because they are too big to pass through the capillaries
Red blood cells and larger proteins, such as albumin, should not normally pass into Bowman's capsule during the process of filtration in the kidneys. These components are retained in the bloodstream as they are too large to pass through the filtration membrane.
Hydrophilic proteins.
Blood proteins and blood cells are indeed too large to pass through the filtration membrane in the kidneys. During the process of filtration in the kidneys, small molecules like water, electrolytes, and waste products are filtered into the urine, while larger molecules like blood proteins and cells remain in the blood. So, they should not normally be found in the filtrate that is eventually excreted as urine.
Large molecules such as proteins, blood cells, and platelets are normally unable to pass through the glomerular walls due to their size. Additionally, negatively charged particles like albumin are also restricted from passing through as they are repelled by the negatively charged basement membrane of the glomerulus.
what veins does it pass through
Proteins do not pass through plasma membranes because they are too large and complex to fit through the small pores of the membrane. Additionally, the membrane is selective in what it allows to pass through, and proteins typically require specific transport mechanisms to enter or exit the cell.
Oxygen and other gases pass through the capillaries.
Large proteins like albumin and clotting factors are unable to move into the filtrate due to their size. Red blood cells and white blood cells are also too large to pass through the filtration barrier and remain in the blood.
glucose and proteins
cholesterol
The oxygen is passing from through the walls of the capillaries and the organs' walls. There are specially designed proteins which are allowed from the cell, to pass through the cell's wall (membrane).
Globular proteins.