Biol129_c18 - Cardiovascular System The Heart Review: 4...

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1 Cardiovascular System The Heart • Review: 4 chambered pump • Valves at exit of each chamber • The latter both have three cusps – Close by back-pressure
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2 • The AV valves – Attached to papillary muscles by cordae tendineae – These keep valve closed during ventricular contraction (systole) The Heart - 2 Heart Circulation
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3 • Oxygenated blood has multiple paths back to the heart • These occur throughout the body and each performs very specific functions Blood Routes The Aorta • Divided into 4 parts • Ascending – Intrapericardial – Connects to coronary aa •A r ch – Connects to brachiocephalic, Lt common
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The Aorta - 2 • Descending (Thoracic) – Many local branches to: • Post. Intercostals • Abdominal • We will see these later • Common Carotid aa – Internal & External Carotid aa • Vertebral aa fr. Subclavian aa • Int Carotid & Vertebral aa join to serve brain. Ascending Arteries
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Biol129_c18 - Cardiovascular System The Heart Review: 4...

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