Capillaries

astrocytes

Capillaries connect the smallest branches of arteries and veins The walls of capillaries are just one cell thick. Capillaries therefore allow the exchange of molecules between the blood and the body's cells - molecules can diffuse across their walls. This exchange of molecules is not possible across the walls of other types of blood vessel.

No, broken capillaries will not go away on their own. There is an easy way to get rid of them, but it is not for the squeamish. Use a very sharp blade of some sort to make a small incision into the capillary. You will know if you got it, because blood will gush out (not heaps of blood, just more than would come out if you had made an incision on a normal part of skin without a broken capillary). Then wait for the cut to heal, and your broken capillary will be gone.

To increase the surface area of which the products of digestion can diffuse across (into the blood)

The walls of capillaries are made of one cell cell layer so it is a small diffusion barier. They have the greatest total cross-sectional area and the slowest velocity of blood flow. This enhances exchange.

Arteries carry oxygenated blood away from the heart, to the cells that need them.

Veins carry blood containing carbon dioxide back to the heart after the oxygen has been given to the cells.

Capillaries are the thinnest arteries and veins. They are only one cell wide. As the blood cell passes through the very thin capillary, the cells on either side are given oxygen and carbon dioxide is taken from them. Therefore, the capillaries connect the arteries and veins.

Veins are thinner than arteries. Arteries are thicker than capillaries.

Capillary in the villi are used to absorb the digested food and transport the food the the destination cell.

Pressure at capillary bed varies from 32mmHg at the arteriolar end to about 10mmHg at venous end, with an average of 17mmHg

In the body, capillary tubes are in fact microscopic. However, the capillary effect can be viewed on a much larger scale. If one was to place a straw in a glass of water, one would see that the water level in the straw is higher than that of the glass of water, this is because the molecules of water are attracted to the wall of the straw, and each other.

Blood leaves the glomerular capillaries via a second set of arterioles, the efferent arterioles, which deliver blood to the peritubular capillaries.

Veins are bigger (:

It is unique from other capillary beds in that it is supplied with and drained by arterioles, the afferent arteriole and efferent arteriole, respectively.

Cardiac Vein

Capillaries are very small blood vessels which act as the transporting medium between the oxygenated blood in the arteries (excluding the pulmonary) and the deoxygenated blood in the veins. As they are so small of approximately 5-20 micro-metres in diameter, they do not need valves, as there is a distinct flow from the arterioles supplying the capillary with blood, and the venules draining the capillary within the double circulation.

Capillaries are tiny thin-walled blood vessels that connect the smallest arteries and veins and allow the exchange of nutrients and waste between the blood and tissues. Oxygen and carbon dioxide are exchanged between the circulatory and respiratory systems; oxygen diffuses from the lungs into the bloodstream and is transported by erythrocytes (red blood cells) throughout the body. Carbon dioxide diffuses out of the blood into the alveoli and goes the reverse direction through the respiratory system and out the nose.

The walls of capillaries are very thin allowing the nutrients of cells to diffuse through them. They facilitate the diffusion of nutrients to the body by passing them through their cell walls.

Alveoli which are in your lungs

They are found because they have to bring oxygen and nutrients from the veins and arteries to all of the cells. They remove waste (carbon dioxide) from the cells and drop it off at the lungs. Therefore, that's when breathing occurs and the cells get oxygen and do the cycle over and over.

A capillary has a small diameter, which slows the flow of blood. In addition, it has a very thin wall. Together, these structural features facilitate its function of gas and nutrient exchange with the tissues.

Liquid rises in and out of cappilarry to compansate pressure difference.

Rise of a liquid in capillary is indirectly proportional to radius of tube so liquid goes higher in a narrow tube.

This capillary network surrounds the tubules and plays an important role in secretion and reabsorption, plus it delivers oxygen to kidney cells.

A hemangioma is a benign tumor that can involve the body of the vertebra. This tumor is often found in the lower thoracic or upper lumbar spine, usually involving only a single vertebra. Interestingly, not all hemangiomas produce symptoms such as pain. Hemangiomas typically occur during mid-life, affecting females more often than males. The most common symptom associated with a hemangioma is pain. This is typically the result of a large hemangioma involving the entire vertebral body. Hemangiomas may be discovered as part of an evaluation for back pain. They have a very characteristic appearance on regular x-rays, referred to as " honeycombing." There may also be a varying degree of collapse and loss of vertebral height with extensive involvement. When the collapse is severe, impingement on the spinal cord or neural elements will produce severe pain and loss of function in the legs, bowel or bladder. There are a number of treatment options for vertebral hemangioma, ranging from observation to radiation to surgical resection. Treatment decisions are based upon the severity of symptoms or neurologic compromise. The management of a vertebral hemangioma must take into account the generous blood supply of the lesion, and requires careful planning by the surgeon involved in your care before surgical treatment is recommended.
: A hemangioma is an abnormal build up of blood vessels in the skin or internal organs. 1. A vascular tumor, present at birth or developing during life, in which proliferation of blood vessels leads to a mass that resembles a neoplasm; hemangiomas can occur anywhere in the body but are most frequently noticed in the skin and subcutaneous tissues; most hemangiomas present at birth undergo spontaneouos regression. dr.sohaib al adawi

smple epithelium

osmotic and hydrostatic forces

Capillaries are very thin and therefore allow the substances to be diffused out of the thin layer of vein/artery. They are also very small and allow for a smaller amount of blood cells to be transported at one which helps to slow them down (also they are further away from heart) and deposit their substances to each cell.