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What structure within a capillary bed shunts blood from arteriole to venule?
Wiki User
∙ 14y ago
Artery -> Arteriole -> Capillary -> Venule -> Vein
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∙ 14y ago
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What does the venous return depend on?
The veins act as a blood reservoir, because of the ease of distending them. 55-60% of blood is in systemic veins which is important for blood pressure. The volume of blood returned to the right atrium of the heart per minute is called the venous return. Generally venous return is equal to cardiac output, due to the closed system of the circulation, except for minor transient periods. A number of factors affecting the venous return are: Smooth muscle: Due to presence of smooth muscle, the diameter of the veins can be altered by sympathetic discharge(normally vasoconstrictive), adrenaline and angiotensin II (cause venoconstriction). But because the diameters of veins are large, venoconstriction has little effect on peripheral resistance. Elasticity of the heart: If the elasticity decreases, then the ability to fill the heart is reduced. valves: one way valves in the veins (not in large veins) ease blood flow to heart. Muscle pump: When muscles, particularly leg muscles contract, the thin walled veins are squeezed and the blood is forced towards heart, when muscles relax, blood enters the veins, but only from the arterial side. This is an important mechanism for facilitating venous return. Respiratory pump: Breathing in causes negative pressure in thorax causing a suction effect, i.e. the pressure gradient pushing blood towards the right atrium is increased, thus more blood returns to the heart, which means that inspiration leads to an increase in venous return. The opposite occurs with expiration, and venous return is decreased. Gravity: Opposes return of blood from the periphery during sitting or standing. The effect is lost when we lie down. Blood pressure at venous end of capillary: An increased pressure at the venule end of the capillary reduces venous return, because the pressure difference between the right atrium and the peripheral veins is reduced. Similarly a decrease in pressure at the venule end would increase venous return. Right atrial pressure: Is the inflow pressure for the heart. It is a function of the amount of blood returned to the heart and the pumping ability of the heart. Its value at rest is normally close to zero but can also become negative (between -4 to 5 mmHg). Its value is increased by blood volume, a weak heart, rapid increase in venous return. Its value is decreased by lower blood volume and a strong heart. The lower the pressure the greater the venous return (due to suction effect), but there is a limit to the increase in venous return because veins are collapsible.
What is the path of blood from the heart to the left big toe?
bicuspid valve-->left ventricle of heart-->aortic valve-->ascending aorta--> aortic arch-->thoracic aorta-->abdominal aorta-->right common iliac artery and /or left common iliac artery (abdominal aorta splits to form right and left common iliac arteries, adjust for which leg you follow) -->right external iliac artery -->right femoral artery -->right popliteal artery-->right anterior tibial artery-->right dorsal pedis artery-->right arcuate artery-->right dorsal metatarsal artery-->right dorsal digital artery-->arteriole-->capillary-->venule-->right dorsal digital vein-->right dorsal metatarsal vein-->right dorsal venous arch-->right great saphenous vein-->right femoral vein-->right external iliac vein-->right common iliac vein-->Inferior vena cava-->right atrium of the heart-->tricuspid valve system is highly interconnected and alternative routes can be followed within the arteries and veins of the lower limbs
What is the difference between arteriole and venule blood flow?
An arteriole transports oxygenated blood from the arteries to the capillary beds and a venule transports de-oxygenated blood from the capillary beds to the veins.
The glomerular capillaries differ from other capillary networks in the body because they?
It is unique from other capillary beds in that it is supplied with and drained by arterioles, the afferent arteriole and efferent arteriole, respectively.
What kind of vessel gives blood to a capillary?
Either a arteriole on the artery side or a venule on the vein side of the bed.
What is the function of postcapillary venule?
The terminal arteriole feeding the capillary bed leads into a metarteriole, which is continous with the thoroughfare channel. The thoroughfare channel, in turn, joins the postcapillary venue that drains the capillary bed.
Why water and dissolved substances leave the arterioles end of the capillary and enter the venule end?
Water and dissolved substances leave the arteriole end of the capillary due to hydrostatic pressure being higher than osmotic pressure and enter the venule of the capillary due to osmotic pressure being higher than hydrostatic pressure.
What is the Medical term meaning tubes that carry the blood?
It's called blood vessel. it can be of following type viz Artery, Vein, Arteriole, Venule, Capillary.
Which one of the following sets of structures correctly lists the sequence of blood flow in the human body?
atrium, ventricle, artery, arteriole, capillary, venule, vein
The flow of blood from an arteriole to a venule is called what?
Microcirculation
What is responsible for gaining ECF from blood at the arteriole end and venule end?
Hydrostatic pressure is the force the gains the ECF from blood at the ends of the arteriole and venule. This process depends heavily on gravity for it to work properly.
What is a tiny vein?
A tiny vein is known as a venule. A tiny artery is an arteriole.
What is the function of a pulmonary arteriole?
a pulmonary artieriole is part of the respiratory system. inside the respiratory system is an organ called alveoli and the alveoli are covered in a network of capillary. the job of the pulmonary arteriole is to carry deoxygenated blood into the capillary network.
What structure shunts blood from the arteriole to the venule?
The structure of an arteriole is:Arterioles are tiny branches of arteries that lead to capillaries.These are also under the control of the sympathetic nervous system, and constrict and dialate, to regulate blood flow.
