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Blood Flow01:29

Blood Flow

Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
Fluid Connective Tissues: Blood and Lymph01:20

Fluid Connective Tissues: Blood and Lymph

Blood and lymph are fluid connective tissues. They contain cells, also known as formed elements, circulating in a liquid extracellular matrix, the plasma. The formed elements are derived from hematopoietic stem cells in the bone marrow. Blood and lymph connect all vital parts and carry nutrients, oxygen, and other essential molecules like antibodies.
Blood
The blood flows through blood vessels— arteries, capillaries, and veins. Blood plasma is primarily made of proteins, solutes, and water.
Overview of the Cardiovascular System01:14

Overview of the Cardiovascular System

The cardiovascular system is a vital transportation system in the body. It comprises the heart and blood vessels and facilitates the exchange of gases, nutrients, and waste products.
Heart
The heart is the central pump of the cardiovascular system that circulates blood throughout the body. It comprises two atria receiving the blood and two ventricles pumping blood out of the heart. Their rhythmic contractions, called heartbeats, ensure that blood flow remains continuous.
Blood Vessels
Blood...
Characteristics and Functions of Blood01:26

Characteristics and Functions of Blood

Blood is specialized connective tissue comprising about 8% of the body mass. It has a thick, liquid extracellular matrix that contains cells, dissolved proteins, and electrolytes, making it five times more viscous than water. Blood is warm, around 38°C, and has an alkaline pH ranging from 7.35 to 7.45.
The primary function of blood is to transport oxygen and carbon dioxide between tissues and the lungs. Oxygenated blood is bright red, while oxygen-depleted blood is darker. It also carries...
Blood Transfusion01:15

Blood Transfusion

Blood transfusion is a critical medical procedure that saves lives and treats various medical conditions. It involves transferring blood from a donor to a recipient. This process requires a thorough understanding of the ABO blood group system and its associated antigens and antibodies.
Blood Transfusion Overview
A blood transfusion is a medical procedure used to replace blood lost due to injury, surgery, or to treat conditions such as anemia or cancer. During a transfusion, donor blood is...
Anatomy of Blood Vessels01:20

Anatomy of Blood Vessels

The vascular system, an integral part of the circulatory system, comprises various blood vessels that play crucial roles in maintaining the body's homeostasis. These blood vessels form a complex and efficient circulatory network. The three primary categories of blood vessels are the arteries, veins, and capillaries.
Arteries
Arteries circulate oxygenated blood from the heart, except the pulmonary artery, which transports deoxygenated blood to the lungs. Large arteries, such as the aorta, have...

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Real-time Cytotoxicity Assays in Human Whole Blood
08:27

Real-time Cytotoxicity Assays in Human Whole Blood

Published on: November 7, 2014

La sangre en trastornos sistémicos.

J L Spivak1

  • 1Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA. jlspivak@mail.jhmi.edu

Lancet (London, England)
|July 25, 2000
PubMed
Resumen
Este resumen es generado por máquina.

La médula ósea es la médula ósea.

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Área de la Ciencia:

  • Hematología Hematología.
  • Medicina interna es la medicina interna de las enfermedades.
  • Fisiopatología Fisiopatología.

Sus antecedentes:

  • La alta tasa de proliferación de la médula ósea la hace vulnerable a factores externos.
  • La anemia es una anomalía hematológica común en los trastornos sistémicos.
  • Comprender las diversas causas de la anemia es crucial para un manejo eficaz.

Objetivo del estudio:

  • Revisar las causas multifacéticas de la anemia en enfermedades sistémicas.
  • Para resaltar el papel de la eritropoyetina y los factores endocrinos.
  • Para discutir la anemia asociada con enfermedades crónicas, infecciones y tumores malignos.

Principales métodos:

  • Revisión de la literatura sobre la anemia en trastornos sistémicos.
  • Análisis de los mecanismos fisiopatológicos.
  • Evaluación de las respuestas al tratamiento.

Principales resultados:

  • La anemia de la enfermedad crónica implica una reducción de la eritropoyetina y un deterioro en la proliferación de las células progenitoras eritroides.
  • El estado endocrino es crítico en la anemia normocítica y normocrómica.
  • La anemia en la infección se debe a factores de huésped, parásito o tratamiento.
  • La anemia asociada a la malignidad a menudo responde al tratamiento con eritropoyetina, y la falta de respuesta indica un mal pronóstico.

Conclusiones:

  • La anemia en los trastornos sistémicos es compleja, influenciada por los procesos de la enfermedad, la función endocrina, la infección y la malignidad.
  • La terapia con eritropoietina es una consideración clave, particularmente en la anemia de enfermedades crónicas y tumores malignos.
  • Abordar las condiciones subyacentes es esencial para manejar la anemia de manera efectiva.