Structure of the Heart

MATERIALS NEEDED

textbook dissectible human heart model preserved sheep or other mammalian heart dissecting tray dissecting instruments

SAFETY

• Wear disposable gloves when working on the heart dissection.

• Save or dispose of the dissected heart as instructed.

• Wash the dissecting tray and instruments as instructed.

• Wash your laboratory table.

• Wash your hands before leaving the laboratory.

The heart is a muscular pump located within the mediastinum and resting upon the diaphragm. It is enclosed by the lungs, thoracic vertebrae, and sternum and attached to its top (the base) are several large blood vessels. Its distal end extends downward to the left and terminates as a bluntly pointed apex.

The heart and the proximal ends of the attached blood vessels are enclosed by a double-layered pericardium. The inner layer of this membrane consists of a thin covering that is closely applied to the surface of the heart, whereas the outer layer forms a tough, protective sac surrounding the heart.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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