Capillaries

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

Endothelial cells also known as epithernal tissue.

the four or more functions of the capillery network in the skin?

It's called capillarization and means that every cell of your body organs/ tissues is getting blood supply for it to function properly by getting nutrients and oxygen from blood as well as eliminating waste products/toxins

Sinusoidal Capillaries

Oxygen and carbon dioxide pass across the Alveolar-capillary barrier. This is the barrier that separates the air sac in the lung (the alveoli) from the miniscule blood vessel (the capillary). The barrier is extremely thin - a hundred times thinner than a regular piece of paper. Follow the Related Links below to view a Wikipedia article on this subject.

ARTERIES carry blood TO the capillaries throughout the body, whereas VEINS carry blood FROM the capillaries and back to the heart.

Tip for rememering: A-->V (alphabetical order: arteries-->veins)

it comes in arterial blood and leaves as venous blood

LOL read the textbook

Veins

A capillary has a very narrow lumn and very thin wall. These features maximize diffusion of nutrients, wastes, and oxygen.

Tunica Intima

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.

nose - nasal cavity - larynx - trachea - primary bronchus - secondary bronchi - tertiary bronchi - terminal bronchi oles - respiratory bronchioles - alveoli - alveolar sacs

the alveolar sacs contain the pulmonary capillaries. the actual gas exchange occur here by simple diffusion. O2 goes from the lungs into the O2 depleted RBC.

oxygen has to pass through them to make blood rich

If their walls are too thick, substances like oxygen and nutrients and waste cannot pass across the cells into or out of the body.

The Capillary tube metering device is used primarily on small fractional-horsepower refrigeration systems that have relatively constant evaporator heat loads.

These systems are hermetically sealed, leak free systems with dry-type evaporators that use a minimum of refrigerant.

The capillary tube metering device is a fixed bore device, itcontrols refrigerant flow by pressure drop.

Due to surface tension of water the component T cos @ acting all along the circumference of the capillary tube 2 pi r would get added as 2 pi r T cos@. Here @ is the angle of contact of water with the material of the tube ie glass.

Hence this uplifts the water to a height till its weight gets balanced by 2 pi r T cos@.