SELECT * FROM question_mgmt as q WHERE id=6057 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=11 AND subId=16 AND chapterId=471 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 7th science Transportation in Animals and Plants describe the function of the heart

Question:

Describe the function of the heart.

Answer:

HEART: The heart is an organ which pumps blood to all the parts of our body through a network of tubes called blood vessels. Heart beats continuously to circulate blood in the body. The heart works like a pump non-stop throughout our life. It is located in the chest cavity slightly towards the left side. The heart lies between the two lungs and above the diaphragm and its size is roughly equal to our fist. The heart is made up of special muscle called ‘cardiac muscle’ but it is not solid muscle. The heart is hollow inside. The heart has four compartments called ‘chambers’. The upper two chambers of heart are called atria (singular of atria is atrium) and the lower two chambers of heart are called ventricles. On the left side of the heart are left atrium and left atrium and left ventricle. On the right side of the heart are right atrium and right ventricle. Right atrium receives carbon dioxide rich blood from the body. Blood from right atrium enters the right ventricle, which contracts and pumps the blood to the lungs. On the other hand, oxygen rich blood from the lungs returns to the left atrium. From the left atrium, blood enters left ventricles. Left ventricles contracts and pumps the blood to all parts of the body.

Human heart diagram:

    human heart 

Functions of heart: The main functions of heart-
1. Pumping oxygenated blood to the other body parts.
2. Pumping hormones and other vital substances to different parts of the body.
3. Receiving deoxygenated blood and carrying metabolic waste products from the body and pumping it to the lungs for oxygenation.
4. Maintaining blood pressure.


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