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The Circulatory System

The Circulatory System. May 18, 2012 pgs. 151-152. Know. What do you know about the circulatory System? . “I don’t know anything.” is not an acceptable answer. Use complete sentences. Evidence: Drawings pg 539 and 541 textbook– draw, label and color. Circulatory System. Functions.

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The Circulatory System

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  1. The Circulatory System May 18, 2012pgs. 151-152

  2. Know What do you know about the circulatory System? “I don’t know anything.” is not an acceptable answer. Use complete sentences. Evidence: Drawings pg 539 and 541 textbook– draw, label and color

  3. Circulatory System Functions Information Clarifying ?s 1. Transports/delivers necessary materials to muscles and organs Ex: Vitamins, minerals, nutrients, oxygen 2. Eliminates waste Ex: carbon dioxide, ammonia, lactic acid 3. Carries red/white blood cells through body; White blood cells help fight infections and red blood cells store oxygen. The heart Hollow organ made mostly of muscle that pumps blood through the body. About the size of your fist. Blood flows only go one direction through heart. Heart Structure Has four hollow cavities– chambers-- divided into the two upper chambers--atria and two lower chambers-- ventricles. They are divided into left and right sides. Two sides are not connected; separated by a wall of muscle. The ventricles are connected by passageways to the atria. passageways blocked by one way valves, which allow blood to only flow from the atria to the ventricles.

  4. Circulatory System How the heart works Information Clarifying ?s FYI: Warm blooded vertebrates (Birds/mammals) have four chambered hearts. Cold blooded vertebrates (except crocodilians) have three chambered hearts. Heart and circulatory system is a closed repeating pathway, Phase 1:. Right ventricle pumps oxygen depleted blood to lungs. Left ventricle pumps oxygen enriched blood to head and body. Phase 2: Right atrium receives oxygen depleted blood from head and body. Left atrium receives oxygen enriched blood from lungs. Then it all starts over again, and again, and again, and again …….

  5. Circulatory System Information Clarifying ?s - regulates the heart beating . Placed in the right atrium, to control heart rate. Pacemaker - blood vessels that carry blood away from the heart. Blood is under greater pressure, bright red. Arteries - blood vessels that carry blood toward the heart. There is less pressure bluish because of carbon-dioxide content. Veins - tiny vessels substances are exchanged between the blood and body cells Capillaries Pulse - Anywhere the arteries pass close to the skin, there is a pulse, you feel the heart beat. Examples: wrist, neck, temple, behind the knees

  6. Circulatory System Information Clarifying ?s Blood flows from the heart to the aorta (body’s biggest artery), to smaller arteries, then to tiny capillaries. 1. passes through kidneys, wastes filtered out of blood What does blood do? 2. flows through liver, toxins (medicine, alcohol, chemicals) are filtered out of the blood. 3. flows through organs, muscles and other body parts, nutrients/oxygen delivered, wastes are picked up. 4. flows through the lungs, carbon dioxide is left, oxygen absorbed. From capillaries, the blood goes through small veins, then the largest vein- the superior vena-cava, back into heart. Summary:

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