Question 1

Which of the following blood vessels carries deoxygenated blood from the heart to the lungs?

Accepted Answer

Pulmonary artery. The pulmonary artery is unique because it carries oxygen-poor blood away from the heart. It specifically transports this blood to the lungs for gas exchange. Most other arteries in the body carry oxygenated blood.

Question 2

What is the normal blood pressure range for a healthy adult human?

Accepted Answer

120/80 mmHg. A reading of 120/80 mmHg is generally considered the standard for healthy blood pressure. The top number represents systolic pressure, while the bottom number represents diastolic pressure. Maintaining this range reduces the risk of cardiovascular diseases.

Question 3

Which part of the human heart is known as the natural pacemaker?

Accepted Answer

SA node. The Sinoatrial (SA) node initiates the electrical impulses that set the heart's rhythm. It is located in the upper wall of the right atrium. If this node fails, artificial pacemakers are often surgically implanted.

Question 4

In which part of the blood are nutrients, hormones, and waste products primarily transported?

Accepted Answer

Plasma. Plasma is the liquid component of blood that makes up about 55% of its total volume. It serves as a medium for transporting essential substances and metabolic heat. Most of the water in our circulatory system is found within the plasma.

Question 5

Which of the following chambers of the human heart has the thickest muscular walls?

Accepted Answer

Left ventricle. The left ventricle has thick walls because it must pump blood to the entire body. It generates high pressure to overcome the resistance of the systemic circulation. In contrast, the right ventricle only pumps blood to the nearby lungs.

Circulatory System — Set 1