Cardiovascular System

Cardiovascular System - Cardiovascular System Blood role...

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Cardiovascular System 2/12/09 1 Cardiovascular System Blood – role / components / problems Vessels – types / functions / problems Nutrient exchange at the capillaries Lymphatic System Body Defense System Heart – simple construction / built for endurance 4 chambers / 4 valves / 2 pumps / variable output / innate beat / coronary circulation Heart attacks and other anomalies Atherosclerosis = plaque build up in arteries Lifestyle problem. Contributing factors Cardiovascular Control Center (CVCC) – medulla monitors blood [CO 2 ] and blood pressure Cerebral Circulation = most tightly controlled Strokes(CVAs)= compromised brain circulation Hypertension:US:20% have by 60yrs; 90% ca. uk Cholesterol:Understanding is Key. 23 min.video
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Cardiovascular System 2/12/09 2 Whole Blood Composition Blood Plasma – 55% 92% water 1% salts, nutrients, wastes, etc. 7% proteins Osmotic pressure regulators - albumins (5%) Antibodies - globulins (1%) Clotting proteins - fibrinogen (1%) Blood Cells – 45% (% Hematocrit) 95% RBC O 2 /CO 2 transport 0.1% WBC Body defense mechanisms 5% Platelets Clotting/vasoconstriction Lymph Plasma minus proteins Serum Plasma minus clotting proteins
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Cardiovascular System 2/12/09 3 Lymphoid Tissues (Blood Cell Origin; see BDS also) Lymph nodes (glands) Bone marrow Liver Spleen Adenoids Tonsils Thymus gland
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Cardiovascular System 2/12/09 4 Blood Vessels Arteries carry high-pressure blood away from the heart. Their thick, muscular and strong connective tissue-lined walls contain this blood and smooth out its pulsating flow. They are protected by being deep within our body tissues. They undergo only slight changes in diameter. Arterioles receive the blood from the smallest arteries and direct it into the capillaries. They have no connective-tissue lining but significant musculature, allowing them to change diameters by a factor of 5 times. They, thus, act as valves for blood entry into the capillaries, by allowing
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This note was uploaded on 05/05/2009 for the course EBIO 1040 taught by Professor Didomenico during the Spring '08 term at Colorado.

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Cardiovascular System - Cardiovascular System Blood role...

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