can anyone give some short questions from the chapter circulatory system for class 8
Answers
Which separates the left side from the right side of the heart?
They are also called erythrocyte?
They are also call thrombocyte?
They are also called Leukocyte?
Answer:
Short Answer Questions:
Question 1.
1. Differentiate between the following pair of terms:
(a) Pulmonary artery and pulmonary vein.
(b) Vena cava and aorta.
(c) Platelets and WBC.
(d) RBC and WBC
Solution: (a)
Pulmonary artery and pulmonary vein.
Pulmonary artery Pulmonary vein
The involves the transfer of blood from the heart to the lungs
This involves the transfer of blood to the heart from the lungs
Deoxygenated blood is carried
Oxygenated blood is carried
(b) Vena cava and Aorta
Vena cava Aorta
Vena cava is a large vein
Aorta is the large artery
It carries deoxygenated blood from the upper and lower parts of the body i.e. head and shoulders.
2. It carries oxygenated blood to all parts of the body through its branches.
(c) Blood platelets and blood group.
Platelets WBC
1. These are colourless, oval or round, cytoplasmic fragments 1. WBC is colourless and it has a lack of haemoglobin, bigger in quantity, and have different oval and lobed nucleus.
2. These are important for blood clotting 2. They provide immunity that protects our body from diseases.
3. Their life period is 3-5 days and it is called thrombocytes. 3. Their life period is short i.e. 5 to 20 days.
(d) RBC and WBC
RBC WBC
1. They do not have a nucleus at maturity. 1. They have a large characteristic nucleus.
2. They possess haemoglobin and are red. 2. They are colourless as they have no pigment.
3. They help in the transport of respiratory 3. They help in a defence mechanism.
Question 2.
Give any three differences between an artery and a vein:
Solution:
Following are the differences between the artery and a vein:
Artery Vein
1. Arteries transfer blood from the heart to various body parts. 1. Veins transfer blood from different body parts to the heart.
2. These carry oxygenated blood (except the pulmonary artery). 2. These carry deoxygenated blood (except the pulmonary vein).
3. Blood flows with high speed and under high pressure. 3. Blood flows with low speed and under low pressure.
Question 3.
Fill in the blanks
The two lower chambers of the heart are called _______
Solution:
The two lower chambers of the heart are called ventricles.
Question 4.
In which organ of our body does blood get oxygenated?
Solution:
Blood gets oxygenated in the lungs. The oxygenated blood is brought to the pulmonary veins, and it enters the left atrium. From the left atrium, the blood drains into the left ventricle. Next, the left ventricle pumps the blood to the aorta. The aorta will eventually pump the oxygenated blood to all the parts of the body.
Question 5.
Which side of the heart (left or right) contains oxygenated blood?
Solution:
Oxygenated blood is carried by the left side of the heart.
Question 6.
What is the role of haemoglobin in the blood?
Solution:
The respiratory pigment called haemoglobin, which is formed of the iron-containing part known as Haemin and protein part known as globin. It helps to transport respiratory gases (oxygen).
Question 7.
Name the disease in which the number of platelets reduces to 25,000 30,000 per cubic mm of blood. State its major symptoms.
Solution:
The number of platelets gets reduced to as low as 25-30 thousands per cubic mm of blood by a disease called dengue fever. The major symptoms of dengue are high fever, rashes or red spots on body, nausea or vomiting, pain in the abdomen, back, or back of the eyes and muscles.