Biology

Respiration and Gas Transport

647 Questions

Respiration and gas transport deal with the physiological mechanisms of breathing, including the role of hemoglobin in oxygen transport and the removal of carbon dioxide from the blood. Questions cover both aerobic and anaerobic processes, along with related phenomena like altitude sickness. This human biology topic is a staple in the science sections of competitive tests.

Oxygen and hemoglobin transportAnaerobic respiration effectsCarbon dioxide removalAltitude sickness causesBreathing rate regulation

Respiration and Gas Transport Questions

Multiple choice biology food and it's constituents functions and principal sources of lipids chemical organization in living beings lipids

Number of oxygen atoms in lipid molecules is always ......... as compared to number of carbon atoms

  1. Less

  2. More

  3. Equal

  4. Double
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Lipid is formed by ester linkage of the glycerol molecule with three fatty acid molecules. The reaction by which the lipids are formed is known as dehydration. It is an important constituent of the cell membrane. It has the hydrophobic tail which does not interact with water. A lipid molecule has six oxygen and nine carbon atom. The carbon atom can vary depending on the R group attached to the fatty acid.
So, the correct answer is option A.
Multiple choice evs transportation in living organisms blood in humans circulatory system - blood basics of blood and heart

Which of the following statements is true about RBCs in humans?

  1. They carry about 20-25 per cent of $CO _{2}$.
  2. They transport 99.5 per cent of $O _{2}$.

  3. They transport about 80 per cent oxygen only and the rest 20 per cent of it is transported in dissolved state in blood-plasma.
  4. They do not carry $CO _{2}$ at all.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nearly 20-25% of $CO _{2}$ is transported by RBCs whereas 70% of it is carried as bicarbonate in plasma. About 7% of $CO _{2}$ is carried in a dissolved state through plasma. About 97% of $O _{2}$ is carried by RBCs in the blood. About 3% of $O _{2}$ Is transported in a dissolved state through the plasma.

So, the correct answer is 'They carry about 20-25 per cent of 
CO2CO2'

Multiple choice evs transportation in animal and plants blood in humans circulatory system - blood basics of blood and heart

Platelets helps in 

  1. Transport of gases

  2. Clotting

  3. Fight against disease

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
When an injury or a trauma occurs platelets are exposed to air this phenomenon stimulates the platelets to start the clotting process. These platelets react with the protein called fibrinogen with the help of vitamin k and calcium. Fibrinogen forms a mesh of tiny threads that collects red blood cells, which plug the open blood vessels as it dries. This is called a clot. Hence platelets help in clotting.
So, the correct answer is 'Clotting'.
Multiple choice evs transportation in living organisms blood in humans circulatory system - blood basics of blood and heart

Hemoglobin in the RBCs helps in the 

  1. Transport of oxygen

  2. Transport of nutrients

  3. Transport of carbon dioxide

  4. Both A and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hemoglobin (Hb or Hgb ) is an iron-containing protein present in erythrocytes or Red blood cells(RBC) of almost all vertebrates. Each hemoglobin is made up of 4 subunits, 2 alpha subunits and 2 beta subunits. Each subunit surrounds the central heme group that contains iron and binds to one oxygen molecule. Hence each hemoglobin molecule can bind to four oxygen molecules. It carries oxygen from lungs to tissues. It also helps in the transportation of carbon dioxide, hydrogen ions back to the lungs from the tissues. Hence haemoglobin in the RBCs helps in the transport of oxygen and carbon dioxide.

So, the correct answer is 'Both A and C'.

Multiple choice evs transportation in living organisms blood in humans circulatory system - blood basics of blood and heart

In carbon monoxide poisoning there is?

  1. Increase in carbon dioxide concentration

  2. Decrease in oxygen availability

  3. Decrease in free haemoglobin

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Carbon monoxide binds to haemoglobin with much higher affinity than oxygen, forming carboxyhaemoglobin. This effectively reduces the amount of free haemoglobin available to transport oxygen.

Multiple choice evs transportation in living organisms blood in humans circulatory system - blood basics of blood and heart

Choose the right sequential phenomena among the following during the delivery of $O _2$ from blood tissue.
P : Absorption of $CO _2$ by the blood.
Q : Reaction of absorbed $CO _2$ with $H _2O$ to form $H _2CO _3$ within RBC and its conversion into $H^+$ and $HCO^{-} _{3}$ ions in the presence of carbonic anhydrase enzyme.
R : Reaction of absorbed $CO _2$ with $H _2O$ in plasma to form $H _2CO _3$ and its conversion into $H^+$ and $HCO^{-} _{3}$ ions in the presence of carbonic anhydrase enzyme.
S : Combination of $H^+$ with heme portion of $HbO _2$ to release $O _2$.
T : Combination of $HCO^{-} _{3}$ with heme portion $HbO _2$ to form reduced hemoglobin and release of $O _2$.

  1. P, Q, T

  2. P, R, S

  3. P, Q, S

  4. P, R, T
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The sequence is: P (CO2 absorption), Q (formation of H+ and HCO3- in RBC via carbonic anhydrase), and S (H+ ions bind to HbO2, causing the release of O2 via the Bohr effect).

Multiple choice

What is hemoglobin?

  1. A part of your blood

  2. A part of your fingernail

  3. A monster

  4. A part of your hair
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hemoglobin is a protein found in red blood cells that carries oxygen throughout the body. It is a vital component of human blood.

Multiple choice evs our body- its internal organ system leucocytes body fluids and immune responses respiratory and circulatory system

Which blood cells transport oxygen?

  1. Red

  2. White

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Erythrocytes or red blood cells (RBC) are the most abundant of all the cells in blood. A healthy adult man has, on an average, 5 millions to 5.5 millions of RBCs per cubic mm of blood. RBCs are formed in the red bone marrow in the adults. RBCs are devoid of nucleus in most of the mammals and are biconcave in shape. They have a red coloured, iron containing complex protein called haemoglobin, hence the colour and name of these cells. These molecules play a significant role in transport of respiratory gases like oxygen and carbon dioxide.