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Unicellular Organisms: Diffusion and Exchange

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Unicellular Organisms: Diffusion and Exchange

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Questions and Answers

What is the function of phagocytes in the immune system?

Release chemicals to inhibit pathogenic microorganisms

Produce antibodies to fight pathogens

Engulf and digest pathogens (correct)

Transport oxygen to respiring cells

Why do red blood cells have no nucleus?

To create more surface area for heat transfer

To make space for transporting hormones

To allow them to release oxygen more efficiently

To maximize the diffusion of oxygen in and out (correct)

What is the role of urea in the body?

Transporting oxygen to respiring cells

Creating heat energy in respiration

Dissolving and being transported to the kidneys (correct)

Acting as a chemical messenger in the blood

How are phagocytes recognized under the microscope?

By their multi-lobed nucleus and granular cytoplasm Signup and view all the answers

What is the main function of white blood cells in the body?

Engulfing and digesting pathogens Signup and view all the answers

What is the main reason unicellular organisms exchange substances using diffusion?

They have very large surface areas and small volumes Signup and view all the answers

Which of the following is NOT an exchange surface in animals?

Roots and root hairs where mineral ions and water are absorbed Signup and view all the answers

What is the composition of red blood cells?

Biconcave discs containing no nucleus but plenty of the protein haemoglobin Signup and view all the answers

What does plasma transport in the blood?

All the blood Signup and view all the answers

Why do large multicellular organisms like humans require transport systems and exchange surfaces?

Because they have small surface areas and large volumes Signup and view all the answers