Mammalian Heart Dissection Lab Report

BIOLOGY REPORT

Title: Mammalian heart dissection

Name: Lambert Ntashamaje

Co-worker’s Name: Marc Koussi

Date of Experiment: 13th January 2017

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1.Introduction:

The aim of this experiment is to observe internal structure of a mammalian heart. The objective of this experiment is check how heart chambers, vessels and valves of the heart help the heart to achieve its function of pumping blood all over the body. In addition, this experiment would help us understand the double circulation of blood and reasons why it is vital for mammalian organisms.

Due to the complexity of mammalian organisms, the exchanges of substances such as oxygen, nutrients and hormones cannot rely on diffusion itself (Kent, 2013). The transportation

Furthermore, left side of the heart was still thicker than the right side of the heart.

Figure3: Internal part of right side of the heart

During the experiment, a scissors was used to cut the heart through the side of pulmonary artery alongside anterior interventricular artery; the cutting continued down into the wall of right ventricle.

The anterior interventricular artery, which is the direct continuation of the left coronary artery descends into anterior interventricular groove. This artery also sends a branch to the moderator band and the anterior papillary muscle of the tricuspid valve (right ventricle), which is reasonable that the moderator is part of the septomarginal trabeculae of the interventricular septum; this artery is often called moderator artery (Laizzo,

The natural pacemakers of the heart called SA (Sino-atrial) node. SA is in the grooves where the superior vena cava meets the right atrium. After SA generates electrical signals, the cardiac impulse travels across the walls of the atria causing the atria to contract. The impulses generated by the SA node are also transmitted to the atrioventricular (AV) node located in the lower part of the right atrium near the right ventricle. When the electrical signals reach the ventricle walls from pacemakers, ventricles contract and builds up the pressure which pushes blood and opens semilunar valves.

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