'Heart of heart' is:
Show Hint
This part is responsible for generating contraction in the heart muscles.
- SA node
- AV node
Bundle of His
- Purkinje fibres
The Correct Option is A
Solution and Explanation
SA node is called the ‘heart of heart’. The contraction in the heart is initiated by a structure made up of modified heart muscles called Sino-Atrial Node (SA Node). The SA node is located in right atrial wall below the opening of the superior vena cava. It initiates the contraction in the heart which is then spread to the entire heart through the network of fibres. Since it is responsible for initiating contraction, it is also called as ‘pace maker’ or ‘heart of heart’.
The other node AV node is called the pace setter. AV node passes the contraction generated by the SA node to the bundle of his which is further passed through the fibrous network to the remaining parts of the heart. Purkinje fibres carry the impulse through bundle of his to the ventricular muscles.
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Concepts Used:
Body Fluids and Circulation
Liquid substances in the animal or human body are known as body fluids. The human body consists of about 60-67% body fluids. The chief components of the human body fluids are blood and lymph. Blood comprises a matrix called plasma with blood corpuscles floating in it. The blood cells are white blood cells, red blood cells, and platelets. Lymph consists of lymph cells.
Read More: Body Fluids and Circulation
Types of Body Fluids:
The different types of body fluids:
Blood
The main components of blood involve;
- Plasma
- Red Blood Cells
- White Blood Cells
- Platelets
Lymph
A colorless fluid present in the interstitial tissues is lymph. It circulates all over the lymphatic system. It can be described as blood without the RBCs. The exchange of hormones, nutrients, and gases occurs via this fluid. It contains lymphocytes that play a major function in the immune responses of the body.
The movement of blood across the vessels of the body that carries nutrients and gases along with it and removes waste from the different parts of the body is circulation.
Types of Circulatory Systems:
There are two types of circulatory systems:
- Open Circulatory system
- Closed circulatory system