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Biology 30S (gulp) But sheep have nice hearts… Equipment Pick these up (even if you are not cutting): Plastic apron Goggles Latex Gloves These should be at your table: Dissecting Tray Dissecting Kit Paper Towel Dissection Guide Supplies you will use: Set Up Start reading the dissection guide Cut out your labels when you are finished reading (use scissors from the front) Class orientation Rinse your pig heart Begin lab Anterior View Atria Ear-shaped extensions of the atria. Rt. Lt. The atria wrap around to the anterior side of the heart. Anterior The Coronary Vessels The cardiac muscle receives oxygen for metabolism and releases waste products into coronary vessels. Anterior View The Great Vessels The large veins & arteries, which transport blood to and from the heart muscle. Locating the great vessels: Anterior View--Aortic Arch Aorta Arising from the left ventricle of the heart is the largest artery of the body, the aorta. Rt. Lt. Anterior View--Aortic Arch Brachiocephalic trunk (innominate artery) Rt. Lt. common carotid Lt. Aorta: Posterior View Aorta Lt. Rt. Posterior View--Vena Cavae Superior Vena Cava Inferior Vena Cava Lt. Rt. Posterior View--Pulmonary Artery Lt. Pulmonary Artery Lt. Rt. Posterior View--Pulmonary Veins Rt. Lt. Pulmonary veins are inferior to pulmonary arteries. Rt. Lt. Pulmonary Vein Pulmonary Vein Dissect heart on the coronal plane. Open heart on dissection tray. Anterior half Posterior half Rt. Lt. Rt. Atrium Rt. Lt. Atrium Lt. Width of right ventricular wall Rt. Ventricle Width of left ventricular wall Lt. Ventricle Tricuspid valve Cusp of valve Papillary muscles Chordae tendinae Mitral valve Chordae tendinae Chordae tendinae Check points--Exterior Heart Students should be able to point out: •Apex of heart •Ventricles & Atria •Coronary Vessels •Aorta •Pulmonary Artery & Vein •Sup & Inf Vena Cava Check points--Interior Heart Students should be able to point out: •Septum •Atria & Ventricles •Aorta, Pulm Artery and Vein •Sup & Inf Vena Cava •Tricuspid Valve, Pulmonary Valve •Mitral Valve, Aortic Valve Final Check point Students should be able to trace pathway of blood through great vessels and heart. (begin with vena cava and end with vena cava) Anterior View •Rinse your heart under the sink and pat it dry with paper towel •Notice the coronary artery angling from the left atrium to the right ventricle Posterior View Label external structures Right Side Right Side Start your incision in the vena cava and cut through the rt. Atria and rt. Ventricle all the way to the apex. Left Side Start your incision in the left atrium and continue through the left ventricle to the apex. • Open heart on dissection tray. Anterior half •Be sure to pat your heart dry with paper towel before attaching labels Posterior half Rt. Lt. That’s All folks! …and don’t forget to clean up. Clean Up Dispose of paper towels and labels Hearts go into the blue plastic bag (Ms. Harder) Wash all of your tools and rinse your dissecting trays (remove bottom and rinse if possible) Lay removable bottoms over the edge Place dry tools on paper towel on tray bottoms! Leave kits open! Wipe off all counters Dispose of your gloves in the garbage Wipe off your apron (pail and rag on front bench)