Absorption Of Materials Flashcards
What needs to be absorbed into the bloodstream and why?
Oxygen and nutrients from food need to be absorbed into the bloodstream to be delivered to cell for respiration
What is a waste material that needs to be removed from the cells into the bloodstream?
Carbon Dioxide
What is a capillaries function?
To allow the exchange of materials at a cellular level
What are the features that surfaces involved in absorption of materials share? What is their purpose?
They all have: A large surface area Thin walls An extensive blood supply They increase the efficiency of absorption
What is an example of a gas exchange organ?
The lungs
What makes the Lungs good gas exchange organs?
They have a large number of alveoli giving a bigger surface area for gas exchange
What’s substances are absorbed through the alveoli? Where do they come from and where do they go?
Oxygen and Carbon dioxide are absorbed through the THIN alveolar walls to OR from the many blood capillaries in the body
Where are nutrients absorbed in the body?
They are absorbed through the villi in the SMALL intestine
The large number of thin walled villi provide a large surface area for absorption of materials
What does each villus have?
A network of CAPILLARIES to absorb glucose and amino acids and a LACTEAL to absorbs fatty acids and glycerol
Describe the structure of the villus
The surface layer - The Epithelial Cells
The Capillaries (The cage thing)
The lacteal
The blood vessel (at the bottom the end things)
Definition of Digestion
The breakdown of LARGE, INSOLUBLE molecules to SMALL, SOLUBLE molecules that can be absorbed through the small intestine into the bloodstream
Why is thin lining important to the lungs for effecient gas exchange
the lining of the alveoli is very thin so that gases can quickly diffuse through it.
Whyis good blood supply important to the lungs for effecient gas exchange
the alveoli have a dense capillary network so that large volumes of gases can be exchanged.
Why is large surface area important to the lungs for effecient gas exchange
So that theres more area in which gas can diffuse
Where does gas exchange happen?
In the alveoli
