Biology

Respiration and Gas Transport

606 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

______ 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

The basic life process that obtains energy from food for the proper functioning of the body is _____.

  1. respiratory system

  2. digestive system

  3. circulatory system

  4. skeletal system
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The digestive system breaks down food into nutrients like glucose that provide energy for body functions. While the respiratory system exchanges gases, the circulatory system transports substances, and the skeletal system provides structure, only the digestive system directly obtains energy from food.

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.

Multiple choice

Directions: Read the following information and answer the given question.

Seema’s mother was working in the kitchen. Seema came inside and started cutting vegetables with a sharp knife. Her mother stopped her from using a knife but she dint agreed. Suddenly she got a cut on her finger and it started bleeding. After 2 or 3 minutes the bleeding stopped.

Which of the following is not a constituent of blood?

  1. Red blood cells

  2. White blood cells

  3. Platelets

  4. Gastric juice
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Gastric juice is not a constituent of blood.

Multiple choice

RBCs have the quality to change themselves according to the surrounding conditions. When a person ascends to high altitudes, what changes occur in red blood cells?

  1. Increase in size

  2. Increase in number

  3. Decrease in size

  4. Decrease in number

  5. -
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

At high altitude, RBCs of human blood increase in number to accommodate larger amount of haemoglobin for the increased uptake of oxygen, which is present in lesser amounts at higher altitudes.

Multiple choice

Carbon monoxide is usually found in lesser amounts and is more harmful than carbon dioxide because

  1. it reacts more quickly with UV rays

  2. it has more affinity for haemoglobin

  3. it has lesser affinity for haemoglobin

  4. it cannot compete with oxygen

  5. -
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbon monoxide is more harmful than carbon dioxide as it combines more readily with haemoglobin than carbon dioxide. Hence, it does not allow oxygen to combine with haemoglobin.

Multiple choice

Which of the following statements is incorrect?

  1. Plasma transports food, carbon dioxide and nitrogenous waste.

  2. Red blood cells transport oxygen.

  3. Plasma is a fluid medium that transports salts.

  4. WBCs help in clotting of blood.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

WBCs help protect the body from infection and kill harmful microbes. Platelets help in clotting the blood, so as to prevent the body from excess loss of blood during an injury.