external structure of heart
Answers
Answer:
The heart has four chambers, two upper atria, the receiving chambers, and two lower ventricles, the discharging chambers. ... There is an ear-shaped structure in the upper right atrium called the right atrial appendage, or auricle, and another in the upper left atrium, the left atrial appendage.
Answer:
(1) Human heart consists of two superior, small thin walled receiving chambers called atria or auricles and two inferior, large, thick walled, distributing chambers called ventricles.
(2) Atrio-ventricular groove or coronary sulcus, a transverse groove which is present between the atria and the ventricles is seen externally.
(3) The interventricular sulcus is present between the right and left ventricles. Coronary arteries and coronary veins are present in the sulci. The coronary veins join to form coronary sinus which opens into the right atrium.
(4) The right atrium receives deoxygenated blood from all over the body through superior vena cava and inferior vena cava.
(5) Left atrium receives oxygenated blood from lungs through two pairs of pulmonary veins.