Selina solutions concise biology class 6 icse Solutions for Chapter 6 the circulatory system

Practice Question:

During surgical operations or during accidents, the patient may be given blood from outside to save his life. What is the technical name of the process? Briefly explain the precautions to be taken in the process.

Q1) Name the three kinds of blood vessels found in human beings. With the help of suitable diagrams, differentiate between them.

Q2) State briefly the difference between white blood cells and the red blood cells.

Q3) You can see some blood vessels on the outside of the hands especially in older people. Are those veins or arteries? How can you confirm your answer?

Q4) Given alongside is a diagram of the human heart showing its internal structures. Label the parts marked 1-6 and answer the following questions.

1. Which types of blood is carried by the blood vessel marked 2?
2. Name the main artery which takes the blood from the heart to different parts of the body?
3. Which chamber of the heart receives deoxygenated blood from the body?
4. Which chamber of the heart receives oxygenated blood from the lungs?

Q1) Put a tick against the correct alternative in the following statements:

1. The only artery which carries deoxygenated blood is called,

(a)Hepatic artery

(b) Pulmonary artery

(c)Aorta

(d)Renal artery

2. Pulmonary vein carries

(a)Oxygenated blood

(b)Deoxygenated blood

(c)Glucose-deficient blood

(d)CO2 laden blood

3. The function of WBCs is to

(a)Transport Oxygen

(b)Help in the clotting of blood

(c)Provide immunity

(d)Provide storage of blood

4. Blood capillary is a

(a)Broad tube

(b)An artery with thick wall

(c)Vein with a large lumen

(d)A narrow tube made up of endothelium only.

5. The nucleus is absent in

(a)RBCs

(b)WBCs

(c)All blood cells

(d)Liver cells

6.Sphygmomanometer measures:

(a)Pulse Rate

(b)Heart Beat

(c)Blood Pressure

(d)Brain activity

7. The blood tastes saltish due to the presence of dissolved

(a)Sodium chloride

(b)Potassium Chloride

(c)Ammonium Chloride

(d)Sodium nitrate

Q1) Differentiate between the following pairs:

1. Platelets and WBC
2. Pulmonary artery and pulmonary vein
3. Vena cava and aorta
4. RBC And WBC

Q2) Give any three differences between an artery and a vein:

Q3) Blood consists of two parts- a liquid part and a cellular part. Name these arts and briefly write about them.

Q4) What is the role of haemoglobin in the blood?

Q5) Fill in the blanks

1. The colour of a red blood cell is due to _______
2. The two lower chambers of the heart are called _______.
3. The blood plasma contains a dissolved substance such as nutrient, ______, _______ and _________.
4. The ________ artery takes the blood from the ventricles to the lungs.
5. The instrument used to find out the blood pressure is known as a __________.
6. The blood loaded with carbon dioxide from the body comes into the _______ of the heart.
7. The oxygen-rich blood from the lungs comes into the _______ of the heart.
8. The oxygen-rich blood is pumped into different parts of the body through the _____.
9. The carbon-dioxide loaded blood from the right ventricle is pumped into the lungs through the _______artery.
10. The liquid part of coagulated blood is known as ______.

Q6) In which organ of your body does blood get oxygenated?

Q7) Which side of the heart (left or right) contains oxygenated blood?

Q8) Name the disease in which the number of platelets reduces to 25.000 – 30,000 per cubic mm of blood. State its major symptoms.