintaining biological function throughout an organism.