Question

The correct order of systemic circulation in a heart :
A. Aorta
B. Aortic valve
C. Left ventricle
D. Superior and inferior venae cavae
E. Right atrium

• A. A, B, C, D and E
• B. B, C, D, E and A
• C. D, B, C, A and E
• D. C, B, A, D and E

Hint:

Remember the two main loops. Systemic circuit: Left side of Heart $\rightarrow$ Body tissues $\rightarrow$ Right side of Heart. Pulmonary circuit: Right side of Heart $\rightarrow$ Lungs $\rightarrow$ Left side of Heart.

Answer 1

The Correct Option is D

Step 1: Concept:
This question requires mapping out the systemic circulation pathway, which is the extensive portion of the cardiovascular system responsible for delivering oxygenated blood to all body tissues and returning deoxygenated blood back to the heart.

Step 2: Step-by-step Explanation:

• The systemic circuit officially begins its powerful outward journey from the Left ventricle (C). This chamber has the thickest myocardial wall to generate the high pressure needed to pump blood throughout the entire body.

• During ventricular contraction (systole), the high pressure forces oxygenated blood to eject through the semilunar Aortic valve (B), which opens outward and subsequently snaps shut to prevent regurgitation (backflow) into the ventricle.

• The blood immediately enters the Aorta (A), the largest and most elastic artery in the human body. The aorta branches extensively into smaller arteries, arterioles, and capillaries, delivering oxygen and nutrients to systemic tissues.

• After cellular respiration occurs at the tissue level, the now deoxygenated, carbon dioxide-rich blood travels back toward the heart through venules and veins, eventually draining into the two largest veins in the body: the Superior and inferior venae cavae (D).

• These massive veins empty their deoxygenated blood load directly into the Right atrium (E) of the heart, successfully completing the systemic circulatory loop.

• Consequently, the correct chronological sequence is C $\rightarrow$ B $\rightarrow$ A $\rightarrow$ D $\rightarrow$ E.

Step 3: Final Answer:
Option (D) correctly outlines this physiological pathway.