Question

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Explain external structure of the human heart.
☞︎︎︎ Functions of external parts.
☞︎︎︎ Draw a labelled diagram of external structure of heart.​

Answer 1

Humans have muscular, chambered heart and it is mesodermally derived Organ.

$\bigstar$ Heart is protected by double walled membrane called pericardium.

1. Outer wall : Parietal pericardium they have to sub layers. Outer layer is made up of fibrous connective tissue and Inner layer is made of simple squamous epithelium.
2. Inner wall : Visceral Pericardium they are also known as Epicardium made up of simple squamous epithelium.

$\bigstar$ Externally, the atrium and the ventricles are separated by the Coronary sulcus.

$\bigstar$ The superior vena cava, inferior vena cava and coronary sinus brings deoxygenated blood from all body parts expect lungs and supply it to right atrium.

• Superior vena cava brings the blood from upper portion of the body.
• Inferior vena cava brings the blood from lower portion.
• Coronary sinus bring the blood from walls of the heart.

$\bigstar$ Pulmonary artery sends deoxygenated blood from right ventricle to lungs.

$\bigstar$ There are 2 pairs of Pulmonary veins which brings oxygenated blood from lungs and supply it to left atrium.

$\bigstar$ Aorta supply oxygenated blood from left ventricle to all parts of the body.