The oxygen and carbon dioxide crosses the plasma membrane through the process of _.
Correct answer: C. Passive diffusion
- A. Active diffusion
- B. Facilitated diffusion
- C. Passive diffusion
- D. Random diffusion
Explanation
Passive diffusion is the type of diffusion which takes place down the concentration gradient and there's no need of any Channel protein. Since the concentration of Oxygen entering the alveoli is greater whereas the concentration of oxygen entering the lungs through blood is lower, thus a concentration gradient created and oxygen diffuse from alveoli into the blood through the plasma membrane. Vice versa happens for Carbondioxide. Since, Oxygen and Carbondioxide are small, soluble polar molecules, they can easily cross the plasma membrane via Passive transport, marking this option to be correct.
Last updated
About Cell Structure and Function
Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
Practise Cell Structure and Function
2,478 free Cell Structure and Function 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 6 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.