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- List the parts and functions of the human circulatory system.
- Describe the anatomy of the heart.
- Discuss the phases of the cardiac cycle.
- Learn the mechanics of the heartbeat.
- Become familiar with the wave types measured by the electrocardiogram (ECG).
- Discuss types of heart arrhythmias and explain how they can be detected by ECGs.
- Explore different heart conditions and diseases.
- Explain how heart rate and stroke volume are regulated.
- Describe how blood flow and blood pressure are regulated.
- Learn about the functions of the lymphatic system.
- Describe the roles of red blood cells and hemoglobin in the circulatory system.
- Discuss the different blood types and antigens.
- Explain the importance of Rh factor.
- Learn the types and causes of anemia.
- Describe the process of wound healing.
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. Electrocardiogram (ECG): Definition & Wave Types
Do you know how problems in the heart are detected? In this lesson, you will learn how to read an electrocardiogram (ECG) and discover what is happening in the heart during the P, QRS, and T waves.
6. Arrhythmia of the Heart: Terms, Definition & ECG Detection
An electrocardiogram, or ECG, can be used to detect irregular heartbeats or arrhythmias. In this lesson, you will learn about arrhythmias detected by ECG, including bradycardia, tachycardia, fibrillation, and heart block.
7. Types of Heart Conditions and Diseases
Your heart muscle receives a rich blood supply from the coronary arteries. If the coronary arteries become blocked, it can result in coronary heart disease, angina, heart attack or congestive heart failure. Learn how these conditions get started.
8. 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.
9. 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.
10. 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.
11. 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.
12. Functions of the Lymphatic System
In this lesson, you will learn about the lymphatic system and the vital role it plays in keeping the cardiovascular system working. You'll discover how the lymphatic system (with its lymphatic vessels and capillaries) quietly works in the background to return leaked fluids back to the blood.
13. 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.
14. 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)!
15. 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.
16. 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.
17. Anemia: Types and Causes
Your red blood cells have a unique design that differentiates them from all other cells. This unique design makes them exceptional oxygen carriers. But if this ability to carry oxygen is compromised, the result is a form of anemia, such as pernicious anemia, aplastic anemia or sickle cell anemia.
18. 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.
19. Three-Chambered Heart: Definition & Anatomy
Our own beating hearts have four separate chambers, while those of frogs, toads, snakes and lizards get by with only three. Learn about the functionality of the 3-chambered heart while comparing it to your own in this lesson.
20. Atrium: Heart Function & Definition
The atrium is a key player in the functioning of the heart, yet it does not get the attention it's due when compared to the ventricles. This lesson pays homage to this unsung hero in cardiac circulation.
21. Diastole: Definition & Importance
We are going to discuss what diastole means and when it occurs. You will learn about the importance of diastole. There will be a quiz to check your understanding after the lesson.
22. Lymphatic Vessels: Definition & Function
In this lesson, you will learn what lymphatic vessels are and why they are important for fluid management, immune function, and fat absorption. You'll then take a short quiz to test your knowledge.
23. Pericardium: Definition & Function
Did you know that your heart is surrounded by something called the pericardium? Learn all about the pericardium, including where it is located and how it functions in the body. Then take a quiz to check how well you understand the information.
24. Pulmonary Circuit: Definition & Pathway
The pulmonary circuit is the path deoxygenated blood takes through the heart to the lungs. This lesson explains the reason for the journey and outlines the path through the pulmonary circuit.
25. Vascular Cambium: Function & Definition
A plant's ability to undergo growth is dependent upon the cell division that occurs within its stems, roots, and leaves. Vascular cambium has a major role in this growth. Here we will investigate the definition of vascular cambium and look at its function.
26. What is Atherosclerosis? - Definition, Symptoms & Treatment
Atherosclerosis is a disease that is silent, but often deadly, since it can cause you to suddenly have a heart attack or stroke. In this lesson, we will learn how atherosclerosis develops and what you can do to prevent it.
27. Aortic Semilunar Valve: Definition & Function
This lesson is about the aortic semilunar valve in the heart. We'll explain what the semilunar valve is, how it keeps us alive, and what happens to people with a defective semilunar valve.
28. Hypertensive Crisis: Causes, Symptoms & Treatment
Did you know that there are two types of hypertensive crises? Learn more about hypertensive crisis, its causes, symptoms, and treatment. Then test your knowledge with a quiz.
29. Blood Type Genetics
In this lesson you'll gain an overview of blood type genetics. Find out how you inherit your blood type and explore what the different blood types mean.
30. Blood Type Inheritance in Humans
This lesson explains differences among the four blood types in humans: A, B, AB, and O. It also shows how these blood types are passed from parents to children.
31. What are Genetic Blood Disorders?
Have you ever heard of a genetic disorder? What about a genetic blood disorder? In this lesson you will learn what causes genetic blood disorders as well the names of the most commonly occurring ones.
32. Genotypes for Various Blood Types
What are the primary human blood types and how is each determined? This lesson helps answer those questions through an investigation into genotypes and their relationship to blood type.
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