3.2 Circulatory Systems Flashcards
Single called organisms are able to get everything through what?
Simple diffusion across their membrane
Single celled organisms have what features meaning they can rely on simple diffusion?
Small
Large sa:v
Low metabolic rate
Multicellular organisms have what features:
Large
Small sa:v
High metabolic rate
Active
Multicellular organisms need a transport system for what reasons?
Metabolism Small sa:v Hormones Digestion Waste products
Why do multicellular organisms need a transport system due to metabolism?
High oxygen and glucose demands
Diffusion distance too large to supply these by simple diffusion
Why do multicellular organisms need circulatory systems due to small sa:v?
Makes diffusion distance large
Simple diffusion would be too slow
Why do multicellular organisms need transport systems for hormones?
To take them from where they are made to where needed
Why do multicellular organisms need transport systems for digestion?
To take glucose from digestive system to where needed
Why do multicellular organisms need transport systems due to high metabolic rate?
Lots of waste products that need to be carried away from respiring cells
What are features of all circulatory systems?
Liquid transport medium
Vessels
Pumping mechanism
What is mass transport?
When substances are transported in a mass fluid around the body with a mechanism for moving he fluid
(Single) where are single circulatory systems found?
Fish
(Single) blood passes through the heart how many times for each complete circuit of the body?
Once
(Single) in fish the heart pumps blood to where?
The gills to pick up oxygen
Rest of body to deliver oxygen
(Open) what is a feature of an open circulatory system?
Blood not always enclosed in vessels
