RESPIRATORY AND CIRCULATORY SYSTEMS

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RESPIRATORY AND CIRCULATORY SYSTEMS
Warm-up 5/12 Describe the difference between
positive and negative feedback.

• pp. 933-939 AND 946-950

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CIRCULATORY SYSTEM

• moves fluid throughout the body

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STRUCTURES

• Heart muscular organ that pumps blood to all
  parts of the body.
• a. divided into right side and left side
  by septum
• b. each side has an upper section
  (atrium) and
• lower section (ventricle).

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• Vessels smooth muscle surrounded by connective
  tissue
• a. arteries carries blood from the heart
• b. aorta Largest artery.
• c. veins carries blood to the heart
• d. capillaries narrow blood vessels that
  pass
• blood in single file.

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MOVEMENT OF BLOOD

• right side (deoxygenated) blood from body to
  heart to lungs
• Body? vena cavae ? rt. atrium ? rt. ventricle ?
  
• pulm. arteries ? lungs

• left side (oxygenated) blood from lungs to the
  heart to body.
• Lungs ? Pulmonary veins ? lt. atrium ? lt.
• ventricle? aorta ? body

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• when the heart contracts, blood is squeezed from
  right atrium ? right ventricle
• when heart contracts a 2nd time, blood in right
  ventricle is sent through blood vessels into
  lungs.

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RESPIRATORY
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EXTERNAL FUNCTION

• exchange of gases between atmosphere and blood
• mouth/nose ? pharynx? epiglottis? trachea ?
• bronchi ?lungs

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MECHANISM

• Large skeletal muscle (diaphragm) contracts
  pulling lungs down causing them to fill with air

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INTERNAL FUNCTION

• exchange of gases between blood and cells
• Gases diffuse across due to concentration
  gradients
• lungs (alveoli) ? capillaries (carrying blood)

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Homework

• Circulatory and Respiratory WS
• Turn in Notebook

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Homework

• Read p. 933-939 AND 946-950
• Problems p 939 1,3,4,6
• Read 946-950 Problems p 950 1,3,4,6

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Warm-up 4/19

• Draw a heart and a loop of Artery/Vein (Aorta/
  Vena Cava) Lungs
• Label 4 chambers of heart. Show direction of
  blood flow.
• Turn in Warm-ups in Bin
• You have 5 min.