The Circulatory System

Class 10 Biology Chapter 7
The Circulatory System
Important Questions

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Here, you'll find important questions related to Chapter 7 The Circulatory System For ICSE Class 10 Biology. These questions have been crafted to assist students in their preparation for the ICSE Class 10 Biology Examination in 2023–24. By practising various question types, students can clarify their doubts, enhance their exam readiness, boost their confidence, and refine their problem-solving skills


The circulatory system, a remarkable network of vessels, organs, and blood, serves as the lifeblood of our bodies, quite literally. As we embark on our journey to unravel the intricacies of this vital biological system, we delve into the Fifth chapter of ICSE Class 10 Biology, titled "The Circulatory System." This chapter offers a captivating exploration of how the human body transports oxygen, nutrients, and waste products to sustain life. In the pursuit of a comprehensive understanding of this crucial system, students often seek guidance and clarity on essential concepts. To aid in your preparations for the ICSE Class 10 Biology examination, we have compiled a set of biology important questions for Class 10 ICSE, specifically tailored to the topic of the circulatory system. These important questions of biology Class 10 ICSE are designed to reinforce your knowledge and help you excel in your studies. Join us on this educational voyage as we uncover the intricacies of the circulatory system and address pertinent biology questions for Class 10 ICSE.

What is The Circulatory System?

The circulatory system, often referred to as the cardiovascular system, is a complex network of blood vessels, the heart, and blood itself that plays a fundamental role in the human body. Its primary function is to transport vital substances, such as oxygen, nutrients, hormones, and waste products, throughout the body to nourish cells, maintain homeostasis, and support various bodily functions

Key components of the circulatory system include:

Heart: The heart is a muscular organ responsible for pumping blood throughout the body. It consists of four chambers: two atria (upper chambers) and two ventricles (lower chambers), which work together to ensure that oxygenated blood is sent to the body's tissues and deoxygenated blood is returned to the lungs for oxygenation.
Blood Vessels: Blood vessels are a network of tubular structures that carry blood to and from the heart. There are three main types of blood vessels:

  • Arteries: These carry oxygenated blood away from the heart to the body's tissues.
  • Veins: Veins transport deoxygenated blood back to the heart.
  • Capillaries: These are tiny, thin-walled vessels that connect arteries and veins. Capillaries enable the exchange of oxygen, nutrients, and waste products between the blood and body cells.

Blood: Blood is the transport medium of the circulatory system. It consists of red blood cells (erythrocytes) that carry oxygen, white blood cells (leukocytes) that help fight infections, and platelets (thrombocytes) that aid in blood clotting. Plasma, a liquid component of blood, carries various substances, including hormones and nutrients.
Circulation: Blood circulates through two main circuits in the body:

  • Systemic Circulation: This circuit carries oxygenated blood from the left side of the heart to the body's tissues and returns deoxygenated blood to the right side of the heart.
  • Pulmonary Circulation: This circuit transports deoxygenated blood from the right side of the heart to the lungs, where it is oxygenated, and then returns oxygenated blood to the left side of the heart.

The circulatory system plays a critical role in maintaining the body's overall health and ensuring that all cells receive the necessary oxygen and nutrients for survival. It also helps regulate temperature, transport hormones, and defend against infections. Understanding the circulatory system is essential in the field of biology, particularly for students studying Class 10 ICSE Biology, where it is often a topic covered in depth.

icse biology class 10 circulatory system important questions

Class 10 Biology The Circulatory System Important Questions and Answers

Q1. Blood pressure is :


(a) The pressure of blood on the heart muscles
(b) The pressure of blood exerted on the walls of arteries and veins
(c) The pressure of blood on the walls of veins only
(d) The pressure of blood on the walls of arteries only

Ans. (d)

Blood pressure is the pressure which blood flowing through arteries exerts on their walls. It has 2 limits: upper limit (systolic pressure) occurs when fresh blood is pushing through the arteries due to ventricular contraction of the heart. Lower limit (diastolic pressure): recorded when a wave has passed over. Range of normal blood pressure:
Systolic : 100-140 mm Hg
Diastolic : 60-80 mm Hg

Q2. The middle layer of the artery and vein is called tunica media. It consists of _________.


(a) Squamous epithelial cells
(b) Smooth muscle and elastic fibres
(c) Endothelial cells
(d) Connective tissue

Ans. (b)
There are three layers in the artery and veins. They are:
Tunica interna: consists of endothelial cells.
Tunica media: consists of smooth muscles and elastic fibres.
Tunica externa: consists of connective tissue.

Q3. Why is the circulatory system also known as a transport system ?

Circulatory system is also called a transport system because it transports food, water, hormones, enzymes, electrolytes, antibodies and respiratory gases to or away from the body tissues.

Q4. Man can live without food for a number of days, but he cannot survive without O2 for more than a few minutes, why?

A man can live without food for a number of days, but he cannot survive without oxygen for more than a few minutes because food is stored in the body in various forms like proteins, glycogen, fats, etc. so the stored food material and energy can be used but oxygen is not stored in the body in any form. Hence, deficiency of oxygen leads to asphyxiation and finally the person dies.

Q5. Write the function of Pericardium.


  • Pericardium represents a membrane that surrounds the heart structure.


  • Pericardium provides mechanical protection to the heart.
  • Pericardium also serves as a lubricating agent to avoid friction between the heart and the adjoining tissues.
icse biology class 10 circulatory system important questionsicse biology class 10 circulatory system important questions

ICSE Class 10 Biology Chapter wise Important Questions

Chapter No. Chapter Name
Chapter 1 Structure of Chromosome, Cell Cycle and Cell division
Chapter 2 Genetics: Mendel's law of Inheritance
Chapter 3 Absorption by Roots- The Processes Involved
Chapter 4 Transpiration
Chapter 5 Photosynthesis
Chapter 6 Chemical Coordination in Plants
Chapter 7 The Circulatory System
Chapter 8 The Excretory System
Chapter 9 The Nervous System and Sense Organs
Chapter 10 The Endocrine System
Chapter 11 The Reproductive System
Chapter 12 Human Population
Chapter 13 Human Evolution
Chapter 14 Pollution


The circulatory system stands as one of the most remarkable and essential systems within the human body. offers a valuable resource in the form of a comprehensive collection of questions, making the study of the circulatory system, and indeed all aspects of biology, more accessible and engaging. These questions provide students with the opportunity to test their knowledge, deepen their understanding, and prepare effectively for examinations.

Frequently Asked Questions

Q1 : How does the human circulatory system work?

Ans: The human circulatory system is a network of arteries, veins, capillaries designed to provide essential minerals, nutrients, and other essential components to various parts of the body. It also collects metabolic waste to be filtered or expelled from the body.

Q2 : What are the three types of circulation?


  • Pulmonary Circulation
  • Systemic Circulation
  • Coronary Circulation

Q3 : Is the human circulatory system open or closed?

Ans: The human circulatory system is a closed system that pumps blood through a network of arteries and veins. This type of circulation is seen in all vertebrates and some invertebrates.

Q4 : What is the advantage of a closed circulatory system?

Ans:  In a closed circulatory system, more pressure is available in the system, and the blood can reach the body extremities much quicker. This translates to a much faster metabolism rate and quicker movements in organisms with closed circulatory systems.

Q5 : What is double circulation?

Ans: Double circulation is a system of circulation where the blood flows through the heart twice. This type of circulation is very effective as the body has a constant supply of oxygenated blood.

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