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1.4 Membrane transport

IB Syllabus Statements

Understandings:

  • Particles move across membranes by simple diffusion, facilitated diffusion, osmosis and active transport.

  • The fluidity of membranes allows materials to be taken into cells by endocytosis or released by exocytosis. Vesicles move materials within cells.

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Applications and skills:

  • Application: Structure and function of sodium–potassium pumps for active transport and potassium channels for facilitated diffusion in axons.

  • Application: Tissues or organs to be used in medical procedures must be bathed in a solution with the same osmolarity as the cytoplasm to prevent osmosis.

  • Skill: Estimation of osmolarity in tissues by bathing samples in hypotonic and hypertonic solutions. (Practical 2)

Video

Transport Across Membranes

Measuring Osmolarity

Structure and Function of Potassium Channel

Osmosis

Membrane Proteins and Functions

Structure of Sodium-Potassium Pump

Flashcards

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Topic 1.4 Membrane transport HookED SOLO Hexagons

  • Explain how particles move across membranes. Discuss simple diffusion, facilitated diffusion, osmosis and active transport.

  • Explain how the fluidity of membranes allows for endocytosis and exocytosis.

  • Compare endocytosis and exocytosis.

  • Explain the structure and function of sodium-potassium pumps for active transport.

  • Explain the structure and function of potassium channels for facilitated diffusion in axons of neurons.

  • Explain why tissues and organs to be used for medical procedures must be bathed in a solution with the same osmolarity as the cytoplasm.

  • Explain how you could determine the osmolarity of of tissues (e.g. potato sample) using hypotonic and hypertonic solutions.

  • Outline why it is important to take accurate mass and volume measurements in science experiments.

  • Explain the difference between accuracy and precision in science experiments.

Quizlet yourself!

Topic 1.4 Membrane transport SSaQ (Syllabus Statement as Questions)

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