The Circulatory System assertion reason questions for Class 10 ICSE
1.) Assertion (A): Capillaries have thin walls, allowing for the exchange of substances between blood and tissues.
Reason (R): Capillaries facilitate the diffusion of oxygen, nutrients, and waste products.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
2.) Assertion (A): Blood in the pulmonary veins is oxygenated.
Reason (R): The pulmonary veins transport blood from the lungs to the heart.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (b) Both A and R are False
3.) Assertion (A): The atrioventricular (AV) valves prevent the backflow of blood into the atria.
Reason (R): AV valves close when the ventricles contract, preventing blood from flowing back into the atria.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
4.) Assertion (A): Blood pressure is higher in the arteries than in the veins.
Reason (R): Arteries carry blood away from the heart, and the blood is under greater force from the pumping action of the heart.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
5.) Assertion (A): The lymphatic system plays a crucial role in maintaining fluid balance in the body.
Reason (R): Lymphatic vessels collect excess interstitial fluid and return it to the bloodstream.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
6.) Assertion (A): The left ventricle of the heart has thicker walls than the right ventricle.
Reason (R): The left ventricle pumps blood to the entire body, requiring more force.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
7.) Assertion (A): Blood viscosity is influenced by the concentration of red blood cells.
Reason (R): An increase in red blood cell count leads to higher blood viscosity.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
8.) Assertion (A): The cardiac cycle involves the alternating contraction and relaxation of the heart chambers.
Reason (R): During diastole, the heart chambers are relaxed and fill with blood.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
9.) Assertion (A): Blood in the pulmonary artery is deoxygenated.
Reason (R): The pulmonary artery carries blood from the right ventricle to the lungs for oxygenation.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (c) A is True and R is False
10.) Assertion (A): The heart is innervated by the autonomic nervous system.
Reason (R): The autonomic nervous system regulates the heart rate and rhythm.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
11.) Assertion (A): Blood in the superior vena cava is oxygenated.
Reason (R): The superior vena cava carries blood from the upper body to the right atrium.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (b) Both A and R are False
12.) Assertion (A): Blood in the inferior vena cava is deoxygenated.
Reason (R): The inferior vena cava carries blood from the lower body to the right atrium.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
13.) Assertion (A): The coronary arteries supply oxygen and nutrients to the heart muscle.
Reason (R): Coronary arteries branch off from the aorta and encircle the heart.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
14.) Assertion (A): Blood in the pulmonary veins is deoxygenated.
Reason (R): The pulmonary veins carry blood from the lungs to the left atrium.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (b) Both A and R are False
- Assertion (A): The lymphatic system plays a role in immune defense.
Reason (R): Lymph nodes contain white blood cells that help fight infection.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
16.) Assertion (A): Blood in the
pulmonary veins is oxygenated.
Reason (R): The pulmonary veins carry blood from the lungs to the left atrium.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (b) Both A and R are False
17.) Assertion (A): Blood pressure is the force exerted by blood against the walls of blood vessels.
Reason (R): Blood pressure is measured in millimeters of mercury (mmHg).
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
18.) Assertion (A): The aortic valve prevents the backflow of blood into the left ventricle.
Reason (R): The aortic valve closes when the left ventricle relaxes, preventing blood from flowing back into the ventricle.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
19.) Assertion (A): Blood in the pulmonary artery is oxygenated.
Reason (R): The pulmonary artery carries blood from the right ventricle to the lungs for oxygenation.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (c) A is True and R is False
20.) Assertion (A): Blood viscosity is influenced by the concentration of plasma proteins.
Reason (R): An increase in plasma protein concentration leads to higher blood viscosity.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
21.) Assertion (A): The tricuspid valve is located between the right atrium and right ventricle.
Reason (R): The tricuspid valve prevents the backflow of blood from the right ventricle to the right atrium.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
22.) Assertion (A): Blood in the coronary veins is oxygenated.
Reason (R): Coronary veins carry oxygenated blood from the heart muscle to the right atrium.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (b) Both A and R are False
23.) Assertion (A): The lymphatic system helps maintain blood pressure.
Reason (R): Excess interstitial fluid collected by lymphatic vessels reduces the overall blood volume.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
24.) Assertion (A): The foramen ovale allows blood to pass from the right atrium to the left atrium in the fetal heart.
Reason (R): The foramen ovale closes after birth, separating the two atria.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
25). Assertion (A): Blood in the coronary veins is deoxygenated.
Reason (R): Coronary veins carry deoxygenated blood from the heart muscle to the right atrium.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (b) Both A and R are False
26.) Assertion (A): The lymphatic system plays a role in absorbing and transporting dietary fats.
Reason (R): Lymphatic vessels called lacteals absorb fat molecules from the digestive tract.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
27.) Assertion (A): Blood in the systemic arteries is oxygenated.
Reason (R): Systemic arteries carry blood from the left ventricle to the body tissues.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (c) A is True and R is False
26.) Assertion (A): Blood is responsible for transporting hormones throughout the body.
Reason (R): Hormones are released into the bloodstream by endocrine glands.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
27.) Assertion (A): The lymph nodes filter and purify lymph.
Reason (R): Lymph nodes contain immune cells that help fight infections.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
28.) Assertion (A): Blood is a liquid connective tissue.
Reason (R): Connective tissues are characterized by cells embedded in an extracellular matrix.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
- ) Assertion (A): The heart’s electrical impulses are coordinated by the atrioventricular (AV) node.
Reason (R): The AV node delays the transmission of electrical signals to allow the atria to contract before the ventricles.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
30.) Assertion (A): Blood is pumped through the circulatory system by the contraction and relaxation of the heart.
Reason (R): The heart undergoes a rhythmic cycle of contraction (systole) and relaxation (diastole).
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
31.) Assertion (A): The pericardium is a protective membrane surrounding the heart.
Reason (R): The pericardium prevents friction between the heart and surrounding structures.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
32.) Assertion (A): Blood vessels have three layers: the tunica intima, tunica media, and tunica externa.
Reason (R): These layers provide strength, elasticity, and support to blood vessels.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
33.) Assertion (A): Arteries carry oxygenated blood, except for the pulmonary artery.
Reason (R): The pulmonary artery carries deoxygenated blood from the heart to the lungs.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
34.) Assertion (A): The cardiac cycle consists of systole and diastole.
Reason (R): Systole is the contraction phase, and diastole is the relaxation phase of the heart.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
35.) Assertion (A): Blood in the veins is blue.
Reason (R): Deoxygenated blood appears blue when viewed through the skin.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (b) Both A and R are False