WHY ARE THE WALLS OF ARTERIES PROPERTIONATELY THICKER THAN THOSE OF THE CORRESPONDING VEINS?
Because the blood is pumped directly into arteries so there is more pressure on the arteries
AN ARTERIAL TRUNK THAT HAS THREE MAJOR BRANCHES, WHICH RUN TO THE LIVER, SPLEEN, AND STOMACH
TRACE THE PATHWAY OF A CARBON DIOXIDE GAS MOLECULE IN THE BLOOD FROM THE INFERIOR VENA CAVA UNTIL IT LEAVES THE BLOODSTREAM. NAME ALL STRUCTURES (VESSELS, HEART CHAMBERS, AND OTHERS) PASSED THROUGH EN ROUTE.
RIGHT ATRIUM -> RIGHT VENTRICLE -> PULMONARY TRUNK -> RIGHT OR LEFT PULMONARY ARTERY -> LOBAR ARTERY -> PULMONARY CAPILLARY BEDS IN LUNGS -> AIR SACS OF LUNGS.
Trace pathway of oxygen gas molecule from an alveolus of the lung to the right atrium of the heart
alveolar capillary walls; pulmonary vein; left atrium; left ventricle; aorta; systemic arteries; capillary beds of tissues; systemic veins; superior or inferior vena cava
Branches of the internal carotid and vertebral ateries cooperate to form a ring of blood vessels encircling the pituitary gland, at the base of the brain. What name is given to this communication network?
CIRCLE OF WILLIS
WHAT IS THE FUNCTION OF THE CEREBRAL ARTERIAL CIRCLE (CIRCLE OF WILLIS)?
PROVIDES ALTERNATE PATHWAYS FOR BLOOD TO REACH BRAIN TISSUE IN THE CASE OF IMPAIRED BLOOD FLOW IN THIS SYSTEM
TRACE THE PATHWAY OF A DROP OF BLOOD FROM THE AORTA TO THE LEFT OCCIPITAL LOBE OF THE BRAIN, NOTING ALL STRUCTURES THROUGH WHICH IT FLOWS?
aorta---->subclavian artery-----> vertebral artery-------> basilar artery-----> posterior cerebral artery----->left occipital lobe
What is the exception to the fact that most arteries carry oxygen rich blood?
the pulmonary arteries
Most arteries of the adult body carry oxyen-richblood, and the veins carry oxygen-depleted, carbon dioxide-richblood. What is different about the pulmonary arteries and veins?
The pulmonary arteries carry oxygen-poor blood to the lungs, the pulmonary veins carry oxygen-rich blood from the lungs to the heart
Why is the hepatic portal blood carried to the liver b4 it enters the systemic circulation?
BC it is rich in nutrients and the liver is responsible for maintaining proper blood concentrations of glucose, proteins, etc. and its phagocytes rid the body of debris
What is the special vessel called where the unpaired veins draining the digestive tract organs empty and carry blood to the liver b4 it enters the systemic venous system?
blood drained from the digestive viscera
The failure of two of the fetal bypass structure to become obliterated after birth can cause congenital heart disease in which the youngster would have improperly oxygenated blood which are the two?
Ductos Arteriosus and Foramen ovale
Which carries oxygen-poor blood from the fetus to the placenta?
Shunts blood through the fetal liver bypassing the bulk of its tissue?
Bypass the lungs by shunting blood from the right atrium to the left atrium?
Carries oxygen-rich blood from the placenta to fetus?