Science, asked by aniketh62009, 2 months ago

please help me please help me​

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Answered by sadyashHere64
3

Answer:

Heart is present almost at centre in

thoracic cage. It is present behind the

ribs, between two lungs and slightly

inclined on left side.

Size of our heart is equal to one's

own fist and its weight is about 360

gram. It is covered by a double layered

peritoneal membrane. A fluid is present

between two membranes due to which

heart is protected from friction and

mechanical shocks.

Human heart is a muscular organ.

It is made up of involuntary cardiac

muscles. They contract and relax with a

definite rhythm. This is called as beating

of heart.

Internally, heart is divided into left

and right compartments by a vertical

partition. Each of those compartments

is again divided into two chambers.

Thus, in all, heart consists of four

chambers. Upper chambers are called

as atria (singular - atrium) and lower

chambers as ventricles

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