CLASS 6 BIOLOGY Circulatory System:

What are the two basic requirements for all living organisms to survive?

Which system in the human body transports substances from one part to another?

Approximately how many liters of blood are in an adult human body?

Which of the following is NOT a major component of the circulatory system?

What is the double-layered membrane surrounding the heart called?

What are the upper chambers of the heart called?

What is the function of the atrioventricular valves?

Which type of blood vessel carries blood away from the heart?

Which blood vessels have very thin walls, only one cell thick?

Which part of the blood is mostly water?

What is the main function of red blood cells?

Which component of blood helps in clotting?

What is the major vein that empties blood into the right auricle?

Which artery carries blood to the lungs?

What is the circulation of blood between the heart and the lungs called?

What is the name of the instrument used to amplify the sound of a heartbeat?

What is measured using a sphygmomanometer?

Which blood type is known as the universal donor?

Which blood type is known as the universal recipient?

What is a voluntary act of donating blood called?

Why is the circulatory system essential for survival in larger organisms?

What is the functional significance of the septum in the human heart?

Which characteristic distinguishes arteries from veins in terms of blood flow dynamics?

How do red blood cells facilitate oxygen transport throughout the body?

Why is the double circulation system in humans considered more efficient than a single circulation system?

What role do white blood cells play in maintaining overall health?

How does the structure of capillaries facilitate their function in nutrient and waste exchange?

What is the underlying mechanism for the sound produced during a heartbeat?

How does regular exercise contribute to heart health?

What is the significance of knowing one's blood group for blood transfusions?

Which blood vessel is responsible for carrying deoxygenated blood from the right ventricle to the lungs?

What is the role of platelets in the blood?

Which of the following is a key difference between pulmonary and systemic circulation?

What is the primary risk associated with prolonged high blood pressure?

If a person has blood type A, which antibodies are present in their plasma?

What is the correct sequence of blood flow in pulmonary circulation?

Why is blood donation considered a voluntary act?

Which of the following dietary habits is most beneficial for maintaining a healthy heart?

What is the primary function of the vena cava?

How does a stethoscope amplify the sound of a heartbeat?

If a patient with blood type B requires a blood transfusion but only blood types AB and O are available, what is the primary reason blood type AB would be a less suitable choice than blood type O?

In a scenario where a patient's blood pressure consistently reads 160/100 mmHg, despite lifestyle modifications, what is the most critical physiological consequence to monitor?

During intense physical activity, the body's demand for oxygen increases. What physiological mechanism ensures that the heart meets this increased demand?

A researcher is investigating the factors influencing blood flow velocity in different types of blood vessels. Which of the following statements accurately describes the relationship between vessel type and blood flow velocity?

A patient with a history of atherosclerosis experiences a sudden blockage in a coronary artery. What is the most immediate and life-threatening consequence of this blockage?

How does the structure of capillaries—being only one cell layer thick—optimize their function in the circulatory system?

What is the physiological basis for the 'lub-dub' sound produced by the heart, and what do these sounds signify in terms of heart valve function?

Individuals with blood type O are considered universal donors because their red blood cells lack A and B antigens. However, in specific circumstances, why might transfusing type O blood to a recipient with a different blood type still pose a risk?

A scientist is studying the effect of a new drug on blood pressure. The drug selectively blocks the action of Angiotensin II, a potent vasoconstrictor. What is the expected outcome of administering this drug to a hypertensive patient?

Following a severe injury, a patient experiences significant blood loss and requires a blood transfusion. However, due to an administrative error, the patient receives blood that is not compatible with their blood type, leading to an acute hemolytic transfusion reaction. What is the underlying mechanism causing the primary life-threatening consequence in this scenario?

The circulatory system transports substances throughout the body using blood.

The heart is located in the abdominal cavity.

Arteries carry blood away from the heart.

Veins typically carry oxygen-rich blood.

Capillaries have thick walls to withstand high blood pressure.

Plasma is the liquid part of the blood.

Red blood cells (RBCs) are responsible for fighting infections.

Platelets help in the clotting of blood.

The aorta carries blood from the right ventricle to all parts of the body.

Pulmonary circulation involves blood flow between the heart and the lungs.

Systemic circulation involves blood flow between the heart and all body organs including the lungs.

A heart beat is the sound produced when blood passes through the arteries.

A sphygmomanometer is used to measure pulse rate.

People with blood group O are called universal recipients.

Blood group is determined by the presence of antibodies on red blood cells.

The circulatory system relies solely on diffusion to transport substances throughout the body.

The human heart is located centrally in the chest cavity.

Atrioventricular valves allow blood to flow both from the auricles to the ventricles and from the ventricles back to the auricles.

The pulmonary artery carries oxygen-rich blood from the heart to the lungs.

Arteries have valves to prevent the backflow of blood.

Plasma constitutes approximately 50% of the total blood volume.

Erythrocytes, or red blood cells, are responsible for fighting infections in the body.

Platelets facilitate blood clotting by releasing haemoglobin at the site of injury.

The vena cava carries oxygenated blood from the body organs to the left auricle of the heart.

During pulmonary circulation, blood flows from the right ventricle to the left auricle via the aorta.

The sound of a heartbeat is produced by the contraction of the heart muscles.

