usually there is only one capillary bed between an artery and a vein except?
919741
The exception is Portal circulation. This is where venous blood goes between two capillary beds. this happens in the liver as part of portal circulation, and between the hypothalamus and the pituitary gland.
935401
Heart, arteries, veins.
735962
It happens when you press the blood vessels and the blood supply is cut off momentarily. Better keep your hands free and do not put pressure on them by putting it under your head or keeping them hard pressed between your thights etc. More suggestions only if you can tell which way you sleep. \n\nIf it persists, consult a physician
260629
The heart muscle, like every other organ or tissue in your body, needs oxygen-rich blood to survive. Blood is supplied to the heart by its own vascular system, called coronary circulation. \n\nThe aorta (the main blood supplier to the body) branches off into two main coronary blood vessels (also called arteries). These coronary arteries branch off into smaller arteries, which supply oxygen-rich blood to the entire heart muscle.\n\nThe right coronary artery supplies blood mainly to the right side of the heart. The right side of the heart is smaller because it pumps blood only to the lungs.\n\nThe left coronary artery, which branches into the left anterior descending artery and the circumflex artery, supplies blood to the left side of the heart. The left side of the heart is larger and more muscular because it pumps blood to the rest of the body.
1002860
a closed circulatory system is the type humans have.the blood flows through the blood vessels like arteries,veins and capillaries.in an open system,the blood vessels are either completely absent or not completely closed.
1044583
I have the same problem..it started when I was pregnant..After I delivered the swelling went away but the veins were damaged. Anyway, one doc told me the reason for it being on the left is something to do with with heart being further away and a certain artery that runs through your left leg... I would go get it checked out if I were you.
295157
the major parts of circulatory system are heart and blood vessels.\nthe blood vessels are of three types-1. arteries \n2. veins\n3. capillaries\nthe arteries carry blood mainly oxygenated blood from heart to different parts of the body.\nthe veins carry deoxygenated blood from all parts of the body to heart.\ncapillaries connect the arteries and veins...they are thin walled and allow the exchange of gases to occur across their walls.
521736
The answer is A: arterioles\n\nArterioles are small branches of arteries (a vessel that carries blood high in oxygen away from the heart to the body) leading to a capillary. The oxygenated hemoglobin (oxyhemoglobin) makes the blood in arteries and arterioles look bright red.\n\nVenules, on the other hand, connect capillaries to veins, which carry blood low in oxygen content from the body back to the heart. The deoxygenated form of hemoglobin (deoxyhemoglobin) makes the blood in veins and venules appear dark. Veins and venules are part of the afferent wing of the circulatory system which returns blood to the heart.
16348
The heart is a double pump with four chambers, each separated by valves that only permit blood to flow in one direction. Basically, the right side of the heart pumps deoxygenated blood to the lungs, while the left side pumps oxygenated blood to the body.
1179224
There are two possible answers.  Are you referring to the oxygenated blood pathway and the deoxygenated blood pathway or the arterial and venous pathways?  In either case, here is a quick rundown. \n\nThe pathway of oxygenated blood:\nStarting in the lungs:  Pulmonary capillaries, pulmonary venuoles, pulmonary veins, to the left atrium through the mitral valve to the left ventricle, through the aortic valve to the aorta, the arteries, the arterioles and to the systemic capillaries throughout the body.\n\nThe pathway of deoxygenated blood:\nStarting in the systemic capillaries, the venules, veins, then into the right atrium from either the superior vena cava, inferior vena cava or the coronary sinus, then through the tricupid valve into the right ventricle, through the pulmonary valve, the pulmonary arteries, pulmonary arterioles, and into the pulmonary capillaries of the lungs. \n\nArtery Pathway:  Pulmonary Arteries, Coronary Arteries, Aorta, Common Cartoid Artery, Subclavian Artery, Auxillary Artery, Brachial Artery, Radial Artery, Ulnar Artery, Brachiocephalic Artery, Common Iliac Artery, Internal Iliac Artery, External Iliac Artery, Femoral Artery, Popliteal Artery, Anterior Tibial Artery, and Posterior Tibial Artery\n\nVenous Pathway:  Pulmonary Veins, Cardiac Veins, IVC, SVC, Internal Jugular Vein, Subclavian Vein, Auxillary Vein, Brachial Vein, Radial Vein, Ulnar Vein, Brachiocephalic Vein, Common Iliac Vein, Internal Iliac Vein, External Iliac Vein, Femoral Vein, Popliteal Vein, Anterior Tibial Vein, and Posterior Tibial Vein
437074
During a heart attack, there is a blockage in a blood vessel in your heart.  Part of you heart doesn't get blood and oxygen, so it dies.  In a stroke, there is a blockage in a blood vessel in your brain.  Part of your brain can't get blood and oxygen, so it dies.  In serious cases, the blood vessel can actually burst open.  In either case, you've got serious problems.
560918
The blood vessels fill up
720307
The answer to this question might vary depending upon which vessel we are talking about. For example the jugular vein is huge in diameter when compared to any arteries. But mostly arteies are bigger and stronger. the main reason behind this is that te pressure in the arteries is huge. they also have cup valves at regular intervals which ake them even bigger. they have thick walls which make them retain their cylindical shape even when there is no blood flowing. But the weaker walls in the vein make them collapse when there is no blood. All these cause the arteries to appear and in most of the cases to actually be Bigger than Veins.
1066504
I believe the only ones you can tell are the superficial blood clots, which means they are closer to the surface.  It will be tender, possibly a lump and it could be red around the area.  If you believe that you may have one you should go to the doctor.
386792
The vena cava presure is zero because that is what is used to define zero. Strictly speaking the right atrium, I think, I am wide open to correction on this.\nThe paired figures are systolic (peak during heart contraction) and diastolic (minimum between heart beats).\nThe pressure is lost as the flow is forced through the vessels (due to viscosity and presumably work expended irreversibly on the artery walls).  Great loss occurs in the narrow arterioles to regulate flow through the capillaries.\nThe small pressure at the arterial end of the capillary has lost the pulsation effect.  The pressure at the venous end of the capillary is even less, to allow interstitial fluid back in.\nRight heart/pulmonary circulation is less pressure than left heart/systemic curculation, presumably to protect the delicate alveolar capillaries.\nTry a Physiology book, rather than Anatomy!\nAdded later - as stated above the second figure, the diastolic pressure is that between contractions of the heart, hence it is zero in the ventricle as the heart is not contracting at the time.  The diastolic pressure in the pulmonary artery does not return blood back to the ventricle due to the semilunar valves. The same would apply to the Left ventricle as the Right. \nThis pressure cannot truly be zero or the ventricle would not fill, in my humble opinion!
875233
It means that there is a trivial amount of backflow of blood thru both of these valves. The abnormal flow of blood is backwards from the ventricles back to the atria, I use the pleural because it involves 2 valves. Only you know if this medical information will keep you off the force, and since it is so small, it may not even show up as a heart murmur. To put your mind at ease you would want to talk to a doctor, but it does not sound like it is a problem currently. Check back when you get older as heart valves tend to get stiffer, and calcify with age and this may become a larger leak as you age.
636642
backflow may occur where some of the blood goes backwards, leading to a slow circulation