Lecture Outline for April 11, 2005


Topic: transport in animals circulatory systems

Chapter 35 sections 35.1, 35.2

Figures used in lecture: 35.1, 35.2, 35.3, 35.5, 35.8,

Additional Resources

The Circulatory System this page includes some figures I used in lecture


Transport in Animals

Define/explain: gastrovascular cavity, open circulatory system, closed circulatory systems, pulmonary circulation, systemic circulation, arteries, capillaries, veins,


You should be able to:

1. Describe transport through an animal with:

(a) no circulatory system

(b) open circulatory system

(c) closed circulatory system

2. Describe the differences between open and closed circulatory systems including the advantages of a closed system.

3. Define the difference between pulmonary circulation and systemic circulation and describe the path of blood flow through each.

4. Label the anatomy of a mammalian heart and describe the path of blood flow through the heart.



3 types of circulatory systems in animals:

1. No circulatory system


gastrovascular cavity:



2. Open circulatory system



3. Closed circulatory system




Closed circulatory systems in vertebrates:

a) 2-chambered heart fish

one atrium, one ventricle

b) 3-chambered heart amphibians and reptiles

2 atria, one ventricle

c) 4-chambered heart - birds and mammals

2 atria, 2 ventricles

allows for separation of pulmonary circulation and systemic circulation



Pulmonary circulation :



Oxygenated blood :



Deoxygenated blood:









Capillaries :



Circulation through the heart


Superior/Inferior vena cava right atrium atrioventricular (tricuspid) valve right ventricle pulmonary valve

pulmonary arteries lungs Pulmonary veins left atrium atrioventricular (biscuspid) valve left ventricle

aortic valve aorta