CIRCULATORY SYSTEM

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CIRCULATORY SYSTEM
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LABEL THE HEART

• NAMES OF LAYERS
• CHAMBERS
• VALVES
• MAJOR BLOOD VESSELS

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CARDIOVASCULAR SYSTEM

• ALSO KNOW AS CIRCULATORY SYSTEM

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CV SYSTEM

• HEART
• BLOOD VESSELS
• BLOOD

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TRANSPORTATION SYSTEM

• TRANSPORTS
• OXYGEN
• NUTRIENTS TO BODY CELLS
• CARBON DIOXIDE
• METABOLIC MATERIALS AWAY FROM BODY CELLS

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HEART

• MUSCULAR, HOLLOW ORGAN
• PUMP OF THE BODY
• SIZE OF CLOSED FIST
• LOCATED
• MEDIASTINAL CAVITY
• BETWEEN HEART AND LUNGS
• BEHIND STERNUM
• ABOVE DIAPHRAGM

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THREE LAYERS OF TISSUE

• ENDOCARDIUM
• MYOCARDIUM
• PERICARDIUM

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ENDOCARDIUM

• SMOOTH LAYER OF CELLS
• LINES THE INSIDE OF THE HEART BLOOD VESSELS
• ALLOWS FOR SMOOTH FLOW OF BLOOD

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MYOCARDIUM

• Thickest layer
• muscular middle layer

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PERICARDIUM

• DOUBLE LAYERED MEMBRANE OR SAC
• COVERS THE OUTSIDE OF THE HEART

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SEPTUM

• MUSCULAR WALL
• SEPARATES HEART INTO RIGHT AND LEFT SIDE
• PREVENTS BLOOD FROM MOVING BETWEEN THE RIGHT AND
  LEFT SIDE OF THE HEART
• UPPER PART OF SEPTUM CALLED
• INTERATRIAL SEPTUM
• LOWER PART CALLED
• INTERVENTRICULAR SEPTUM

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HEART CHAMBERS

• FOUR PARTS OR CHAMBERS
• TWO UPPER CHAMBERS
• ATRIA
• TWO LOWER CHAMBERS
• VENTRICLES

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VALVES

• TRICUSPID VALVE
• RIGHT ATRIUM RIGHT VENTRICLE
• PULMONARY VALVE
• RIGHT VENTRICLE AND PULMONARY ARTERY

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MITRAL VALVE

• LEFT ATRIUM AND LEFT VENTRICLE
• AORTIC VALVE

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HEART BEAT CYCLE

• RIGHT LEFT SIDES OF HEART WORK TOGETHER
• ELECTRICAL IMPULSE CAUSES MYOCARDIUM TO CONTRACT
• PERIOD OF CONTRACTION OR (SYSTOLE)
• FOLLOWED BY A BRIEF PERIOD OF REST (DIASTOLE)

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RIGHT ARTIUM

• RECEIVES BLOOD
• AS RETURNS FROM BODY
• enters right atrium from Inferior and Superior
  Vena Cava

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RIGHT VENTRICLE

• RECEIVES BLOOD
• FROM RIGHT ATRIUM
• PUSHES BLOOD
• INTO PULMONARY ARTERY WHICH CARRIES BLOOD TO
  LUNGS FOR OXYGEN

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LEFT ATRIUM

• RECEIVES OXYGENATED BLOOD FROM LUNGS

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LEFT VENTRICLE

• RECEIVES BLOOD FROM THE LEFT ATRIUM
• PUSHES BLOOD INTO THE AORTA

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VALVES

• ONE WAY VALVES IN CHAMBERS OF HEART KEEP BLOOD
  FLOWING IN RIGHT DIRECTION
• TRICUSPID
• PULMONARY
• MITRAL (Bicuspid)
• AORTIC

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CONDUCTIVE PATHWAY

• Electrical impulses starting in the heart cause
  contraction of the muscles.

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Sinoatrial node (SA)

• Group of nerves located in right atrium
• Pacemaker
• Sends electrical impulse that spreads over muscle
  of atria
• Atrial muscles contract then push blood into
  ventricels.
• After impulse goes through atria reaches the
  Atrioventricular (AV) node.

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Atrioventricular (AV) node

• Group of nerve cells
• Located between the atria and ventricles
• Electrical impulse through septum
• Nerve fibers in septum called bundle of HIS

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Bundle of HIS

• Nerve fibers in septum
• Right and left bundle branches

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Right and left bundle branches

• Carry impulse down through ventricles
• Subdivide into a network of nerve fibers in
  ventricle called purkinje fibers.

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Purkinje fibers

• Final conduction pathway
• Spread to all muscle tissue in the ventricles
• Ventricles contract

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Conduction

• Occurs approximately every 0.8 seconds.
• Electrical impulse can be recorded on an EKG
• Used to detect abnormal activity or disease.

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THE END