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PinkMonkey Online Study Guide-Biology

18.2 Heart

(A) Position and External Features of Heart

The human heart is a muscular, four chambered organ about the size of a clenched fist. It is located in the thorax between the lungs (mediastenum) and above the central depression of the diaphragm. It is somewhat cone-shaped with the broader end (base) upwards, and the blunt end (apex) lying on the diaphragm. It is slightly oriented towards the left. The heart weighs about 300 grams in males, and is usually slightly smaller in females.

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Figure 18.4 Ventral or Sternocostal view of the heart. Figure 18.5 Dorsal or Posterior view of the heart


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Table of Contents

18.0 - Introduction
18.1 - Closed Vascular System
18.2 - Heart
18.3 - Arterial Blood Pressure
18.4 - Blood

Chapter 19





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