Question

With the neat labelled digram describe the internal structure of heart

Answer 1

Answer:

the human heart is a hollow muscular bag like organ made up of powerful muscles .The human heart is shaped like upside down pear. The heart is approximately the size of closed Fist of an individual. It is located in the chest region below the lungs the tapered end of heart is known as apex is point for forward and towards the left .The heart is divided into left and right parts by thick vertical muscular wall known as septum. The left and right parts are divided into four Chambers namely

1. the right Atrium (also known as the right auricle),
2. the right ventricle ,
3. the left atrium (also known as left auricle)
4. the left ventricle

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Answer 2

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The chromosome is the condensed and compactly arranged structure of the DNA with the help of histone proteins H1, H2A, H2B, H3 and H4. This is the structure which can be visible during the metaphase of cell division. This condensed packing allows the long DNA in the eukaryotes to be packed in the nucleus of the cell.

There are two arms known as the p-arm and the q-arm. There is a constriction which is known as the centromere where the kinetochore is formed for the attachment of the spindle fibres during the cell division. The position of the centromere decides the type of the chromosome as metacentric, submetacentric, acrocentric and telocentric. There is telomere at the end of te arm which are highly condensed regions like the centromere. There are high condensed heterochromatin and less condensed euchromatin regions.