Lecture Slides-Cardiovascular System

Lecture Slides-Cardiovascular System - Theme: Cell, Tissue...

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Unformatted text preview: Theme: Cell, Tissue and Organ Functions are Regulated by Control Systems through Negative and Positive Feedback Mechanisms • Concept A: Maintenance of a constant internal environment (homeostasis) is necessary for the optimal functioning of physiological processes and requires energy-dependent steady state conditions. oncept B: Feedback mechanisms allow organisms • Concept B: Feedback mechanisms allow organisms to self-regulate and maintain homeostasis. • Concept C: Negative feedback loops are stabilized when input response times are faster than output response times. heme: Life is Characterized by Theme: Life is Characterized by a High Level of Order and Complexity • Concept A: Biological order and complexity is instructed; they are derived from the information content of DNA • Concept B: Biological systems exhibit emergent properties heme: Biological Structure Theme: Biological Structure and Function are Coupled • Concept A: Structure optimizes physiological processes. • Concept B: Specialized structures (e.g., eye, voice box) support specialized functions • Concept C: Diseases are aberrations of normal structure and/or function unctions of the Functions of the Cardiovascular System • transport nutrients, respiratory gases • immunity, tissue injury, infection • transport waste • ansport regulatory chemicals (hormones) transport regulatory chemicals (hormones) • temperature regulation eart Facts Heart Facts • In one day the heart pumps about 4,000 gallons of blood. • Blood circulates through 100,000 miles of arteries, veins, and capillaries. he heart beats an average of 70 times in one minute or over • The heart beats an average of 70 times in one minute or over 100,000 times a day. This work is equivalent to lifting 100 tons in the air. • Heart rate is related to body size. The canary has a heart rate of 1000 beats per minute. The new born human has a heart rate of 130 beats per minute and the adult human has a heart rate of 70 beats per minute • he heart gets short rests between beats. When beating at the The heart gets short rests between beats. When beating at the rate of 70 beats per minute, the ventricles are contracted 0.3 seconds and relaxed 0.5 seconds. The atria contract of 0.1 seconds and relax for 0.7 seconds. chematic of the Heart Schematic of the Heart Pulmonary vein (from lungs) Vena cava (from body) t i t i R atrium L atrium AV valve AV valve R ventricle L ventricle Aorta (to body) Pulmonary artery (to lungs) SL valve SL valve Oxygen-poor blood Oxygen-rich blood natomy of the Heart Anatomy of the Heart • Pericardium (outside heart)-protects heart • Myocardium (heart muscle) – heart muscle responsible for pumping lood blood – connective tissue for support and nerve conduction • Endocardium (lining of heart chambers) – smooth surface minimizes blood turbulence during pumping figure 49-04b.jpg 49.4 ardiac Valves Cardiac Valves • 4 valves control blood flow in the heart ortic valve •...
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This note was uploaded on 10/25/2010 for the course BIO 188 taught by Professor Capco during the Spring '08 term at ASU.

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Lecture Slides-Cardiovascular System - Theme: Cell, Tissue...

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