astrocytes
This is known as an astrocyte
respiratory membrane
Astrocytes are star-shaped neuroglia that form the blood brain barrier between blood vessels and neurons.
blood-brain barrier (!)
Blood capillaries are surrounded by a layer called the basement membrane, which provides structural support and acts as a barrier between the capillaries and surrounding tissues. Pericytes, contractile cells that regulate blood flow and vessel stability, may also be found surrounding blood capillaries.
Yes, neuroglia help regulate extracellular fluid composition by assisting in the maintenance of ion concentrations, pH balance, and nutrient delivery in the brain and spinal cord. Astrocytes, a type of neuroglia, play a crucial role in this physiological regulation by creating a barrier between the blood vessels and the neurons.
Air sacs; blood vessels that surround the air sacs
The capillaries are in between the red and blue veins :)
capillaries between the cells in the lungs or the capillaries between the cells in the body
Yes, the capillaries in the brain are indeed the least permeable compared to those in the rest of the body. This is primarily due to the presence of tight junctions between endothelial cells, which form the blood-brain barrier. This barrier restricts the passage of substances, thereby protecting the brain from potentially harmful compounds while allowing essential nutrients to pass through.
Lymphatic capillaries are dead-end vessels interspersed between the vascular capillaries. They lack tight junctions between endothelial cells and therefore are more permeable to proteins than are vascular capillaries.
Neurons conduct electrical impulses in the brain. Neuroglia are cells that support the neurons. These cells undergo mitosis where neurons do not. Brain tumors are formed from neuroglia cells because they mitosis.