Circulatory System Chapter 11

Purpose of Circulatory System Required by complex organisms to: ◦ Transport _______ and _________ to all the cells ◦ Carry away waste products ◦ Move chemical signals (_________) throughout the body ◦ Distribute ________ energy throughout the body

Features of Systems What are the three required features of a circulatory system? ◦ ◦ ◦

Open circulatory system Found in many crustaceans, insects and snails A heart contracts and pumps fluid through a series of vessels and is then pumped out into body cavities Flows around body cells When heart relaxes fluid is sucked back into the heart and vessels

Open circulatory system Hemolymph ◦ Hem-, hemo-, and hemato- ◦ Circulating fluid ◦ Combination of blood and tissue fluid

Closed Circulatory System Heart pumps fluid through the body Often a complex, multi- chambered organ ◦ ________: chamber that receives fluid from body ◦ _________: chamber that pumps blood to the body

Closed Circulatory System Heart pumps fluid through a series of tubes Fluid never leaves the vessels Exchange of materials from circulatory fluid to body cells occur by _____________ across thin membranes

Closed Circulatory System DO NOW questions: ◦ What is a single-circuit system? ◦ What is a two-circuit system? ◦ Draw out a diagram of each of these with proper labels. ◦ Check page , also do question #5 on 481