Question

The correct pathway of blood circulation in the human body is
A. Heart→ pulmonary vein → capillary→ pulmonary artery → heart
B. Heart → pulmonary artery→ lung → pulmonary vein → body systems → Heart
C. Heart → pulmonary artery → lungs→ pulmonary vein→ heart→ body system
D. body systems → lungs→ heart → vein → capillary → artery
E. Heart → pulmonary artery→ lungs→ body systems→ vein → heart

Answer 1

The double circulation is present in birds and mammals in which blood passes through the heart two times before being delivered to the heart.
The pulmonary artery is the only artery that carries deoxygenated blood while the pulmonary vein is the only vein that carries oxygenated blood.

Complete answer:
The blood circulatory system is a network consisting of blood, blood vessels, and the heart. This network supplies tissues in the body with the oxygen and other nutrients, transport hormones, and removes waste products.
The human heart is made up of specialized cardiac muscle tissue that allows it to act as a pump in the circulatory system. The human heart is divided into four chambers, one atrium and one ventricle on each side of the heart where atria receive blood and ventricles pump blood.
The heart pumped the blood throughout the body using blood vessels, where arteries carry blood away from the heart and into capillaries providing oxygen and other nutrients to tissue and cells. When oxygen is removed the blood travels back to the lungs where it is deoxygenated and returned by veins to the heart.
The human circulatory system is a double circulatory system involves two circuits-
- Pulmonary or lesser circulation- It involves the flow of deoxygenated blood from the right ventricle to the lungs and the return of oxygenated blood from the lungs to the left atrium is known as pulmonary circulation.
- Systemic or greater circulation- It involves the flow of oxygenated blood from the left ventricle to all parts of the body and deoxygenated blood from various body parts to the right atrium.

The correct pathway of blood circulation in the human body is the option C.
Heart → pulmonary artery → lungs→ pulmonary vein→ heart→ body system

Note: The blood capillaries are the thinnest blood vessels that help in gaseous exchange between the tissues.
The pulmonary circulation involves the right ventricle, lungs, and left atrium while the systemic circulation involves the left ventricle, body organs, and right atrium.