Question

Explain the heart structure in detail

Answer 1

the human heart is a four chambered muscular organ which is shaped and sized roughly like a man's closed fist with two thirds of the mass to the left of midline.
the heart is enclosed in pericardinal sac that is lined with the parietal layers of a serous membraane forms the epicardium.
Three layers of tissues form the heart wall. 
1. The outer layer (epicardium)
2. The middle layer (myocardium)
3. The inner layer (endocardium)

the internal carvity of the heart is divided into four chambers which includes:
1.Right atrium
2.Right ventricle
3. left atrium, and
4.left ventricle

Answer 2

$\huge \sf \underline{Structure - }$

→ Heart is a hollow, muscular organ present in between two lungs in the thoraric cavity. It's size is about one's fist. It is 12 cm long and 6 cm wide.

→ It's weight in male is 300 gm and 250 gm in female. It's is reddish brown in colour.

→ It's upper broad part is known as base and lower part is known as Apex.

→ It's is protected by a double members called pericardium, comprising inner visceral pericardium and outer parietal pericardium.

→ Between these layers there is a fluid called pericardium fluid. This fluid provides moisture to the heart and reduce the friction between heart wall and surrounding tissue.

→ A human heart is four chambered. Two upper; smaller chambers called atria and the lower; longer chambers called ventricle.

→ The atrium and ventricle of the same side are separated by atrio-ventricular septum.

→ Atrial septum separates the left and right atria. Inter ventricular septum separates the left and right ventricles.

→ The opening between right atrium and ventricle is guarded by a valve called Tricupsid valve.

→ And the opening between left atrium and ventricle is guarded by a Bicuspid valve.

→ Valves prevent the backward flow of blood and allow the blood to flow in one direction only.

$\huge \sf \underline{Functions - }$

→ It's main function is pumping the blood.

→ It contains two types of blood i.e. Oxygenated and Deoxygenated.

* Oxygenated is send to all parts of the body.

* Deoxygenated is send to lungs to purify it.

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