Questions and Answers
Distinguish between phagocytosis and pinocytosis.
Phagocytosis is 'cell-eating' involving engulfing solid material, while pinocytosis is 'cell-drinking' involving taking up excess liquid.
Give an example of phagocytosis and identify the cell type involved.
An example is in feeding in amoeba, neutrophils, and macrophages that engulf foreign material. They are white blood cells.
Describe an example of exocytosis and identify the cell type involved.
Exocytosis involves secretory cells.
Explain why cytosis is affected by changes in oxygen level, whereas diffusion is not.
Signup and view all the answers
Identify the processes by which the following substances enter a living macrophage: a) Oxygen: _ b) Cellular debris: _ c) Water: _ d) Glucose: _
Signup and view all the answers
Study Notes
Phagocytosis vs. Pinocytosis
- Phagocytosis, known as 'cell-eating,' involves engulfing solid particles to form large vesicles or vacuoles.
- Pinocytosis, termed 'cell-drinking,' involves the uptake of non-specific liquids or fine suspensions, resulting in small pinocytic vesicles.
- Pinocytosis occurs continuously in response to cellular needs for liquid.
Example of Phagocytosis
- Amoeba, neutrophils, and macrophages perform phagocytosis by engulfing foreign materials and cellular debris.
- Neutrophils and macrophages are types of white blood cells essential for immune response through phagocytosis.
Example of Exocytosis
- Exocytosis is a process where secretory cells export materials, typically involving the fusion of vesicles with the plasma membrane to release contents outside the cell.
Impact of Oxygen Levels on Cytosis vs. Diffusion
- Cytosis is sensitive to changes in oxygen levels due to metabolic demands and energy requirements for vesicle formation and transport, unlike diffusion, which relies solely on concentration gradients and is passive.
Substances Entering a Macrophage
- Oxygen enters a macrophage through simple diffusion.
- Cellular debris enters via phagocytosis.
- Water is absorbed through osmosis and pinocytosis.
- Glucose enters primarily through facilitated diffusion via specific transport proteins.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
This quiz focuses on the concepts of phagocytosis and pinocytosis as discussed in the MW Miller Plus textbook. It highlights the differences between these two forms of endocytosis, their definitions, and their functions in cellular processes. Test your understanding of these fundamental biological mechanisms!
