Capillaries

Capillaries are the connection between arterioles and venules.

The capillaries job is to enable the exchange of oxygen, water, carbon-dioxide, chemical substances and various nutrients to between blood and the surrounding tissue.

yes while oxygen then diffuses into the blood, and carbon dioxide diffuses out. it's a chain

Water uses capillary action to "climb" up plant vessels through cohesion and adhesion, which allows the water to be transported throughout the plant.

This is really a biology question.

The general gist of it is that every cell in your body needs nutrients and oxygen, and give off waste products and carbon dioxide. Imagine making a flat sheet of cells (pack them in real tight for efficiency). The area of that sheet would be an estimate for the number of square miles of capillaries needed to feed them all.

Another way of estimating is think of slicing your body into sheets that are as thick as one cell, see how many sheets that would be, and multiplying by the area of that cross-section. This would be a rough estimate (very very rough) but it might be fun.

The diameter of the afferent renal arteriole narrows progressively more and more into the glomerular capillaries, with the same blood flow, leading to an increase in pressure within the glomerulus. This is so that the high pressure can force solutes and water across into the Bowman's capsule for the renal tubules.

Through diffusion. There is less oxygen in the cells as opposed to the capillaries, so through simple diffusion, the oxygen goes from an area of high concentration to lower concentration.

Arteries and veins have much thicker walls compared to capillaries. The largest arteries and veins have walls up to 5 mm thick, while capillaries have walls that are only one cell layer thick.

Capillary exchange- exchange of gases- internal or tissue respiration

The single cell layer of capillaries, although ideal for diffusion, creates problems. Capillary beds are easily destroyed. High blood pressure or any impact, such as caused by a punch, can rupture the thin-layered capillary. Bruising occurs when blood rushes into the spaces vetween tissues.

they are related to air sacs because they both use specialized epithelial tissue. This tissue is only one cell layer thick.

A capillary is a small blood vessel in the body that branches off from the larger veins. The capillaries help get blood to the other parts of the body like the fingers and toes.

Diapedesis

The liquid rises up due to the forces of adhesion between the capillary and liquid..

It rises till the extent when adhesive and cohesive forces and external forces balance each other...

A crude estimate using fluid dynamics gives 1.92x10^9. So around 2 billion.

However, this source says the normal range of physiological estimates is 3.2×1010-4.2×1010, which is 32 to 42 billion (http://www.springerlink.com/content/7x55l04161513q15/)

capillary is just a scientific word for roots

the smallest vessales that form an extensive network of vessels in the body organs, connecting arteries to veins.

Valves in veins are one way valves in the tunica intima(endothelium) of the drainage vessel. They allow the blood to defy gravity and continue circulating up towards the heart to dump into the inferior/superior vena cava. They ensure that blood travels the direction it is supposed to, and does not fall back the wrong way. Lymphatic capillaries are part of the capillary exchange that occurs from artery->artierole->CAPILLARY DIFFUSION->venule->vein->heart. they are an accessory drainage system, beginning blindly in the body and eventually meeting up with the vein again.

A high metabolic rate means that the cells in the tissue will require a high rate of gas exchange as the cells will be producing a high amount of CO2 during energy production. The dense network of capillaries ensure that the cells are adequately provided with oxygen.

i was just looking for the answer to this question for my science homework, and found the answer, and here it is....

Oxygen

Water

Carbon dioxide

Nutrients

waste chemicals :)

Diffusion

The kidney's function in filtration. The renal tubules located with in the kidney's and also known as nephrons, are the functioning units of the kidney's. Blood carries nutrients and waste. The renal tubules are surrounded by a capillary network so the blood can expel the waste material that is collects from the body. the renal tubules also replace nutrients and water that is still needed back into the capillaries.

Pressure. Capillaries are small so the force of blood coming from the heart is at greater pressure when it reaches the tiny capillaries. Pressure forces the diffusion of particles in and the osmotic diffusion of substances out (mainly metabolic wastes) to the veins.

• As blood enters the capillary bed on the arteriole end, the blood pressure in the capillary vessel is greater than the osmotic pressure of the blood in the vessel. The net result is that fluid moves from the vessel to the body tissue.
• At the middle of the capillary bed, blood pressure in the vessel equals the osmotic pressure of the blood in the vessel. The net result is that fluid passes equally between the capillary vessel and the body tissue. Gasses, nutrients, and wastes are also exchanged at this point.
• On the venue end of the capillary bed, blood pressure in the vessel is less than the osmotic pressure of the blood in the vessel. The net result is that fluid, carbon dioxide and wastes are drawn from the body tissue into the capillary vessel.

diffusion