Questions And Answers On Human Circulatory System

Question: What are the essential components of the Circulatory system?

Answer: Heart, Blood and Blood Vessels

Explanation: The Circulatory system, also called the Cardiovascular system is a network that transports nutrients and Oxygen to the cells and carries out the Carbon Dioxide generated from the cells.

Question: What carries nutrients and Oxygen to each cell?

Answer: Blood

Explanation: Blood is an important fluid in the body because it provides each cell with Oxygen and nutrients, and also helps remove the waste from the cells. There are three major types of Blood Cells: Red Blood Cell (RBC), White Blood Cells (WBC) and Platelets.
Blood has other important roles: like providing immunity to the body, transporting hormones and regulating the body temperature.

Question: What gives Blood its red colour?

Answer: Haemoglobin

Explanation: Red Blood Cells contains Iron-rich Haemoglobin, which gives Blood the red colour. Haemoglobin forms a reversible bond with Oxygen in the Lungs. As the Blood flows through the cells, the bond breaks, releasing the Oxygen. Haemoglobin also transports the waste Carbon-Dioxide created by the cells to the Lungs.

Question: Which Blood Cells provide immunity to the body?

Answer: White Blood Cells

Explanation: White Blood Cells (WBC), also called the Leukocytes are a part of the immune system that helps the body fight against different germs and infections by ingesting and destroying them.
WBC also produce antibodies that latch on to the foreign body and make them ineffective.

Question: Which Blood Cells help in clotting of the Blood?

Answer: Platelets

Explanation: If a Blood Vessel is torn due to an injury, all the nearby platelets join together and cover the torn area. This also creates a surface for the special protein called Fibrin, which helps in clotting of the Blood. Platelets, also called Thrombocytes are colourless cells.

Question: Which Blood Vessel transports Blood away from the Heart?

Answer: Arteries

Explanation: Arteries move Blood from the Heart to other parts of the body. They have a thick wall to avoid rupture from the pressure caused by the pumped Blood from the Heart. Most Arteries carry oxygenated Blood.

Question: Which Blood Vessel transports Blood back to the Heart?

Answer: Veins

Explanation: Veins have a thin wall and carry Blood from all parts of the body to the Heart. In most Veins, there are valves to prevent Blood flow in the opposite direction. Most Veins carry deoxygenated Blood.

Question: Arteries and Veins are joined by which Blood Vessel?

Answer: Capillaries

Explanation: Arteries are divided into tiny Blood Vessels near the tissue called Capillaries. They join back to form Veins. The actual transfer of Oxygen and nutrition between the Blood and the tissues takes place in the Capillaries.

Question: How many chambers are there in the Human Heart?

Answer: Four

Explanation: The Human Heart is a muscular organ that pumps Blood to the whole body. It is divided into four chambers to avoid mixing of the oxygenated and the deoxygenated Blood. The upper two chambers are called the Left and the Right Auricle and the lower two chambers are called the Left and the Right Ventricle.

Question: On which side of the Heart does the deoxygenated Blood flow?

Answer: Right side

Explanation: Deoxygenated Blood flows to the right side of the Heart. It first enters the Right Auricle and moves into the Right Ventricle and is then pumped to the Lungs. At the same time, the oxygenated Blood from the Lungs move into the left side of the Heart and is pumped to the rest of the body.

Question: Which Blood Vessel carries deoxygenated Blood from the Heart to the Lungs?

Answer: Pulmonary Artery

Explanation: The deoxygenated Blood from the right side of the Heart is pumped into the Pulmonary Artery that is connected to the Lungs. On the other hand, Pulmonary Veins carry oxygenated Blood from the Lungs to the left side of the Heart.

Question: Which device do the doctors use to measure the Heartbeat?

Answer: Stethoscope

Explanation: Heart rhythmically contracts and relaxes to pump Blood. This rhythmic contraction and relaxation together is called a Heartbeat. Stethoscope amplifies the sound, making it easier for the doctors to analyse the Heartbeat.