The chief collecting vessels of the thoral d the hemiazygos vein. These veins re
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The chief collecting vessels of the thoral d the hemiazygos vein. These veins receive blood which in turn receive blood from the chest eins, which drain blood from the inferior portion chial veins draining the passageways of the lungs; s. other Brachiocephalic e Azygos and Name Anatomy of Blood Vessels REVIEW SHEET Lab Section . Date 1. Describe the main structural difference between elastic and muscular arteries. What is the functional significance of this difference? 2. Describe and compare the two main circulatory pathways: the pulmonary circulation and the systemic circulation.Explanation / Answer
1. ELASTIC ARTERIES
These arteries are close to the heart such as AORTS and it's branches.
These are HIGH PRESSURE arteries as the heart directly ejects blood into them.
They contain ELASTIN in abundance which allows them to expand.
They have THICK TUNICA MEDIA made up of ELASTIN.
2. MUSCULAR ARTERIES
TUNICA MEDIA is mainly composed of smooth muscle.
They deliver blood to different organs.
They have more smooth muscle compared to ELASTIN which enables them to CONSTRICT or DILATE.
They mainly regulate circulatory dynamics such as blood pressure.
3. PULMONARY CIRCULATION
It is that type of circulation in which deoxygenated blood is pumped from heart to lungs ( through Pulmonary arteries) and oxygenated blood is returned to heart by Pulmonary veins.
It is a low pressure and low resistance system.
SYSTEMIC CIRCULATION
In systemic oxygenated blood is pumped by heart through aorta to different organs and deoxygenated blood is received by heart through superior and inferior venecave.
It is a high pressure and high resistance system
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