A sphygmomanometer measures the pulse rate by amplifying the sound of the heartbeat.

Individuals with blood group O have both A and B antigens on their red blood cells.

A person with blood type AB can donate blood to individuals with blood types A, B, and O.

Consuming a diet high in oily and fried foods is beneficial for maintaining heart health.

All living organisms need food and ______ to survive.

The human transport system carries substances from one part of the ______ to another.

The three major parts of the circulatory system are the heart, blood vessels and ______.

The heart is protected by the rib ______.

The upper chambers of the heart are called ______ or atria.

The blood is carried to different parts of the body through blood ______.

[Blank] carry blood away from the heart.

[Blank] help to carry the blood towards the heart.

The liquid part of blood is called ______.

Red blood cells are red due to the presence of ______.

[Blank] help in the clotting of blood.

The circulation of blood through the heart twice is called ______ circulation.

The circulation of blood between the heart and lungs is called ______ circulation.

The instrument to measure heartbeat is called a ______.

Blood group O is called universal ______.

The circulatory system transports substances throughout the body with the help of ______.

The human heart has four chambers: two upper small chambers called ______ and two lower large chambers called ventricles.

[Blank] are blood vessels that carry blood away from the heart to all parts of the body.

The liquid part of the blood, called ______, is yellowish in color and consists of 90% water.

[Blank], also known as erythrocytes, contain hemoglobin, a red-colored pigment responsible for carrying oxygen.

[Blank], or leukocytes, play a vital role in the body's defense by destroying germs and fighting infection.

The ______, also called thrombocytes, are responsible for the clotting of blood to prevent excessive blood loss after an injury.

The impure blood from the body enters the right auricle through two major veins called ______.

Exchange of gases takes place in the ______, where carbon dioxide is removed from the blood and oxygen is absorbed.

Blood circulates through the heart twice in one complete round, which is known as ______.

Contraction of the heart causes blood to flow through the arteries, producing a force or pressure, and the closing of valves creates a sound called ______.

The throbbing sound felt in arteries due to the expansion of their walls when blood is forced into the aorta is called ______.

The instrument used to measure blood pressure is called ______.

People with blood group ______ are called universal donors because their red blood cells have no antigens.

What is the human body's transport system called?

Name the three major components of the circulatory system.

Name the blood vessels that carry blood away from the heart.

Which blood vessels carry blood towards the heart?

What is the fluid part of the blood called?

Name the red-colored pigment present in RBCs.

Which type of blood cells help in fighting infection?

What instrument is used to measure heartbeat?

What instrument is used to measure blood pressure?

People with which blood group are called universal donors?

Explain why the circulatory system is essential for multicellular organisms, especially when considering the limitations of diffusion.

Describe the structural adaptation of capillaries that facilitates the exchange of substances between blood and body tissues.

How does the structure of arteries differ from that of veins, and how do these differences relate to their respective functions in the circulatory system?

Explain the importance of the septum in the human heart. What would be the consequence if this were absent?

Describe how the pulmonary artery and pulmonary vein are exceptions to the general rule that arteries carry oxygenated blood and veins carry deoxygenated blood.

Explain the role of hemoglobin in red blood cells and its significance for oxygen transport in the body.

How do white blood cells protect the body from infection, and what is the importance of this function?

Describe the role of platelets in blood clotting and explain why this process is essential for maintaining homeostasis.

Distinguish between pulmonary circulation and systemic circulation, highlighting the specific pathways each circuit takes.

Explain the connection between heart rate, pulse, and blood pressure, and how these parameters reflect the overall function of the cardiovascular system.

Describe how a stethoscope is used to measure heartbeat and what the different components of this instrument do.

A person has blood type AB. Explain what antigens and antibodies are present in their blood, and why they are considered universal recipients.

Why are individuals with blood type O considered universal donors, and what limitations do they face when receiving blood transfusions?

Explain how regular exercise can reduce the risk of heart disease, referencing specific benefits mentioned in the text.

Describe three specific dietary recommendations from the text that contribute to maintaining a healthy heart and circulatory system.

Explain why the structure of capillaries, being only one cell thick, is essential for their function in the circulatory system.

How does the double circulatory system in humans contribute to a more efficient delivery of oxygen to the body compared to a single circulatory system?

Describe the implications of having a reduced number of platelets in the blood, such as in the case of dengue fever, and explain why this condition can be life-threatening.

Explain how the structure of the heart, specifically the presence of valves and the septum, ensures unidirectional blood flow and prevents the mixing of oxygenated and deoxygenated blood.

Discuss how lifestyle factors such as diet and exercise play a critical role in maintaining healthy blood pressure and preventing hypertension.

Explain how the 'universal donor' and 'universal recipient' blood type designations are determined and why these classifications are critical in blood transfusions.

Describe the functions of the three types of blood cells and explain how a deficiency in any one type can lead to specific health problems.

Contrast the structural and functional differences between arteries and veins, and explain how these differences support their respective roles in blood circulation.

Describe the role of haemoglobin in red blood cells and explain how its structure allows it to efficiently transport oxygen throughout the body.

Explain what the systolic and diastolic pressure measurements represent in blood pressure readings, and how these values provide insight into cardiovascular health.