Muscular System - Chapter9:MuscularSystem o (motion o...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 9: Muscular System Functions of Muscular System: o Responsible for movement of parts of the body (motion) o Maintenance of posture and tone (stabilization) o Respiration (muscles of thorax) o Production of body heat (when muscles contract) o Communication (speaking, writing, typing, facial expressions) Properties of Muscle o Contractility: shortens/contracts forcefully Structures move or pressure inside an organ/vessel increases o Excitability: responds to stimuli  Conscious/unconscious By nerves and hormones o Extensibility: can be stretched/lengthened beyond resting length and still  contract o Elasticity: recoils to resting length after stretch Skeletal Muscle Structure o Table 9.1 (pg 276) To identify the components of a skeletal muscle fiber. Each skeletal muscle fiber is a multinucleated, striated cell containing a large number  of rod-like myofibrils that extend, in parallel, the entire length of the cell. Each  myofibril is composed of still smaller units, called myofilaments, that contain the  contractile proteins actin and myosin. o Skeletal muscle fibers (the cells) o Superior to deep: Fig. 9.1 (pg 277) Muscular fascia (dense irregular collagenous connective tissue) Arteries, nerves (motor neurons), veins Epimysium (dense collagenous connective tissue) Skeletal muscle belly, arteries, nerves (motor neurons), veins Perimysium Muscle fasciculi (bundles) Endomysium Muscle fibers, capillaries, veins, neurons, neuromuscular junctions Sarcolemma (surround myofibrils) 
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/16/2012 for the course KINESIOLOG 1Y03/1YY3 taught by Professor Parises during the Spring '11 term at McMaster University.

Page1 / 4

Muscular System - Chapter9:MuscularSystem o (motion o...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online