Peritubular Capillary Beds
peritubular capillaries
You have portal system of blood circulation in case of kidney tubules. In portal system, you have afferent arterioles, divided to form primary capillaries and capillaries reunite to form efferent arterioles. The efferent arterioles again divide to form the secondary capillaries. So you have secondary capillaries, there in urinary system, to receive the substances, directly from tubular cells.
The myocardium receives blood from the coronary arteries.
The cornea, the clear part of the eye, does not contain blood vessels and it receives oxygen supply directly from the air.
light energy
The cornea contains no blood vessels because it is retaining transparency is the most important thing. Since there is no blood supply, the cornea receives oxygen directly from the air.
no, pericardial fluid is only made to protect the heart from friction. The heart receives its oxygen and nutrient supply from the coronary arteries which branch directly off the aorta.
yes
Hygiene Supply Direct seems to be a good source to buy a tubular heater. Another resource would be Dimplex, which is a company in the United Kingdom. These two companies seem to have good reviews on their products.
Radial
ATP and NADPH
food oxygen