UH BIOL 1344 - Layers of the Heart (2 pages)
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Layers of the Heart
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Describes some anatomy of the heart including layers, valves, and cardiac muscles.
- Lecture number:
- 5
- Pages:
- 2
- Type:
- Lecture Note
- School:
- University of Houston
- Course:
- Biol 1344 - Hum Anat Physiol
- Edition:
- 1
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Unformatted text preview:
BIOl 1344 Lecture 5 Outline of Last Lecture I Determining blood type II Blood Clotting Factors III Stages of Blood Clotting A Intrinsic and Extrinsic pathways B Intravascular clotting IV Characteristics of the Heart V Blood flow through the Heart Outline of Current Lecture VI Layers of the Heart VII Valves in the Heart and Conditions with Malfunctioning Valves VIII Coronary Arteries and Blood Pressure IX Cardiac Muscle Cells Current Lecture Layers of the heart The epicardium is the visceral pericardium Next comes the myocardium which is the muscular layer This layer is responsible for muscular contraction and creating the force needed to pump blood out of the heart The innermost layer is the endocardium also known as the endothelium which is a single layer of cells The valves in the heart can become incompetent which mean that they do not properly close This can cause back flow into the heart or regurgitation Valvular stenosis is a condition in which the valve opening is too narrow and more force is needed to pump blood through the opening This causes this heart to become enlarged from working so hard and can result in a pain chest tightness or even a stroke Aortic insufficiency is a condition in which the aortic valve is not working correctly and blood can flow back into the heart This results in less blood going out to the body causing shortness of breath in the sufferer because the body is not receiving sufficient oxygen These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute There are four valves in the human heart They are made of fibrous collagen tissues and are non conducting non contractile and they electrically isolate 1 2 3 4 Aortic Valve Tricuspid Valve Bicuspid Valve Pulmonary Semilunar Valve The coronary arteries supply the heart with the blood They move about 5 Liters of blood minute or about 70 mL per beat with 70 beats minutes The anterior
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