How many capillary beds does a red blood cell in the hepatic portal vein pass through before reaching the heart?

The part of the circulatory system that transports blood through the lungs, where it is oxygenated, is  called pulmonary circulation. Pulmonary circulation is the movement of blood from the heart, to the  lungs, and back to the heart again. The veins return waste-laden blood to the heart, entering the right  atrium through two large veins called vena cavae. The right atrium fills with the waste-laden blood and  then contracts, pushing the blood through a one-way valve into the right ventricle. The right ventricle

fills and then contracts, pushing the blood into the pulmonary artery, which leads to the lungs. The  pulmonary artery divides into two branches after leaving the heart, with each branch going to a lung. The exchange of carbon dioxide and oxygen takes place in the lungs. The pulmonary artery branches  subdivide into arterioles that finally subdivide into many capillary beds in the lungs. These capillary beds  are closely associated with alveoli (the smallest air passages of the lungs).  A minimum amount of tissue separates the blood in the capillary beds from the alveoli. This allows carbon  dioxide (the gaseous waste of animal metabolism) to be exchanged for oxygen from the air. Oxygenated  arterial blood is bright red in color, and unoxygenated venous blood is dark or brownish red.  The fresh, oxygen-rich blood enters the pulmonary veins and then returns to the heart, re-entering through the left atrium. The oxygen-rich blood then passes through  a one-way valve into the left ventricle  where it will exit the heart through the aorta. The left ventricle’s contraction forces the blood into  the aorta and the blood begins its journey throughout the body.  The pressure required for pulmonary circulation is much less than that required for systemic, or body  circulation. Therefore, the muscle mass developed in the right ventricle is much less than that of the  left ventricle.  The heart and the vessels that move oxygenated arterial blood to all parts of the body and return the  unoxygenated venous blood to the heart are referred to as the systemic circulatory system. The blood  vessels (arteries, veins, and capillaries) are responsible for the delivery of oxygen and nutrients to the

tissue. Oxygen-rich blood enters the blood vessels through the heart’s main artery called the aorta. The  forceful contraction of the heart’s left ventricle forces the blood into the aorta, which then branches into

many smaller arteries that run throughout the body. The inside layer of an artery is very smooth,  allowing the blood to flow quickly. The outside layer of an artery is very strong, allowing the blood to  flow forcefully. The oxygen-rich blood enters the capillaries where the oxygen and nutrients are released.  The waste products are collected, and the waste-laden blood flows into the veins to return to the  heart where pulmonary circulation will allow the exchange of gases in the lungs.  During systemic circulation, blood passes through the kidneys. This phase of systemic circulation is  known as renal circulation. During this phase, the kidneys filter much of the waste from the blood. Blood  also passes through the small intestine during systemic circulation. This phase is known as portal circulation.  During this phase, the blood from the small intestine collects in the hepatic portal vein, which  passes through the liver. The liver filters sugars from the blood and stores them for later use.

Explanation:

answerthe capacity to preform work;