Name the following: The iron containing pigment in erythrocytes.

Haemoglobin is an important component of blood which helps to transport oxygen from lungs to myoglobin present in muscle tissues which stores oxygen and transfers to various parts of the body whenever required. It is an iron-containing pigment found in the red blood cells of the humans. A single molecule of haemoglobin combines with four oxygen and carbon dioxide molecules.

Given below are sets of five terms each. Rewrite the terms in correct order in a logical sequence beginning with the first word that is underlined: Artery, Capillaries, Venule, Vein, Arteriole.

Blood vessels form a network of blood circulating vessels beginning from the heart(left ventricle) arteries, arterioles, capillaries, venules, veins posterior to the heart (right auricle). The blood pass to the aorta. As the aorta moves away from the heart. This branches into smaller arteries so that all parts of the body are furnished. The least of these are called arterioles. These arterioles branch into networks of very small blood vessels, the capillaries. The blood enters a network of the small venule, which support veins. These, in turn, carry the blood back to the atria of the heart. A r t e r i e s → A r t e r i o l e → C a p i l l a r i e s → V e n u l e → V e i n

Give suitable biological reasons for the given statement: Carbon monoxide is dangerous when inhaled.

Carbon monoxide when inhaled and absorbed into blood binds with haemoglobin and forms an irreversible complex called carboxy haemoglobin. The formation of this complex reduces the oxygen carrying of blood. Hence, carbon monoxide is highly dangerous when inhaled.

Mention the exact location of the following: (v) Pulmonary semilunar valve

The pulmonary semilunar valve, also known as the pulmonic valve, is one of the four major valves of the human heart. This is located between the junction of the right ventricle and pulmonary artery. The pulmonary vein carries out the deoxygenated blood to the lungs for re-oxygenation.

Choose between the two options to answer the question specified in the brackets for the following. An example is illustrated below. Example: Corolla or Calyx (Which is the miter whorl?) Answer: Calyx Blood in the pulmonary artery or pulmonary vein (Which one contains less oxyhaemoglobin?)

The artery that carries blood carry blood from the right side of the heart to the lungs is called the pulmonary artery. It carries deoxygenated blood. The wall of this blood vessel is thick and elastic. Hence, blood in the pulmonary artery contains less oxyhaemoglobin.

E M B I B E

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 9 - Circulatory System>ICSE-2019>Q 11

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Name the compound formed when haemoglobin combines with carbon dioxide in blood.

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Important Questions on Circulatory System

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 9 - Circulatory System>ICSE-2019>Q 12

Choose the correct answer from each of the four options given below:

While recording the pulse rate, where exactly does a doctor press on our wrist?

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 9 - Circulatory System>ICSE-2019>Q 13

Choose the correct answer from each of the four options given below:

A muscular wall is absent in:

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 9 - Circulatory System>ICSE-2019>Q 14

Identify the ODD term in each set and name the CATEGORY to which the remaining three belong:

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 9 - Circulatory System>ICSE-2019>Q 15

State the main functions of the following:

Coronary Artery.

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 9 - Circulatory System>ICSE-2020>Q 16

Given below are certain groups of terms. In each group, the first pair indicates a relationship between the two terms. Rewrite and complete the second pair on a similar basis.

Brain : Meninges :: Heart : _____.

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 9 - Circulatory System>ICSE-2020>Q 17

Given below are certain groups of terms. In each group, the first pair indicates a relationship between the two terms. Rewrite and complete the second pair on a similar basis.

Kidney: Renal artery :: Liver : _____.

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 9 - Circulatory System>ICSE-2018>Q 18

The organisation which procures and supplies blood during an emergency.

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 9 - Circulatory System>ICSE-2018>Q 19

Name the blood vessel which supplies blood to the liver.