Chapter 12: Muscle Physiology PDF
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This document discusses the skeletal muscle structure and physiology. It includes diagrams and explanations of muscle anatomy, types of muscle tissue and their functions.
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... ,r Exam 3 Topics ► Chapter 12 - Muscle Physiology 0 Chapter 13 - Card iac Funct ion 0 Chap t er 14 - Blood Vessels & Bloo d Pressure Chapter 12: Muscle Physiology Wedner.da~, U'J.S/1-4 Skeletal Muscle Structure Muscles are the effectors of movement , a nd they act on impu lses sent from the nerv...
... ,r Exam 3 Topics ► Chapter 12 - Muscle Physiology 0 Chapter 13 - Card iac Funct ion 0 Chap t er 14 - Blood Vessels & Bloo d Pressure Chapter 12: Muscle Physiology Wedner.da~, U'J.S/1-4 Skeletal Muscle Structure Muscles are the effectors of movement , a nd they act on impu lses sent from the nervous system. In this chapter, we will focus on skeletal muscle, which is attached to the ske leton and p roduces movement of the body and face. The follow ing diagram shows the gross anatomy of a typical musc le. Note, however, that muscles often have many m ore fa scicles than shown in this high ly stylized d iagram: FASCICLE (WRAPPED BYPEJUMYSIUM) MUSCLE BUNDLE (WRAPPED BYEPIMYSIUM) MUSCLEf'IBEJt (WRAPPED BYENDOMYSIUM) ENl>OMYSJUM. PERIMYSIUM Most skeletal muscles are connected to at least two bones by tendons, which are bands of connective tissue responsible for transm itt ing the force prod ucedby the mus.de.Jo_the bone. Skeletal muscles are unique in the bod y; they are long, with ~tiple~clei,. and they C.QII:!POSe roughly 80 % of the b.\.J.i::AeFt-1,udT, Because of this, t hey have individual names associated w ith their m icroscopic parts. Skeletal muscles are organs because t hey consist of multiple tissue types, including skeletal muscle tissue, connecti ve t issue, blood vessels, and nerves. Muscles consist of many fascicles (bund les) of individual muscle cells (wh ich are a lso referred to as muscle fibers, myofibers, or myocytes). ~~,~'Ii' Note that muscles and groups of muscles are surrounded by bund les of connective tissue Q,f'~f;j'('('i _~~~ \ that provide a glid ing and sliding environment for muscles. The connective tissue sheat hs run the entire length of t he muscle fi ber and are actually longer tha n t he m uscle fiber itself.., ~'oe< '->-~ Individual muscle fi bers are wrapped in connective tissue cal led the endomysium, individua l , «":::."o' c., fascic les are wrapped in a layer of connective tissue called the perimysium, and all of the ~ ~,
