Amount of O2 carried by red blood cells is:
Correct answer: D. 97%
- A. 77%
- B. 90%
- C. 87%
- D. 97%
Explanation
Red blood cells (also known as erythrocytes) contain a protein called hemoglobin, which carries oxygen from the lungs to all parts of the body. Haemoglobin is an iron-containing protein that is found within all RBCs. Haemoglobin is made of four subunits: two alpha subunits and two beta subunits. Each subunit surrounds a central heme group that contains iron and binds one oxygen molecule, allowing each hemoglobin molecule to bind four oxygen molecules, forming oxyhemoglobin. Approximately, 97% of oxygen is carried by the red blood cells as oxyhemoglobin, while 3% is transported as dissolved oxygen in the plasma.
Last updated
About Human Respiratory System
The human respiratory system conducts air to the alveoli, where oxygen and carbon dioxide exchange occurs across thin respiratory surfaces. Questions cover the nasal passage, trachea, bronchi, lungs, diaphragm and intercostal muscles, ventilation mechanics and gas transport, while distinguishing breathing and gaseous exchange from cellular respiration.
Practise Respiration
446 free Respiration MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A complex cartilaginous structure surrounding the upper end of the trachea is called:
A condition in which there is a decrease of oxygen to the tissue despite adequate blood flow to the tissue is_________?
A series of C shaped cartilage rings are found in the wall of:
A surfactant is a secretory product that is composed of:
All of the following contain cartilage except:___________?