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Dec 18, 2016 · This section of the AP Biology curriculum focuses on cell size and shape. More specifically, it looks at how the surface-area-to-volume ratio of a cell helps determine how efficient that cell is at exchanging macromolecules with the external environment.
Elastic fibres: Fibres of elastin that allow the alveoli to stretch as air is drawn in and recoil back to normal size, expelling air. They are also found in the trachea, bronchi and bronchioles. Exchange surface: A surface over which materials are exchanged from one region to another.
The size of their surface, or surface area, defines how quickly they can absorb substances. The size of their volume defines how much of these substances they need.
explain how surface area, number of channel or carrier proteins and differences in gradients of concentration or water potential affect the rate of movement across cell membranes.
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Dec 18, 2016 · In this section of the AP Biology curriculum, we start to look at how cell membranes operate to maintain solute and water balance, and how they deal with importing and exporting biological macromolecules. Cells do this mainly through two methods: passive transport and active transport.
Dec 18, 2016 · This is section 2.9 of the AP Biology curriculum. We will start with a quick review of active transport, passive transport, endocytosis, and exocytosis. Then, we’ll see how it takes many different mechanisms of transport to complete the process of creating chemical energy in the form of ATP.
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What is membrane transport in AP Biology?
What are the different mechanisms of transport in AP Biology?
What is cell size and shape in AP Biology?
How does surface area affect the rate of movement across cell membranes?
What is the difference between surface area and volume?
How does surface area affect the rate of diffusion?
Surface area and thickness of the plasma membrane: Increased surface area increases the rate of diffusion, whereas a thicker membrane reduces it. Distance travelled: The greater the distance that a substance must travel, the slower the rate of diffusion.
