Home Sweet Home

It feels so nice to be back home even just for few days. Can feel like all the stress and burden are released. But again, sometimes, there are something else stressing me up her, but.....arghhhh...ignore it. I'm home, that's important. The most enjoyable thing being at home is, eating my mummy's cooking, hmmmm, soooooooooo good. Really missed her cooking out there. "what, expecting me to cook by myself, hahaha...you wish" Enjoy being aroung my papa, my brothers and my sis (p/s: she was home also, that is why she is included)....for these past 2 day i'm still at house. Tomorrow i'll be at papa's restaurant. So nice, again, there I can eat what I want. See, whenever i'm at my hometown, the only things I will be doing is eating and eating.. No wonder my weight go up whenever I'm here....hahaha...."do I care".... Being home is one of the best thing ever.... As long I can come back, meet my parent, stay with them, I will, coz there will be one day when, seeing them will be really hard...love my home....:p

Anatomy of Heart...

Since i've start taking MBBS... I have to cover back all the anatomy... quite tiring, but interesting... would like to write about it... at least I can remember also....:

ANATOMY OF HEART

1. The heart is located in mediastinum; about about 2/3 of its mass is to the left of the midline.
2. The heart is shaped like a cone lying on its side; its apex is the pointed, inferior part, whereas, its base is the broad, superior part.
3. The pericardium is the membrane that surrounds and protects the heart; it consist of an outer fibrous layer and an inner serous pericardium, which is composed of parietal and visceral layer of serous pericardium.
4. Between the parietal and visceral layers of the serous pericardium is the pericardial cavity, a potential spaced filled with a few milimeters of pericardial fluid that reduces friction between the two membranes.
5. Three layers make up the wall of the heart; epicardium (visceral layer of the serous pericardium), myocardium and endocardium.
6. The epicardium consist of mesothelium and connective tissue, the myocardium is composed of cardiac muscle tissue, and the endocardium consists of endothelium and connective tissue.
7. The heart chamber includes two superior chambers, right and left atria, and two inferior chambers, right and left ventricles.
8. External features of heart include the auricles (flaps on each atrium that slightly increase their volume), the coronary sulcus between atria and ventricles, and the anterior and posterior sulci between the ventricles on the anterior and posterior surfaces of the heart, respectively.
9. The right atrium receives blood from the superior vena cava, inferior vena cava and coronary sinus. it is separated from the left atrium by the interatrial septum, which contains the fosa ovalis. Blood exits the right atrium through the tricuspid valve (Right atrioventricular valve)
10. The right ventricle receives blood from the right atrium. It is separated from the left ventricle by the interventricular septum and pumps blood through the pulmonary valve into the pulmonary trunk (Right pulmonary arteries and Left pulmonary arteries).
11. Oxygenated blood enters the left atrium from the pulmonary veins and exits through bicuspid (mitral) valve.
12. The left ventricle pumps oxygenated blood through the aortic valve into the aorta.
13. The thickness of the myocardiumof the four chambers varies according to the chamber's function. The left ventricle, with the highest workload, has the thickest wall.
14. The fibrous skeleton of the heart is dense connective tissue that surrounds abd supports the valve of the heart.

*Each auricle increase the capacity of an atrium so that it can hold a greater volume of blood.

* The fibrous skeleton:

• Prevents over streching of the valves as blood pass through.
• Acts as electrical insulator between the atria and ventricles

-Taken from Principles of Anatomy and Physiology, Tortora and Derrickson-

Next will be notes about "Heart valves and circulation of blood"....but not today...:p