Cell fragments called platelets, or thrombocytes, make up about 2 percent of blood. Platelets stop blood loss from damaged vessels. When a blood vessel tears, platelets at the site adhere to the wall of the vessel to close the tear. The shape of the platelets changes as they liberate the contents of their vesicles. This […]

Read More »

injerto de piel

Excisión de lesión e injerto de piel

Los injertos de espesor parcial constituyen el método más simple de reconstrucción superficial en la cirugía plástica. Muchas de las características de dichos injertos dependen de la cantidad de dermis presente. Menos dermis se traduce en menos contracción primaria (el grado en el cual el injerto disminuye sus dimensiones después de la recolección y antes […]

Read More »



When bacteria or other pathogens are present in the body, certain white blood cells categorized as phagocytes consume the microorganisms to protect the body from infection. The process of consuming the pathogen begins when the phagocyte is attracted to chemicals from the pathogen, and through receptors, binds to it. The phagocyte ingests the microbe, encasing […]

Read More »

reparacion inguinal

Reparación de hernia inguinal

La reparación de hernia inguinal es una de las intervenciones quirúrgicas que se realizan más a menudo, los avances en la anestesia perioperatoria y la técnica quirúrgica han hecho de ésta un procedimiento ambulatorio, con tasas bajas de recurrencia y morbilidad. Dado este éxito, la calidad de vida y la evitación del dolor crónico se […]

Read More »

red blood cells

Red blood cells

The bloodstream delivers oxygen to cells and removes carbon dioxide waste through a process called internal respiration. In the lungs, oxygen is absorbed into the erythrocytes in the blood stream. These cells, commonly called red blood cells, contain gas-transporting molecules called hemoglobin. Oxygen binds to these molecules. The oxygenated blood then moves through the vasculature. […]

Read More »

Bone Repair

Bone repair

A fractured bone bleeds. Bone repair begins, as over a period of hours blood at the fracture site clots and forms a hematoma. The healing begins as osteoclasts in the area remove dead bone tissue, while fibroblasts penetrate the area and build a fibrocartilaginous callus that bridges the broken bone. Over many weeks osteoblasts transform […]

Read More »

sound production

Sound production

Phonation is the production of sound by structures in the upper respiratory tract. During exhalation, air passes from the lungs through the larynx. Muscles in the larynx can act to move the arytenoid cartilages that then move the cords. The cords are pushed together and air passes between them in such a way as to […]

Read More »

nurients absortion

Nutrient absorption

Mechanical and chemical digestion in the stomach results in chyme. Peristaltic waves propel chyme through the pyloric sphincter into the duodenum of the small intestine. Finger-like projections called villi line the interior wall of the small intestine. Most absorption of nutrients from ingested food occurs through these. In the small intestine, nutrients in the chyme […]

Read More »



The process of hearing involves sound waves creating mechanical motions that cause fluid in the ear to move in waves and trigger nerve impulses that the brain interprets as sound. The outer ear functions to funnel sound waves. The vibrations from these waves reach the middle ear and move the tympanic membrane, often called the […]

Read More »