tailieunhanh - Handbook of general anatomy (Second edition): Part 2

(BQ) Continued part 1, part 2 of the document Handbook of general anatomy (Second edition) has contents: Muscular system, cardiovascular system, lymphatic system, nervous system, endocrine system, urogenital system, radiological anatomy, medical genetics,. and other contents. Invite you to refer. | CHAPTER Muscular System Learning Objectives ------------------------------------ After studying this chapter the student should be able to define muscles and describe their four basic properties differentiate skeletal cardiac and smooth muscles describe the gross features of a typical skeletal muscle and discuss the lubricating device which facilitates movements of muscle tendons compare and contrast the red and white fibers in the skeletal muscle describe the various types of muscle fiber architecture and biomechanical advantage of each type discuss the microscopic features of a skeletal muscle define motor unit and explain why motor units are considered as basic functional units of muscle contraction use examples to describe the various ways in which the muscles are named discuss group action of muscles and explain what is meant by synergistic and antagonistic muscle groups correctly solve the review questions given at the end of the chapter INTRODUCTION The muscle is a contractile tissue of the body derived from the mesodermal layer of embryonic germ forms the red flesh of the body and accounts for about 40 of the body weight. The muscles tissue is composed of differentiated cells containing contractile proteins. The structural biology of these proteins generates the forces necessary for cellular contraction. Thus muscles are responsible for bringing about movements within the certain organs and the body as a whole. Hence they are regarded as the motors of the body Fig. . Fig. Muscles the motors of the body moving its various parts. Thus muscle can be defined as follows It is a contractile tissue which brings about the movements of organs and body as whole. . All the muscles of the body develop from mesenchyme except arrectores pilorum muscles of iris and myoepithelial cells of glands which develop from ectoderm. 120 General Anatomy TYPES OF MUSCLES On the basis of morphological and functional characteristics the muscles are classified into .

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