Question

External and internal structure of Heart ​

Answer 1

Answer:

Internal Structure of the Heart. ... Located in each of these openings between the atria and ventricles is a valve, a specialized structure that ensures one-way flow of blood. The valves between the atria and ventricles are known generically as the tricuspid (right side)and the bicuspid (left side) valve.

Answer 2

hello dear!

External structure:

• The smaller upper chambers, auricles (atria) are demarcated externally from the lower larger chambers ventricles by an irregular groove called the coronary sulcus.
• The two ventricles are demarcated externally from each other by an oblique groove termed as inter-ventricular sulcus. This groove contains coronary blood vessels that supply blood to the heart muscles.

Internal structure:

The heart is a hollow organ that contains four chambers, various apertures, valves and great blood vessels.

a) Chambers of the heart:

• The upper smaller chambers of the heart are auricles or atria.
• They are the collecting chambers for the blood returning to the heart.
• They have thin walls, because they have to force blood into the ventricles that lie just below them.
• The two auricles are separated from each other by a partition, the inter-auricular septum or inter-atrial septum.
• The lower larger chambers of the heart are ventricles.
• They are the distributing chambers of the blood reaching from the auricles.
• The two ventricles are separated from each other by a partition, the inter-ventricular septum.
• The ventricles have thicker walls than that of the auricles
• The wall of the left ventricle is about three times as thick as that of the right ventricle, which is because the left ventricle has to pump the blood to the farthest end of the body whereas the right ventricle has to pump blood to the lungs, which lie nearby.

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