answering an anatomy and physiology questions

BIOLOGY
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CARDIOVASCULAR SYSTEM
1. Human heart is fist sized and weighs 250to 350 grams. It is positioned in the chest between the lungs at the back of the sternum and above the diaphragm. Human heart is comprised of four sections: the right and left ventricles and atria. The heart wall comprises of three following layers: the epicardium, the myocardium and the endocardium. (Schweich, Cyril and Todd, 2017).
2. The pericardial fluid lessens resistance in the pericardium through lubricating the epicardial surface letting the membranes gliding over each other with every beating of heart. Harms may occur in case the pericardium becomes enflamed or fluid fills in it. This may injure the heart and influence the function.
3.
    Epicardium
    Myocardium
    Endocardium
    Outer defending heart layer.
    Middle muscular heart wall layer.
    Inner heart layer.
    Helps in pericardial fluid making.
    Helps generating the power required for pumping oxygenated blood from the heart to the entire body. (Oosterhoff et al. 2016).
    Protects the valves as well as chambers of the human heart.
4. The interventricular septum is the component of the heart structure and divides the right ventricle from the left one. Interventricular septum’s upper component termed as septum’s membranous part. Atria are passive as they get blood through the veins. The ventricles are active as they push blood into arteries from the heart.
5. Heart valve functions: a) Opening properly for blood to be emptied from the chamber, and b) closing aptly for blood cannot stream the incorrect way. AV valves - within atrium and ventricles, linked with the chordae tendineae, and papillary muscle. Closes in each heart’s pumping. SL valves positioned in between the pulmonary trunk or the aorta- closees once ventricles gets relaxed. (Schweich, Cyril and Todd, 2017).
6. Tendon-like, stringy cords which link the AV cusps of valves to the inner exterior of the papillary muscle. Muscular columns which are positioned on the inner exterior of the ventricles.
7. Superior vena cava carries deoxygenated blood from our...