ANAT1053 Lecture Notes - Anterior Interventricular Branch Of Left Coronary Artery, Internal Iliac Artery, Umbilical Artery

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peterliban

12 Jun 2022

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Cardiac circulation and lca: oxygenated blood is supplied to the myocardium is provided by the r & l coronary arteries (rca, the heart receives most of the blood when the heart relaxes. The heart takes care of pumping oxygen around the body but the heart itself also needs oxygen: oxygenated blood supplied to myocardium provided by r & l coronary arteries (rca and. Lca): heart receives most of the blood when the heart relaxes. Generally right supplies right side / left supplies left side. All nutrient, excretory, & gas exchanges occur through placenta, connected to fetus by umbilical cord: umbilical cord, one umbilical vein (enters liver & inferior vena cava), two umbilical arteries (each a branch of internal iliac artery). Fetal heart starts pumping blood on day 22/23 22 of gestation, but lungs non-functional until birth. In different areas of the heart, the autorhythymic cells have different rhythms. (spontaneous contractions) of the heart.

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Background:

It is a peculiarity of the cardiac circulation that there are channels thatpass from coronary arterioles, from the capillary bed,and from the cardiac veins directly into the lumen ofthe heart. Irregular thin-walled channelsof larger than capillary size, which are called"myocardial sinusoids," also receive blood from the coronary arterioles or the capillary bed andcommunicate with the smallest cardiac veins that opendirectly into the chambers of the heart, particularly into the atria. It has been assumed that the stream in these veins can be reversedand thus help in nourishing the ischemic myocardium incase of coronary obstruction. Some of theseopenings in the cardiac cavity can be seen with nakedeye by inspection of the endocardial lining. They vary from pinpoint size to almost 1 mm in diameter.

Does the coronaryarterial system enter into communications with other arteries inthe neighborhood and if so, how do these arteries reach theheart?

How important are theyfor the supply of the ischemicmyocardium?

raspberrycicada170

1)How is oxygenated and deoxygenated blood distributed through fourchambers?

2) What is the structure that blood returns to the heartthrough and what chamber of the heart does it lead to?

3) Which chamber pumps oxygenated blood to the entire body,what structure does the blood pass through?

4) What is myocardium and which chamber has the thickest layerof myocardium, why?

5) Where is blood coming from when it enters the leftatrium?

6)What is the purpose of the bicuspid and tricuspidvalves?

7)What is the purpose of the sinoartrial node?

8)What are the papillary muscles?

9) What are purkinje fibers?

10) What would happen if there was a hole in the interatrialseptum or inerventricular septum?

goldtortoise184

A portion of cardiovascular system that transports oxygen depleted blood from the heart to lungs and brings oxygenated blood back to heart is
(a) Pulmonary circulation
(b) Coronary circulation
(c) Systemic circulation
(d) Single circulation system

ANAT1053 Lecture Notes - Anterior Interventricular Branch Of Left Coronary Artery, Internal Iliac Artery, Umbilical Artery

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