BIOL164Ch12NotesWin12

BIOL164Ch12NotesWin12 - Ch. 12 The Cardiovascular and...

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1 Ch. 12 – The Cardiovascular and Lymphatic Systems • Together, they make up the circulatory system Blood was discussed in Ch. 11 – The focus of Ch. 12 is the heart and blood vessels for the cardiovascular system (with a little bit about the lymphatic system, too) The heart • = the muscular pump of the CV system – It beats ~ 100,000 times per day! • It pumps ~ 9000 liters of blood per day!! Figure 12.7a
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2 The heart is a double pump • The right heart : – Powers the pulmonary circuit – Pumps blood to and from the lungs – Receives blood from the systemic circuit • The left heart : – Powers the systemic circuit – Pumps blood to and from the rest of the body – Receives blood from the pulmonary circuit Figure 12.9 A quick note on arteries vs. veins Definitions : Arteries carry blood away from the heart Veins carry blood towards the heart About color : – While most arteries are systemic and carry oxygen-rich blood (and thus are red) , the pulmonary arteries are a notable exception – While most veins are systemic and carry oxygen-poor blood (and thus are blue) , the pulmonary veins are a notable exception Pulmonary artery Pulmonary vein Figure 12.7c
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3 The location of the heart and the pericardium Pericardium = a fibrous, multi- layered sac (with a watery fluid between the layers) that surrounds, protects, anchors, and lubricates the heart Figure 12.7b The heart wall • Its outermost layer is the pericardium • Its middle, thickest layer is the myocardium (= cardiac muscle tissue) – It’s thicker on the left side…why? • Its innermost layer is a thin, smooth endocardium Figure 12.7d Figure 4.3
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4 Some cardiac anatomy Papillary muscles Figure 12.7d A schematic heart
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5 Heart valves Are one-way valves that prevent the backflow of blood – They open when the upstream pressure is higher – They close when the downstream pressure is higher
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This note was uploaded on 03/12/2012 for the course BIOL 164 taught by Professor Tonychennault during the Winter '12 term at Clark College.

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BIOL164Ch12NotesWin12 - Ch. 12 The Cardiovascular and...

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