Starter Questions • What is the difference between circulatory systems between unicellular and multicellular organisms. • How many chambers does the heart have and identify if they have oxygenated or deoxygenated blood. • How is an impulse transmitted across the heart?
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Starter Questions What is the difference between circulatory systems between unicellular and multicellular organisms. How many chambers does the heart.
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Starter Questions
• What is the difference between circulatory systems between unicellular and multicellular organisms.
• How many chambers does the heart have and identify if they have oxygenated or deoxygenated blood.
• How is an impulse transmitted across the heart?
The Circulatory System Introduction
Chapter 37.1
Circulatory System
• Single cells can get nutrients from their environment and get rid of wastes by simple diffusion
• A circulatory system is only needed in larger organisms with multiple cellsBody cells must be bathed in fluid to
transport nutrients and wastes
Types of Circulatory Systems
• Open Circulatory System– No vessels
Blood just floats in the body cavities
• Closed Circulatory System– Blood flows in a system of vessels
Human Circulatory System
The human circulatory system consists of the:
1. heart
2. a series of blood vessels
3. blood
The HeartStructure• Composed of cardiac muscle• Located near the center of your chest• Pericardium: protective sac that encloses the heart• Myocardium
– thick middle muscle layer of the heart– Pumps blood through the c.s.
• Septum – divides the left and right side of the heart– prevents the mixing of oxygen-poor and oxygen-rich
blood
The Heart
Circulation through the body
• Two separate pumps– Pulmonary Circulation
• the right side of the heart pumps blood from the heart to the lungs and back again
• leaves deoxygenated, returns oxygenated
– Systemic Circulation• the left side of the heart pumps blood from the heart
to the body and back again• leaves oxygenated, returns deoxygenated