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They are called capillary vessels. Some are so narrow that hemoglobin cells have to queue to go through them.
The smallest type of blood vessel is the capillary. Its walls are one cell thick and permeable, for substances to transfer out of the capillary and into the cells (and vice versa).
because it has very small lumen
Because the glucose in capillary blood is not fully delivered to the cells yet. Once the blood leaves the capillary and enters the vein, the glucose has then been delivered to the cells and the blood is considered used.
The blood cells must move through the capillaries in a single file line because the diameter of the capillary is only slightly larger than the diameter of the blood cells - there isn't room for two blood cells to go through side by side.
The round cells that move in the blood capillaries are called RED BLOOD CELLS.
I Believe so
they squeeze through capillary walls in a process called diapedesis
Capillary
Red blood cells are concaved (dented) to increase surface area. Their shape also allows them to bend and squeeze into and through those tiny little capillary blood vessels.
Capillary endothelium
Capillaries, which are only one cell thick. The walls are semipermeable to the cell membranes in the body and are so narrow that red blood cells must pass through in a line, one behind the other. Oxygen and nutrients diffuse from the capillary to the body cells at the arterial end of the capillary while CO2 and other metabolic wastes enter the capillary at the venous end, because of diffusion gradients between the cell and the plasma and cells in the capillary.