Topic 1 - Exchange And Transport Flashcards
Where does exchange of substances occur
On moist permeable surfaces
What is the volume of an organism
The total 3D space occupied by metabolically active tissues
What is the surface area of an organism
The total number of cells in direct contact with the surrounding environment
What is the relationship between size and SA-to-volume ratio
The larger the organism, the smaller the ratio
What is mass flow
The diffusion of larger organisms
What are examples of mass flow systems
Xylem
Phloem
Breathing
Blood circulation
How does xylem generate pressure
Transpiration all loss of water from the leaves
How does phloem generate pressure
Energy from the plant
How does breathing generate pressure
Pressures in the thorax can be increased and decreased
How does blood circulation generate pressure
The heart
What is diffusion
The movement of molecules from an area of high concentration to an area of low concentration
