It is pinkish in colour and conical in shape. The heart of man is four chambered 2 auricles and 2 ventricles. (3) It prevents the heart from the bad effect of friction at the time of contraction. It prevents the two membranes from collapsing. (1) It prevents the heart from external jerks. Pericardial cavity is a true coelom (as it lies between two layers of mesoderm). The narrow space in between these two membranes is called pericardial cavity.Ī serous fluid is present in this cavity it is called pericardial fluid. (ii) Inner : Visceral pericardium or epicardium made up of simple squamous epithelium (Serous membrane). (b) Inner : Simple squamous epithelium (Serous membrane) (a) Outer : Fibrous connective tissue layer (i) Outer : Parietal pericardium in which two sub layers are present : Covering of heart is called pericardium which consists of two layers : Its lower narrow portion is tilted towards left side. Its triangular superior-broad portion is tilted slightly towards right (dorsal) side. Left lung has cardiac notch, heart is 5×3.5 inches in size, weight 300 gm. Heart is situated at the ventral side of mediastinal space of thoracic cavity in between the lungs. Even invertebrates such as grasshoppers possess a heart like pumping organ, though they do not function the same way a human heart does. Besides humans, most of the other animals also possess a heart that pumps blood throughout their body.The human heart functions throughout a person’s lifespan and is one of the most robust and hardest working muscles in the human body.The size of the heart is the size of about a clenched fist. It is a muscular organ with four chambers. The human heart is one of the most important organs responsible for sustaining life.
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