Internal structure of the heart
Answers
Answer:
the human heart has 4 chambers muscular organ,shaped size roughly like a man closes first with two-third of the mass of to the left middle
Answer:
(1) There are four chambers in the heart, viz., two atria and two ventricles which can be demarcated internally.
(2) Atria are thin walled upper receiving chambers separated from each other by interatrial septum.
(3) The right atrium receives deoxygenated blood from all over the body through superior vena cava, inferior vena cava and from the heart through coronary sinus.
(4) The opening of inferior vena cava is guarded by Eustachian valve while the opening of coronary sinus is guarded by Thebesian valve.
(5) The fossa ovalis is oval depression that is present on the right side of interatrial septum. It is the remnant of foramen ovale, an oval opening in the interatrial septum of the foetus.
(6) The left atrium receives oxygenated blood from the lungs through four openings of pulmonary veins.
(7) Right and left atria open into the right and left ventricles respectively through atrioventricular apertures. These are respectively guarded by tricuspid and bicuspid valves made up of connective tissue.