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Veins are near the surface of the skin to facilitate the exchange of oxygen and nutrients between the blood and surrounding tissues, as well as to regulate body temperature by releasing heat. Additionally, having veins close to the surface allows for easier access for medical procedures such as blood draws and intravenous injections.
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What promotes varicose veins?
Varicose veins are veins under the skin of the legs, which have become dilated and tortuous. They are very common.Blood flows down the legs through the arteries, and back up the legs through the veins. There are two main systems of veins in the legs - the deep veins which carry most of the blood back up the legs to the heart, and the superficial veins under the skin, which can form varicose veins. All these veins contain valves which should only allow the blood to flow towards the heart. Failure of these valves allows blood to flow backwards down the veins and increase pressure when standing. This excess pressure leads to dilation of the veins and the appearance of varicose veins.What causes varicose veins?Varicose veins and spider veins often run in families. Hormonal factors including pregnancy, menopause, the use of birth control pills and HRT also affect the condition. Other predisposing factors include ageing, standing occupations, obesity and leg injury.What are the symptoms?Other than cosmetic embarrassment the commonest symptoms from varicose veins are aching, discomfort, and heaviness of the legs, which are usually worse at the end of the day. Sometimes the ankle can swell too. Elevating the legs and wearing support stockings can help to alleviate the symptoms.ln a few people the high pressure in the veins causes damage to the skin near the ankle, and a red skin rash can develop. lf these skin changes are allowed to progress, or if the skin is injured, an ulcer may result.Other problems which varicose veins can occasionally produce, are superficial thrombophlebitis (inflammation of the veins) and bleeding.What is the treatment?The only way to get rid of varicose veins is with surgery or more recently, endovenous laser therapy or ultrasound guided sclerotherapy.www.specialistvascularimaging.com
Why do water milfoil leaves only present near surface of water?
Varieties of water milfoil that have leaves only present near the surface of the water do so as an adaptation to available light. Only the top of a plant in murky water gets light, so it saves energy for the plant to not have too many leaves.
Photosynthesis can take place only near the surface of a very deep body of water.?
False.
What type of root system does lemongrass have?
Lemongrass typically has a fibrous root system, consisting of thin, branching roots that spread out near the surface of the soil. These roots help the plant efficiently absorb nutrients and water from the surrounding soil.
Where is capillaries location?
it is in your wrist
What is varicosity veins?
Varicose veins are veins that are swollen and sometimes painful. They may also be twisted and can have more blood in them then normal.
Are visible veins hot?
If they're visible, they're near the surface, and probably are indeed warmer than surrounding tissue.
What is superficial meen?
Being at, on, or near the surface
What is the preferred site for a blood draw?
The usual location is the inside of the elbow, where veins are near the surface and larger than the ones found in the wrist.
What are the finest blood vessels?
Capillaries are the small blood vessels that are near the surface of the skin. They connect arterioles and venules, and they are the smallest blood vessels in the body.
Where is the place of 3 kinds of blood vessels?
Three kinds of blood vessels: Arteries - Generally pump blood from the heart (Except the pulmonary artery) Veins - Carry blood to the heart Capellaries - between cells and arteries and veins. Arteries tend to be deeper within limbs and torso, while veins run nearer the surface. Veins running near the surface can cool blood. Getting rid of heat is a big problem for the human body.
What is varicosities?
Varicose* veins are twisted, enlarged veins near the surface of the skin. They are most common in the legs and ankles. They usually aren't serious, but they can sometimes lead to other problems.
What do you call the patter of viens does a dicot leaf have?
The patten of veins on a dicot leaf are called netted veins. With netted veins, several main veins begin near the base of the leaf and radiate outward.
How do you rocks get weathered?
We get weathered by being on or near the surface and exposed to environments different than we were formed in.
Where are your veins located?
Veins can be found in different parts of the body. Veins in the hands called metacarpal veins, median arch vein, basilic, ulnar vein, brachial, veins in the feet and the back, near gastronemius muscle.
Why is it important for a photosynthetic organism such a diatom to live near the surface of a body of water?
Diatoms need sunlight for photosynthesis to produce food and energy. Living near the surface of the water allows them to access the necessary sunlight for this process. Additionally, being near the surface helps diatoms avoid being blocked from sunlight by other organisms or debris in the water column.
Where the veins are located?
If you're over 40, you probably see them; those little purple veins that suddenly seem to appear on your legs. Veins are the soft, thin-walled tubes that return blood from the arms and legs to the heart. Because veins work against the force of gravity, they have valves that allow forward blood flow, but not reverse. Your legs and arms have two major types of veins: superficial and deep. The superficial veins are near the surface of the skin and are often visible. The deep veins are located near the bones and are surrounded by muscle. Connecting the deep and superficial veins is a third type of vein, the perforator vein. Contraction (squeezing) of the muscles in the arms and legs with exercise helps blood flow in the veins.Varicose veins are enlarged, bulging superficial veins that can be felt beneath the skin, generally larger than 3-mm in diameter. They are usually located on the inside of the calf or thigh and develop due to weakness of the vein wall and loss of valve function. Under the pressure of gravity, they continue to enlarge, and in the course of time, they may become elongated, twisted, pouched, and thickened.Spider veins or telangiectasia are tiny dilated, veins, usually less than 1-mm in diameter, located at the surface skin layers. Spider veins cannot be felt. Veins larger than the spider veins, but still under 3-mm are called reticular veins.
