10 Questions
What is the function of phagocytes in the immune system?
Engulf and digest pathogens
Why do red blood cells have no nucleus?
To maximize the diffusion of oxygen in and out
What is the role of urea in the body?
Dissolving and being transported to the kidneys
How are phagocytes recognized under the microscope?
By their multi-lobed nucleus and granular cytoplasm
What is the main function of white blood cells in the body?
Engulfing and digesting pathogens
What is the main reason unicellular organisms exchange substances using diffusion?
They have very large surface areas and small volumes
Which of the following is NOT an exchange surface in animals?
Roots and root hairs where mineral ions and water are absorbed
What is the composition of red blood cells?
Biconcave discs containing no nucleus but plenty of the protein haemoglobin
What does plasma transport in the blood?
All the blood
Why do large multicellular organisms like humans require transport systems and exchange surfaces?
Because they have small surface areas and large volumes
Learn about how unicellular organisms exchange substances such as food molecules and waste products using diffusion. Understand the relationship between surface area, volume, and the efficiency of diffusion in unicellular organisms.
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