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Understanding the Physiology of Health and Illness

The animal cell and its organelles

  • 3 things to know
  • AS 7

Overview

Function of the cell membrane, structure of the cell membrane and job of a ribosome.

What you need to know

Answer each one before you reveal it.

Your recallNot started
Key term

What is the function of the cell membrane?

Key term

Describe the structure of the cell membrane.

Key term

What does the nucleus do?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is the function of the cell membrane?

    Model answer

    The cell membrane encloses the cell and controls which substances enter and leave it.

  2. 2

    Describe the structure of the cell membrane.

    Model answer

    The cell membrane is a double layer of phospholipid molecules with proteins embedded in it, an arrangement described as a fluid mosaic.

  3. 3

    What does the nucleus do?

    Model answer

    The nucleus holds the cell's DNA and controls the cell's activities, including protein synthesis and cell division.

  4. 4

    What is the nucleolus and what is it for?

    Model answer

    The nucleolus is a dense region inside the nucleus that makes ribosomes.

  5. 5

    Which organelle releases most of a cell's energy, and how?

    Model answer

    Mitochondria release most of a cell's energy by aerobic respiration, transferring it to ATP.

  6. 6

    Why do muscle cells contain large numbers of mitochondria?

    Model answer

    Muscle cells contract repeatedly and need a great deal of ATP, so they carry large numbers of mitochondria to supply it.

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