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Circulatory, Arterial and Venous System of Frog

Circulatory system of Frog
Biology | Zoology Notes
Circulatory, Arterial and Venous System of Frog
Class 11

Circulatory system of Frog
Circulatory system is the system of blood, heart, and blood vessels.


1. Heart 
  • Heart is triangular muscular pumping organs. 
  • Heart of frog is situated ventrally to the liver in the pericardial cavity. 
  •  Heart is three-chambered. 
  • Upper two chambers are called auricle sand lower one chamber is called ventricle. 
  • Its anterior end is broader then posterior end. 
  • The broader part anterior is known as auricle. 
  • The posterior part is known as ventricle. 
  • The ventricle is thick walled than auricles .right auricle is larger than left auricle.

External structure of heart 
From the ventral view 

  • The tubular structure is present on right side of anterior part of ventricle, which is called truncus arterious gives two branches called aortic trunks. 
From the dorsal view 
  • There is somewhat triangular structure called sinus venosus. It opens into right auricle. The right precaval, left precaval and post caval veins open into sinus venosus. 
Internal structure of heart: 
  • Two auricles are separated by a septum called internal auricular septum. 
  • The right auricle bears opening of sinus venosus called sinu-auricular aperture which is guarded by valves called sinu- auricular valves. 
  • It allows flow of blood from sinus venous to right auricle and prevents back flow of blood. 
  • Left auricle bears opening of pulmonary vein without valve. 
  • Auricles open into ventricles by auriculo-ventricular aperature, which is guarded by four auriculo –ventricular valves. 
  • The flaps of these valves are connected to the wall of ventricles by chordae tendinae. 
  • A ventricle is thick walled and internally give in folding called trabecule. 
  • Ventricle opens into truncus arterious. 
  • The opening is guarded by four semilunar valves, which prevent backward flow of blood from truncus arterious to ventricle. 
  • A truncus arterious is divided into two parts at the base. 
conus arteriosus ( plangium)- which consists spiral valves. 
Bulbous arteriosus ( synangium)- which is again divided into two parts. Cavum aorticum and cavum pulmocutanum.

Each aortic trunk again divides into three vessels: Carotid arch, Systemic arch, Pulmo -cutanous arch 

Arterial system of frog 
Blood vessels, which carry oxygenated blood away from heart to different part of the body, are called arteries. They constitute a system called arterial system. Truncus arterious gives two branches right


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