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

Which of the following is a false statement?

  1. People living at high altitude have greater red blood cell concentration.

  2. The maximum haemoglobin concentration is 34 g in 100 ml red blood cells.

  3. The number of haemoglobin in one red blood cell is 28 to 30.

  4. Red blood cells contain large quantity of carbonic anhydrage enzyme.

  5. Red blood cell has convex disc-like structure.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

False statement

Multiple choice

Erythropoesis is decreased in/at

  1. hypoxia

  2. anaemia

  3. high altitudes

  4. heavy exercise

  5. complete bed rest
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

During complete bed rest, rate of red blood cell production decreases.

Multiple choice

Identify the false statement.

  1. Life span of a red blood cell is 120 days.

  2. Red blood cell have no mitochondria.

  3. Daily loss of iron is 6 g/day.

  4. Iron is absorbed by small intestine.

  5. Iron is stored in form of haemosiderin.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Wrong statement

Multiple choice

Which of the following statements is/are false? a. RBCs are red coloured due to the presence of haemoglobin. b. Haemoglobin is a carrier of carbon dioxide. c. Whenever there is a blood flow due to an injury, the platelets help in the clotting of blood.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only a and c

  5. Only c
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Haemoglobin is a carrier of carbon dioxide, is a wrong statement. Haemoglobin is the carrier of oxygen. Hence, this is the correct option.

Multiple choice

Which pigment helps in the transportation of oxygen in humans?

  1. Leghaemoglobin

  2. Haemoerythrin

  3. Haemoglobin

  4. Haemolysin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Transportation of oxygen in humans is carried out by haemoglobin, which is stored in RBC’s. Haemoerythrin pigment is present in lower organisms while leghaemoglobin is present inside the root nodules of leguminous plants, e.g. pulses. Haemolysin is not a pigment. Thus, option (3) is correct.

Multiple choice

______ carries oxygen.

  1. RBC

  2. WBC

  3. Platelet

  4. Plasma
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

RBC (Red Blood Cells) is correct because red blood cells contain hemoglobin, which binds to oxygen molecules in the lungs and releases them to tissues. WBCs fight disease, platelets help clotting, and plasma is the liquid medium that carries the cells.

Multiple choice

Blood makes up about _______ percent of our body weight.

  1. 10%

  2. 9%

  3. 8%

  4. 12%
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Blood constitutes approximately 8% of total body weight in an average adult. This percentage can vary slightly based on factors like age, sex, and overall health. The other options (9%, 10%, 12%) are not accurate representations of blood's proportion of body weight.

Multiple choice

Which of the following statements is/are correct about hemoglobin?

  1. Each hemoglobin molecule can combine with two O2 molecules.
  2. Each hemoglobin molecule contains two globin units with two heme units.
  3. Deoxy- and oxyhemoglobin have different colours.

  1. Only 1

  2. Only 2

  3. Only 3

  4. Only 1 and 2

  5. Only 2 and 3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Deoxy- and oxyhemoglobin have different colours. This is why the blood in our arteries (oxyhemoglobin) is brighter red than the blood in our veins (deoxyhemoglobin).

Multiple choice

Which of the following substances is transported by blood plasma?

  1. Food

  2. Potassium

  3. Alcohol

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Blood plasma is the liquid component of blood that carries various substances in dissolved form. It transports nutrients like glucose (food), electrolytes like potassium, and exogenous substances like alcohol. Because it serves as the primary medium for transporting all these dissolved materials, 'All of these' is the correct choice.

Multiple choice

Which of the following helps in maximum transport of oxygen?

  1. Red blood corpuscles

  2. Platelets

  3. Plasma

  4. White blood corpuscles.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Red blood corpuscles (RBCs) contain hemoglobin, a protein that binds readily with oxygen molecules. This allows RBCs to transport the vast majority of oxygen from the lungs to the body's tissues.

Multiple choice

Which of the following is responsible for gaseous exchange in the human body?

  1. Temperature difference

  2. Permeability difference

  3. Pressure difference

  4. Solubility difference
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The difference in partial pressures of gases results in diffusion of gases through the respiratory membrane. Diffusion occurs when there is a difference between partial pressures of alveolar air and blood.