Circulatory System Chapter 11 Purpose of Circulatory System

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 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 �When around body cells 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, multichambered 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 480 -481, also do question #5 on 481