Question

Systematic heart refers to
A. The two ventricles together in humans
B. The heart that contracts under stimulation from nervous system
C. Left auricle and left ventricle in higher vertebrates
D. Entire heart in lower vertebrates

Answer 1

Hint: Systematic heart refers to systematic circulation of blood in the body of higher vertebrates. In this system the oxygenated blood is carried to the different parts of the body and deoxygenated blood is brought from the tissues and organs to release carbon dioxide present in it out of the body.

Complete answer:
Blood is pumped with the help of heart from the left ventricle and through the aorta and arteries that merge into arterioles before reaching tissues and organs for exchange of gases with the capillaries. This process takes place with the help of the blood passing throughout the body and providing oxygen to various tissues of the body and brings back the released air from the tissues to exhale it out of the body.

The left auricle and ventricle is referred as systematic circuit which takes blood to the entire body from the heart and brings back the deoxygenated blood from entire body to the heart again. The pulmonary circuit is referred to the right auricle and right ventricle and propels the blood to the lungs for gas exchanges with the atmosphere.

Hence, The correct answer is option (C).

Note: Right auricle and right ventricle are pulmonary circuits that propels blood to the lungs for exchange of gases and left auricle and left ventricle which transport the blood to the entire body including cells, tissues and organs. This system is vital for exchange of gases and facilitates the process of respiration in our body.