”1. Describe the pathway of blood traveling through the closed system of the circulatory system starting...

”1. Describe the pathway of blood traveling through the closed system of the circulatory system starting with the right atrium.”

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Alternatively, you may also draw a map of blood traveling through the closed circulatory system and insert it below

”2. What are the main resistance vessels of the circulatory system? How are they controlled? ”

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Expert Solution

1. Pathway of blood travelling through closed system :-

Right atrium recives blood from the two large veins of the body i.e. Superior vena cava (SVC) and Inferior vena cava (IVC), then this blood follow the following path and supply blood to the various body tissues. The blood is then collected back via venuels and veins which futher drain into SVC and IVC, and blood finally return back to Right Atrium.

IVC and SVC ----> Right Atrium ---->Tricuspid Valve ----> Right Ventricle -----> Pulmonary valve ----> Pulmonary artery -----> Pulmonary capillary ----->Pulmonary vein ----- > Left atrium ----> Mitral Valve-----> Left ventricle ------> Aortic semilunar valves ---> Aorta ---->Large Arteries --->Small arteries ----> arterioles ----> inside the tissue divides into many small capillaries (gas and nutrients exchange occur) -----> venules ----> veins -----> Superior and Inferior vena cava ----> Right Atrium.

2. Small arteries and Arterioles are the major Resistant vessels of the circulatory system. As they have small diameter and thick vessel wall due to presence of thick smooth muscle layer. The resistance in these vessels is controlled by vasoconstriction and vasodilation mediated by sympthetic or parasympathetic nervous system. Also local vasoactive Peptides like VIP, endothelin, angiotensin, substance P etc.

Sydney Mullin answered 1 year ago

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