write short notes on.
1] Internal structure of heart
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Answers
Answer:
The human heart is one of the most important organs responsible for sustaining life. It is a muscular organ with four chambers. The size of the heart is the size of about a clenched fist.
The human heart functions throughout a person’s lifespan and is one of the most robust and hardest working muscles in the human body.
Besides humans, most of the other animals also possess a heart that pumps blood throughout their body. Even invertebrates such as grasshoppers possess a heart like pumping organ, though they do not function the same way a human heart does.
Explanation:
Answer:
The human heart is a four-chambered muscular organ, shaped and sized roughly like a man's closed fist with two-thirds of the mass to the left of midline.
The human heart is a four-chambered muscular organ, 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 a pericardial sac that is lined with the parietal layers of a serous membrane. The visceral layer of the serous membrane forms the epicardium.
Layers of the Heart Wall.
Three layers of tissue form the heart wall. The outer layer of the heart wall is the epicardium, the middle layer is the myocardium, and the inner layer is the endocardium.
Chambers of the Heart
The internal cavity of the heart is divided into four chambers:
The internal cavity of the heart is divided into four chambers:Right atrium
The internal cavity of the heart is divided into four chambers:Right atriumRight ventricle
The internal cavity of the heart is divided into four chambers:Right atriumRight ventricleLeft atrium
The internal cavity of the heart is divided into four chambers:Right atriumRight ventricleLeft atriumLeft ventricle
The two atria are thin-walled chambers that receive blood from the veins. The two ventricles are thick-walled chambers that forcefully pump blood out of the heart. Differences in thickness of the heart chamber walls are due to variations in the amount of myocardium present, which reflects the amount of force each chamber is required to generate.
The two atria are thin-walled chambers that receive blood from the veins. The two ventricles are thick-walled chambers that forcefully pump blood out of the heart. Differences in thickness of the heart chamber walls are due to variations in the amount of myocardium present, which reflects the amount of force each chamber is required to generate.The right atrium receives deoxygenated blood from systemic veins; the left atrium receives oxygenated blood from the pulmonary veins.