Every question from this NCERT chapter, with a detailed explanation.
Consider the following statements about the ABO blood grouping: 1. It is based on surface antigens A and B on white blood cells. 2. Plasma contains natural antibodies against absent antigens. 3. Blood transfusion requires matching of blood groups. Which of the statements given above are correct?
Which structural feature characterises mature mammalian RBCs?
Assertion (A): The spleen is often referred to as the "graveyard of RBCs". Reason (R): The spleen acts as a filter of the blood, trapping blood-borne microorganisms.
Consider the following statements regarding plasma: 1. It constitutes nearly 55% of blood. 2. Water forms about 90-92% of plasma. 3. Plasma proteins contribute around 6-8%. 4. Serum is plasma with clotting factors. Which of the statements given above are correct?
Where are human Red Blood Cells (RBCs) primarily formed in adults?
Assertion (A): Red blood cells are the primary medium for the transport of oxygen in the human body. Reason (R): Haemoglobin inside RBCs reversibly binds with oxygen to form oxyhaemoglobin.
Who among the following can donate blood to individuals of any ABO group?
Which blood group can receive blood from all ABO groups?
Consider the following statements about the Rh factor: 1. Rh negative individuals never form anti-Rh antibodies. 2. About 80% of humans are Rh positive. 3. Rh matching is not required before transfusion. Which of the above are correct?
The condition of severe anaemia/jaundice in a newborn due to Rh incompatibility is called:
Which animals generally show an open circulatory system?
Assertion (A): The human heart is situated in the thoracic cavity between the lungs. Reason (R): The heart is protected by a double-walled membranous bag called the pericardium.
Which valves guard the openings between the right atrium and right ventricle, and the left atrium and left ventricle?
Which of the following correctly represents pulmonary circulation?
Hypertension is generally diagnosed when repeated blood pressure readings are at or above:
The valve located between the left atrium and the left ventricle is the:
Blood plasma from which the clotting factors have been removed is termed:
Which plasma protein is essential for the coagulation of blood?
Which plasma protein is primarily responsible for maintaining the osmotic balance of blood?
Which type of white blood cell is the least abundant in normal human blood?
Which leukocyte constitutes the highest percentage of the total white blood cell count?
The average lifespan of a human red blood cell is approximately:
Which human cells are characteristically enucleated and biconcave in shape?
Which blood group is designated as the universal donor?
Which blood group is considered the universal recipient?
The condition arising from Rh incompatibility between an Rh-negative mother and an Rh-positive foetus is known as:
Which mineral ion plays a critical role in the mechanism of blood clotting?
A reduction in the number of which blood cells can lead to clotting disorders and excessive bleeding?
Basophils are involved in inflammatory reactions and secrete:
Which of the following white blood cells are the main phagocytic cells responsible for engulfing pathogens?
Unlike most reptiles, crocodiles possess a heart with:
In a resting human adult, the duration of a single cardiac cycle is approximately:
The innermost layer of a blood vessel, the tunica intima, is composed of:
The tunica media (muscle layer) is comparatively thinner in: