colloid

Examples of colloid in the following topics:

• Plasma and Blood Volume Expanders

  • There are two main types of volume expanders: crystalloids and colloids.
  • Colloids contain larger insoluble molecules, such as gelatin; blood itself is a colloid.
  • Colloids: These solutions preserve a high-colloid osmotic pressure (protein-exerted pressure) in the blood, while this parameter is decreased by crystalloids due to hemodilution.
  • The higher osmotic pressure from colloids draws fluids inward, preventing it from leaking out into the tissues as easily, which increases intravascular blood volume.
  • Another common volume expander includes hydroxyethyl starch (HES/HAES, common trade names: Hespan, Voluven) which is considered a colloid.

• Bulk Flow: Filtration and Reabsorption

  • Capillary fluid movement occurs as a result of diffusion (colloid osmotic pressure), transcytosis, and filtration.

• Formation, Storage, and Release of Thyroid Hormones

  • This enlarged endemic colloid goiter has the effect of increasing the thyroid's ability to trap more iodide, compensating for the iodine deficiency and allowing it to produce adequate amounts of thyroid hormone.

• Capillary Dynamics

  • Oncotic, or colloid osmotic, pressure is a form of osmotic pressure exerted by proteins in the blood plasma or interstitial fluid.

• Physical Characteristics and Volume

  • Albumin is the main protein found in plasma, and it functions to regulate the colloidal osmotic pressure of blood.