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JustinJakubisinVessels (Blood Vessel Types (Types of arteries and veins…
JustinJakubisinVessels
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Blood Vessel Types
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Structure of arteries and veins, arterioles and venules.
Arteries, arterioles, venules, and veins are composed of three tunics known as the tunica intima, tunica media, and tunica externa. Capillaries have only a tunica intima layer.
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Describe the role of arterioles in regulating tissue blood flow and systemic arterial blood pressure
Arterioles regulate the arterial blood pressure and blood flow into an organ
-arterioles: conduct blood from arteries to capillaries; walls of larger arterioles
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Fetal pathway
By passes the lungs-superior vena cava --> right atrium --> right ventricle --> pulmonary trunk --> ductus arteriosus --> descending aorta
Most of the blood flows across to the left atrium through a shunt called the foramen ovale. From the left atrium, blood moves down into the lower chamber of the heart (the left ventricle). It is then pumped into the first part of the large artery coming from the heart (the ascending aorta).lungs are not functional in the fetus, and the blood passes directly from the right atrium to the left atrium or from the right ventricle to the aorta
Hepatic pathway
Hepatic portal vein ->Sinusoids (capillary networks) of the liver) ->Hepatic vein ->Inferior vena cava ->Right atrium
Carries venous blood from the digestive organs to the liver via portal vein; nutrient rich DOB absorbed from the GI tract is processed in the liver before entering the heart;
Systemic pathway
left ventricle->aorta->arteries to body->capillaries->anterior vena cava/ posterior vena cava->right atrium->pulmonary circuit
Systemic circulation refers to the circulation of blood in which oxygenated blood is pumped from the heart to the body and deoxygenated blood is returned back to the heart. Systemic circulation occurs between the heart and the entire body.
Pulmonary pathway
right atrium->right ventricle-> pulmonary trunk-> pulmonary artery,->capillaries of the lungs->pulmonary vein left atrium
Pulmonary circulation refers to the circulation of blood in which deoxygenated blood is pumped from the heart to the lungs and oxygenated blood is returned to back to the heart. Pulmonary circulation only occurs between the heart and the lungs.
Placental pathway
Placental circulation allows the umbilical arteries to carry deoxygenated and nutrient-depleted fetal blood from the fetus to the villous core fetal vessels.
Blood flow in the unborn baby follows this pathway: Oxygen and nutrients from the mother's blood are transferred across the placenta to the fetus through the umbilical cord. But most of this highly oxygenated blood flows to a large vessel called the inferior vena cava and then into the right atrium of the heart.