Q.3VCQ.. - Biology

Question

Which of the following statements about the circulatory system is false? 

a. Blood in the pulmonary vein is deoxygenated. 

b. Blood in the inferior vena cava is deoxygenated. 

c. Blood in the pulmonary artery is deoxygenated. 

d. Blood in the aorta is oxygenated.

Step-by-Step Solution

Answer

The statement about a circulatory system that is false is : 

a. Blood in the pulmonary vein is deoxygenated. 

The pulmonary artery carries deoxygenated blood to the lungs, where carbon dioxide is released and oxygen is absorbed during respiration. 

The arteries are then divided into very fine capillaries with extremely thin walls. 

Step 1: Introduction

• The system in which the transportation of blood and oxygen takes place through cylindrical vessels is called the circulatory system.
• There are two types: open circulatory system and closed circulatory system. 
• This works closely with the cardiovascular system. 
• Transportation occurs mainly through arteries and veins.

Step 2: Find the false statement

The pulmonary vein transports oxygenated blood from the lungs to the heart's left atrium.

Each lung has two pulmonary veins that transport blood to the atrium.

The incorrect alternative is (a).

Step 2: Explanation of the other options

• The inferior super nova collects the deoxygenated blood from the veins and sends it to the right atrium.  This blood then passes through the right ventricle. The superior super nova also works in a similar way.  They both are a part of a systemic circuit. 
• The deoxygenated blood from the right ventricle enters the pulmonary artery and transports it to the lungs. Both pulmonary artery and pulmonary vein are part of the pulmonary circuit. 
• Aorta is the largest artery. It transports the oxygenated blood received from the left ventricle to all the parts of the body.