[Biology Class Notes] on Difference Between Left and Right Ventricle Pdf

Human heart is the major organ involved in the double circulatory system and it is called double because here, the blood passes through the heart twice per circuit. The left pump sends the fresh oxygenated blood around the body and on the other hand, the right pump sends deoxygenated blood to the lungs where it becomes oxygenated and flows back to the heart. 

Thus, oxygenated and deoxygenated blood in human beings are separately flowing and makes the circulatory system more efficient which also helps in maintaining the constant temperature of the body. Below are the four heart chambers that have important roles in the double circulation in human beings; we can observe from the following the difference between the functions of the left and right ventricles.

• Left Atrium: Receives oxygenated blood from lungs which contain oxygen.

• Right Atrium: It receives deoxygenated blood that contains CO₂ as the byproduct of metabolism.

• Left Ventricle: It also receives oxygenated blood coming from the left atrium via a bi-cuspid valve.

• Right Ventricle: It receives deoxygenated blood consisting of CO₂ from the right atrium via the tricuspid valve.

• Human Heart consists of four chambers consisting of an auricle and ventricle. Ventricles are of two types, namely, left and right ventricle occupying two chambers; auricles or atrium is also of two types, namely, left atrium and right atrium.

• A ventricle is part of our heart and it is one of the two large chambers located towards the bottom of the heart. Its function is to collect and expel blood that is received from an atrium towards the peripheral beds within the lungs and body. 

• To know about the atrium or auricle, it is an adjacent upper heart chamber that primes the pumping and it is smaller and has thinner muscular walls than a ventricle.

• All these four chambers are parts of the circulatory system of our body which is helpful in supplying nutrients and oxygen to the body tissues and organs. It will also be helpful in removing body wastes and carbon dioxide from the body.

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Structure of the Ventricles 

• Ventricles have thicker walls than the atria and are known to generate higher blood pressures. The physiological load on the ventricles is much greater to pump the blood throughout the body and lungs as compared to the pressure generated by the atria to fill the ventricles.

• Further, the left ventricle is known to have thicker walls than the right ventricle and it is helpful in pumping blood to almost all parts of the body whereas the right ventricles fill only the lungs.

• Ventricles have irregular muscular columns called trabeculae carnage on the inner walls and these cover all of the inner ventricular surfaces except the right ventricle’s conus arteriosus. 

• According to magnetic resonance imaging, the mass of the left ventricle is estimated to be 143 g where 38.4 g is variable.

• The right and left ventricles are equal in size and comprise roughly 85 milliliters in the adult. Its upper surface can be found circular and convex and the under surface is flattened.

• Ventricular bulges into the right ventricle where a transverse section of the cavity presents a semilunar outline. 

• There is a tendinous band known as the tendon of the conus arteriosus that extends upward from the right atrioventricular fibrous ring. The ring mentioned here connects the posterior surface of the band to the aorta.

 

Shape of the Left and Right Ventricles

1. The left ventricle is lengthier and more conical in shape than the right ventricle, and on the transverse section, its concavity presents an oval or nearly circular outline. It is a considerable part of the heart’s diaphragmatic surface and it forms a small part of the sternocostal surface; it also forms the apex of the heart. 

2. The left ventricle is thicker and muscular as compared to the right ventricle because it pumps blood at a higher pressure.

3. The right ventricle is triangular in shape and it extends from the tricuspid valve in the right atrium to near the apex of the heart. Its wall is found thickest at the apex and thin towards its base at the atrium.

Conclusion

The left and right ventricle is a very important chapter in Biology. Students should keep in mind to cover this topic without any doubts because questions might be given regarding this chapter in exams. So, it is recommended to have a clear idea of this chapter. In order to ace this chapter, we at have some tips to which the student can keep in their mind. These points might help the students to have the chapter cleared easily.