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Published byNickolas Claud Sanders Modified over 9 years ago
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HANGERS Decide between you and your table partner who will bring in a hanger for Friday’s activity.
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LECTURE 28: CIRCULATORY AND RESPIRATORY
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CIRCULATORY SYSTEM Function Transports nutrients and waste throughout the body
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STRUCTURES 1.Heart : muscular organ that pumps blood Divided into right and left by septum Each side has an upper section (atrium) and lower section (ventricle).
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STRUCTURES, CONT. 2. Vessels: smooth muscle surrounded by connective tissue
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STRUCTURES, CONT. arteries – carries blood AWAY from the heart veins –carries blood to the heart
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STRUCTURES, CONT. capillaries – narrow blood vessels that allow for gas exchange to occur
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STRUCTURES, CONT. 3. Blood PLASMA: liquid medium made of 90% water, sugar, salts, amino acids, vitamins, minerals RED BLOOD CELLS (erythrocytes): transport CO 2 and O 2 gas Contains hemoglobin (O2 binds here) Lacks nucleus to increase space
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STRUCTURES, CONT. WHITE BLOOD CELLS (leukocytes): fight pathogens PLATELETS: form blood clots
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MOVEMENT OF BLOOD Two Circuits (Pathways) 1. Pulmonary (deoxygenated) right side of heart sends blood to the LUNGS
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MOVEMENT OF BLOOD 2. Systemic (oxygenated) left side of heart sends blood to BODY
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RESPIRATORY SYSTEM
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External Function Exchange of gases between atmosphere and blood Pathway mouth/nose pharynx epiglottis trachea bronchi lungs
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MECHANISM Diaphragm contracts and pulls the thoracic cavity down causing the lungs to fill with air
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INTERNAL FUNCTION Exchange of gases between blood and other body cells Gases diffuse across due to concentration gradients….. DIFFUSSION! https://www.youtube.com/watch?v=d-f3RL0KiUg
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