Circulatory System

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Circulatory System
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What does the transport system do?

• Carries O2, CO2, nutrients, hormones, wastes,
  cells of the immune system
• Regulates body temp.

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Circulatory System

• Also known as the Cardiovascular System.
• It carries needed substances to cells and carries
  waste products away from cells.

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The Heart pumps blood through body
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Inside the heart
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Blood Vessels

• Arteries carry blood away from heart thick
  round muscular walls- no valves

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Blood Vessels

• Veins carry blood to the heart has valves to
  prevent backflow thin flattened shape

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Blood Vessels

• Capillaries one cell thick

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Whats in blood?

• Plasma carries nutrients, wastes, and water
• Red Blood Cells carry oxygen and carbon dioxide
• White Blood Cells fight infections
• Platelets help with blood clotting

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How do RBCs carry Oxygen?

• Hemoglobin a protein found on RBC attaches
  itself to both oxygen and carbon dioxide

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Pulmonary Circulation

• Blood flows from the heart to the lungs where it
  picks up O2 and loses CO2 and water vapor

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Pulmonary Circulation
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Artery

• Transports blood away from the heart.
• Very Muscular
• Very Elastic
• Thick Muscle Walls
• Aorta ? Largest Artery
• Carries oxygenated blood

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Veins

• Transports blood toward the Heart
• Thinner walls
• Valves? Prevents backflow
• Carries deoxygenated blood

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Capillaries

• One celled microscopic blood vessels
• Connect Arteries? Veins

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Heart ?Muscular organ pumps blood throughout the
body

• Valve? flap of tissue that prevents blood from
  flowing backwards.

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• Atrium?2 upper chambers, receive blood that comes
  into the heart

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• Ventricle? 2 lower chambers, pumps blood out of
  heart

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Pericardium

• Covers and protects the heart

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• What are the different types of molecules that
  are transported throughout the circulatory system?

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Molecules that travel through Circ.

• Nutrients from digested food
• O2 from the lungs
• Metabolic wastes (CO2)

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Molecules that travel through Circ.

• Hormones?help coordinate activities in body
• Heat?blood vessels constrict or relax

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Regulation of Heartbeat

• Pacemaker ? located in the right atrium, sends
  out signals that make the heart muscle contract.
  
• It receives messages about how much oxygen is
  present

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A Real Pacemaker
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Medical Pacemaker
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High Blood Pressure

• Disease caused when blood pressure in the
  arteries is increased by stress, diet, heredity,
  smoking, aging.

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Stroke

• When an area of the brain dies because the area
  didnt receive enough O2

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Heart Attack

• Symptoms? sharp, crushing, squeezing pain in the
  chest, cold sweats, nausea, limb numbness
• An area of the heart muscle dies and stops working

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Coronary Thrombosis

• Type of heart attack caused by blockage in one of
  the arteries that carry blood to the heart.
  Blockage of blood flow to the heart, damaged from
  lack of oxygen

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Leukemia

• Form of cancer in which bone marrow makes too
  many white blood cells

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Anemia

• When the blood doesnt have enough hemoglobin or
  RBC causing body cells to not receive enough O2

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Arteriosclerosis

• Fatty plaque builds up on wall of artery blocking
  normal blood flow

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Amazing Heart Facts

• Your heart is about the same size as your fist.
• An average adult body contains about f five
  quarts of blood.

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• By the time you turn 70, your heart will have
  beat some two-and-a-half billion times (figuring
  on an average
• of 70 beats per minute.)

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• The risk of heart attack is higher on Monday than
  any other day of the week.
• Each square inch of human skin consists of twenty
  feet of blood vessels.

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• All the blood vessels in the body joined end to
  end would stretch 62,000 miles or two and a half
  times around the earth.

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• 1.The heart circulates the body's blood supply
  about 1,000 times each day.
• 2. The heart pumps the equivalent of 5,000 to
  6,000 quarts of blood each day.