Question

Which is true?
A) $H^+$ ions released from the carbonic acid combine with haemoglobin to form haemoglobin acid
B) Oxyhaemoglobin of erythrocytes is alkaline
C) More than 70% of carbon dioxide is transferred from tissue to lungs as carbamino compounds
D) In a healthy person, haemoglobin content is more than 25g/100ml
E) In the lungs oxygen from alveoli reaches blood through active transport

Answer 1

Liquids and solids make up your blood. Plasma, the liquid component, is made up of water, salts, and protein. Plasma makes up more than half of your blood. Red blood cells, white blood cells, and platelets make up the solid component of your blood.

Complete answer:
Option A: H+ ions released from the carbonic acid combine with haemoglobin to form haemoglobin acid: When hydrogen ions interact with haemoglobin inside red blood cells, haemoglobin acid is produced. The dissociation of carbonic acid in the presence of carbonic anhydrase produces hydrogen ions, which aid in the dissociation of oxygen from haemoglobin. Thus, this is the correct option.

Option B: Oxyhaemoglobin of erythrocytes is alkaline: As oxyhaemoglobin is a strong acid, it binds to ions. Increased blood acidity: - Because oxyhaemoglobin is a powerful acid, it causes the blood to become more acidic. Thus, this is not the correct answer.

Option C: More than 70% of carbon dioxide is transferred from tissue to lungs as carbamino compounds: In humans, carbon dioxide travels as a gas dissolved in the liquid component of the blood, where it forms bicarbonate ions with haemoglobin protein molecules. More than two-thirds of carbon dioxide, or around 70%, is transported in this manner. Thus, this is not the correct option.

Option D: In a healthy person, haemoglobin content is more than 25g/100ml: haemoglobin concentration is measured in grams per 100 millilitres. The typical range is 11.5 to 17.5 grams per 100 millilitres. Thus, this is not the correct option.

Option E: In the lungs oxygen from alveoli reaches blood through active transport: Within the air sacs, oxygen travels through paper-thin walls to small blood arteries known as capillaries, where it is absorbed into your blood. The oxygen is then carried around your body by a protein called haemoglobin, which is found in red blood cells. Thus, this is not the correct option.

Thus, the answer is option ‘A’ i.e, $H^+$ ions released from the carbonic acid combine with haemoglobin to form haemoglobin acid.

Note: Hemoglobin is the chemical that gives red blood cells their colour and permits oxygen to be transported throughout the body. Anaemia is caused by low haemoglobin levels, which produces symptoms such as tiredness and difficulty breathing.