Overview
This lecture outlines the circulatory system, focusing on its structure, function, and role in transporting blood throughout the body.
Circulatory System Basics
- The circulatory system is responsible for transporting blood, nutrients, oxygen, carbon dioxide, and hormones throughout the body.
- It consists of the heart, blood vessels (arteries, veins, capillaries), and blood.
- The heart pumps blood and maintains blood circulation across the body.
Blood Vessels and Blood Flow
- Arteries carry oxygenated blood away from the heart to body tissues.
- Veins return deoxygenated blood back to the heart.
- Capillaries are small vessels where exchange of gases, nutrients, and waste occurs between blood and tissues.
Circulation Types
- Systemic circulation moves oxygenated blood from the heart to the body and returns deoxygenated blood to the heart.
- Pulmonary circulation transports deoxygenated blood from the heart to the lungs for oxygenation and back to the heart.
Key Functions
- Delivers oxygen and nutrients to cells.
- Removes carbon dioxide and metabolic waste from cells.
- Helps regulate body temperature and maintain homeostasis.
Key Terms & Definitions
- Circulatory System — transports blood, nutrients, gases, and waste in the body.
- Arteries — blood vessels carrying blood away from the heart.
- Veins — blood vessels returning blood to the heart.
- Capillaries — tiny vessels for exchange of substances between blood and tissues.
- Systemic Circulation — blood flow between heart and body.
- Pulmonary Circulation — blood flow between heart and lungs.
Action Items / Next Steps
- Review heart anatomy and the cardiac cycle in upcoming lessons.
- Complete the Cardiovascular System Quiz after finishing all related lessons.