lecture 2 different blood vessels

the pulmonary circulation begin from the right ventricle which pushes oxygen poor blood into the pulmonary trunk

after oxygenation in the lungs the blood returns to the heart via pulmonary vein it reaches the left atrium and gets pushed down into the left ventricle

the systemic regulation begins from the left ventricle

in the systemic regulation, blood is ejected into the aorta

via arteries the blood reaches the organs and tissues where gas exchange take place

after gas exchange the blood returns to the heart and via vena cava it enters right atrium and then right ventricle

the first part of the circulatory system is the heart which pumps blood from low pressure regions (veins) to high pressure regions (arteries)

compression chambers are elastic type artiers

elastic arteries consist of elastic membranes which expand during ejection

during diastole the elasticity of the walls, allows for regain of its initial diameter

2 examples of elastic type arteries are aorta and pulmonary trunk

aorta and pulmonary trunk are elastic type arteries, arteries further from the heart are muscle type arteries which can generate resistance because of smooth muscle cells

atherosclerosis leads to high pressure during systole

athersoclerosis leads to very low pressure during diastole

resistance vessels are muscle type arteries

arteries and arterioles are resistance vessels which consist of smooth muscle cells

precapillary sphincters are the last smooth muscle cells before capillareies

in case if a tissue is in working state, the precapillary sphcinters are open

in case of non-working tissues, the precapillary sphincters are closed

exchange vessels are capillaries

depot vessels are veins and venules

veins have a very compliant wall which makes them good at "store" blood

arteriovenous anastomosis is an example of shunt blood vessel

functions of arteriovenous anastomosis is that it increase venous return because it provides a faster route for the blood

arteriovenous anastomisis let larger blood vessels such as leukocytes pass through to the veins

resorptive blood vessels are lymph vessels

lymph vessels carries interstitial fluid bakc to the veins

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