3.1.2 Circulatory Systems Flashcards
What do cells of all living organisms need for metabolism?
A constant supply of reactants such as oxygen and glucose
How do single-celled organisms gain oxygen and glucose?
Directly across their surface membranes
What is the reason larger organisms cannot rely solely on diffusion for reactants?
The diffusion distances involved are too great
What is the function of exchange surfaces in larger organisms?
To connect to a mass transport system for efficient reactant supply
Which systems are connected to the digestive system for transport?
The circulatory system
What do circulatory systems transport?
Fluids containing oxygen, nutrients, and waste
What is a single circulatory system?
A system where blood passes through the heart once during one complete circuit of the body
What is a double circulatory system?
A system where blood passes through the heart twice during one complete circuit of the body
Which type of circulatory system do fish have?
Single circulatory system
Which type of circulatory system do mammals have?
Double circulatory system
What is deoxygenated blood’s path from the heart?
Deoxygenated blood is pumped to the gills from the heart.
What happens at the gills?
The gills are the exchange site where oxygen and carbon dioxide are exchanged with the atmosphere and the blood.
Where does oxygenated blood flow after the gills?
The oxygenated blood flows from the gills to the rest of the body.
What does blood do in the capillaries of organs?
It travels through the capillaries in organs, delivering oxygen and nutrients.
What happens to blood after it delivers oxygen and nutrients?
The blood returns to the heart.
What is unique about the heart’s structure?
The heart only has one atrium and one ventricle.
