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BYU-I - BIO 264 - BIO 264: Anatomy & Physiology 1 - Notes for module 7

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BYU-I - BIO 264 - BIO 264: Anatomy & Physiology 1 - Notes for module 7

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background image      BIO 264 – ANATOMY & PHYSIOLOGY I    Module 7 Notes: SKELETAL MUSCLE  MAIN IDEAS:      The physiological structure of the skeletal muscle is composed of muscular tissue.   i.  Main functions of muscle tissue includes   (a) Movement – rigidity and support. 
(b) Maintenance of posture – muscle tissues helps us to maintain normal posture. 
(c) Respiration – muscular system helps to bring in air and send them out when needed. 
(d) Heat generation – To maintain homeostasis in certain conditions through 
(e) Communication – our appearances such as speech, body language and 
communication activities are carried out through muscles. 
(f) Constriction of organs & blood vessels – relaxation of muscles helps in regulation of 
(g) Pumping blood – the human heart is entirely made of muscles that contract and 
relax to keep us alive through blood supply. 
ii.  Properties of muscle tissues include  
(a) Contractibility – the ability of muscle cells to forcefully shorten. 
(b) Excitability – the ability to respond to a stimulus, which may be delivered from a 
motor neuron or a hormone. 
(c) Extensibility – the ability of a muscle to be stretched. 
(d) Elasticity – the ability to recoil or bounce back to the muscle's original length after 
being stretched. 
Fatigue  describe a condition in which the muscle is no longer able to contract optimally.  This has two types: Central fatigue and Peripheral fatigue.  Energy sources of muscle include  Cytosolic ATP – the "floating" pool of ATP, or that which is present and available in the 
Creatine Phosphate – a high-energy compound that can rapidly transfer its phosphate to a 
molecule of ADP to quickly replenish ATP without the use of oxygen. 
Glycolysis – the breakdown of glucose. The primary source of glucose for this process is from 
glycogen that is stored in the muscle; it can also function in the absence of oxygen. 
Aerobic or oxidative respiration – this happens when continuous supplies of ATP are required
the cells employ metabolic mechanisms housed in the mitochondria that utilize oxygen. 
IMPORTANT NOTES    There are three types of muscles in the body.  i.  Skeletal muscles:  a voluntary muscle;  striated (striped – because it has a microscopically  streaked or striped appearance). 

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School: Brigham Young University - Idaho
Department: Biology
Course: Human Anatomy and Physiology I
Professor: Lanning Baker
Term: Fall 2016
Tags: bio264, anatomy, Physiology, and Skeletal
Name: BIO 264: Anatomy & Physiology 1 - Notes for module 7
Description: Class notes for module 7 of BIO 264
Uploaded: 10/24/2017
2 Pages 11 Views 8 Unlocks
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