About This Chapter
Circulatory System Overview - Chapter Summary
During this chapter, you will learn about the functions of the human circulatory system and the anatomies of its constituent parts. The importance of the circulatory system to medical science needs no introduction, but the large scale of this chapter underscores the complexity of the subject matter. The instructors take that complicated system and break it down into several bite-sized chunks to help with absorption. These video lessons educate you in the following concepts:
- The parts and functions of the human circulatory system
- Anatomy of the heart
- Heartbeat and contraction coordination, heart rate, blood pressure and flow, and stroke volume along with systems for regulating each
- Types of blood vessels and blood flow
- Blood components: Red blood cells and hemoglobin, white blood cells, platelets, and coagulants as well as wound healing
- Rh blood group and Rh factor
- Erythroblastosis fetalis
- Blood types, blood groups, and antigens
- Major blood vessels and capillary beds
It's a lot, right? Our expert instructors tackle the circulatory system with ease in this series of fun and informative videos. You will get both in-depth instruction and real-life application to ensure maximum retention of key concepts. In addition to our short, easy-to-comprehend video lessons, we provide supplementary quizzes that offer immediate feedback and help you determine your strengths and weaknesses. After you finish our self-assessment quizzes, feel free to return to trouble areas in the lessons to catch the parts you may have missed.
1. The Human Circulatory System: Parts and Functions
In this lesson, you will take a ride on the transportation system of the body called the circulatory system and its two parts: the pulmonary circuit and the systemic circuit. Take a look inside and see how every inch of your body receives the oxygen and nutrients it needs.
2. Anatomy of the Heart: Blood Flow and Parts
In this lesson, you will take a look inside the heart and identify the chambers and one-way valves that make up this vital organ. You will also follow along as we trace the flow of blood through the heart chambers.
3. The Cardiac Cycle: Phases, Explanation & Terms
In this lesson, you will learn what happens during each heartbeat, or cardiac cycle. You will also learn that the heartbeat involves periods of relaxation and contraction, known as diastole and systole, respectively.
4. Heartbeat and Heart Contraction Coordination
In this lesson you will learn about your heart's very own regulatory system, the intrinsic conduction system, and how it sets the pace for a normal, healthy heartbeat. You will discover that your heart moves to its own beat thanks to the natural pacemaker of the heart called the SA node.
5. Heart Rate, Cardiac Output & Stroke Volume
The amount of blood your heart pumps is constantly changing to meet the needs of your body. In this lesson, you will learn how the heart maintains an adequate cardiac output, heart rate and stroke volume.
6. Regulation of Heart Rate and Stroke Volume
The amount of blood being pumped through your body changes constantly due to the demands of daily life. In this lesson, you will learn how your body adjusts the heart rate and stroke volume to increase or decrease blood flow.
7. Regulation of Blood Pressure: Short Term Regulation & Baroreceptors
Blood pressure in your blood vessels is closely monitored by baroreceptors; they send messages to the cardio regulatory center of your medulla oblongata to regulate your blood pressure minute-by-minute. In this lesson, you will learn how baroreceptors regulate your short-term blood pressure.
8. Total Peripheral Resistance & Blood Flow Regulation
Blood flows continually through your heart and blood vessels. As the needs of the body change, blood flow needs to increase or decrease. Learn how vasodilation, vasoconstriction and other factors change the amount of resistance within your blood vessels to change blood flow through your body.
9. Blood Vessels: Arteries, Capillaries & More
In this lesson, you will take a trip around the circulatory system and encounter the various blood vessels, including arteries, veins, and capillaries. Come along as we follow the path to every cell of your body.
10. Capillary Beds: Definition & Functions
Nutrients and gases needed by your body cells are transported through your cardiovascular system. But in order for those materials to feed your cells, they must leak out of the system through the capillary beds. Learn how capillary beds work.
11. Blood Vessel Layers: Tunica Intima, Tunica Media & Tunica Adventitia
In this lesson, you will take a microscopic look at the three layers, or tunics, that make up your blood vessels. Follow along and learn how the different cells within these tunics help the vessels contract and relax as blood moves through your circulatory system.
12. Major Blood Vessels Between the Heart and Lungs: Pulmonary Trunk, Arteries & Veins
In this lesson you will learn about the main blood vessels that travel between the heart and lungs. You will also discover that these arteries and veins follow a somewhat unusual pattern.
13. Major Blood Vessels That Carry Blood Away From the Heart
Do you know which arteries are typically blocked during a heart attack? In this lesson, you will learn about the major blood vessels that feed the heart, brain and upper body. Then, find out what causes the pain known as angina.
14. Major Blood Vessels: Descending Aorta - Thoracic and Abdominal Aorta
The aorta is the largest artery of your body, and it is a strong and sturdy vessel. In this lesson, you will learn about its downward path through the chest and abdomen and discover the organs and structures supplied by its branches.
15. Major Blood Vessels Leading to the Heart: Superior Vena Cava, Inferior Vena Cava & Coronary Sinus
In this lesson, you will learn about the main blood vessel that returns blood to the heart called the Venae Cavae. You'll also learn about its two sections: the Superior and Inferior Vena Cava. You will then discover the special drainage system for the heart called the Coronary Sinus.
16. Functions of Red Blood Cells, White Blood Cells & Platelets
Blood is a connective tissue vital to our body's survival. In this lesson, we will explore the three functions of blood by delving into red blood cells, white blood cells and platelets - the three individual components that make up blood as a whole.
17. Circulatory System IV: Red Blood Cells
Why don't mature red blood cells have nuclei or mitochondria, and how do these guys squeeze through capillaries? While learning about the brief but glorious lives of red blood cells, you'll also see which characteristics help them transport oxygen and carbon dioxide to other cells.
18. Circulatory System V: Hemoglobin
Did you ever wonder how red blood cells can store enough oxygen to supply the entire human body? Join us in this lesson on hemoglobin to learn why red blood cells are so good at transporting oxygen and carbon dioxide. This lesson will make you see red (as well as blue and purple-maroon)!
19. Blood Coagulation and Wound Healing
When your blood vessels suffer damage, your body follows a sequence of events to promote blood clotting. In this lesson, you will learn about coagulation cascade and important clotting factors involved in wound healing.
20. Rh Blood Group, Rh Factor & Erythroblastosis Fetalis
Rh factor is a red blood cell antigen found in most people. Those with Rh factor are Rh positive, while those without are Rh negative. In this lesson you will learn about Rh blood compatibility and its importance during pregnancy.
21. Blood Types: ABO System, Red Blood Cell Antigens & Blood Groups
You are either blood type A, B, AB or O. But, did you know that your blood type is determined by microscopic antigens found on your red blood cells? In this lesson, you will learn about the different blood groups and why they do not mix.
22. What Is the Composition of Blood?
This lesson is going to cover the materials of which blood is composed. We will explore the parts that make up the solid and liquid portions of blood and discuss how these are maintained.
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