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Lecture 3

KINE 1P90 Lecture Notes - Lecture 3: Rigor Mortis, Acetylcholinesterase, Reuptake


Department
Physical Education and Kinesiology
Course Code
KINE 1P90
Professor
Klentrou Panagiota
Lecture
3

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Muscle
Comprises largest groups of tissue in the body
Three types of muscle
oSkeletal muscle
Make up muscular system
oCardiac muscle
Found only in the heart
oSmooth muscle
Appears throughout the body systems as components of hollow organs and
tubes
Classified in two different ways
oStriated or unstriated
oVoluntary or involuntary
Functions of Muscle
Locomotion
Stability
oPosture
oResist gravity
Communication
oFacial expressions
oSpeaking
oWriting
Control body's openings
oSphincter muscles
Heat production
oShivering
Fuel storage
oGlucose (glycogen in muscle)
oCarbs
Gross anatomy of the Muscle
Origin
oMuscle attachment to the none at the stationary end (head)
oTends to be more proximal
Insertion
oBony attachment at the more mobile end
oTends to be more distal
Belly
oThicker middle region
Prime mover (agonist)
oMuscles that provides most of the force for a given movement
oInitiates movement and carry it on

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Antagonist muscles
oMuscles that produce opposite movements
oOpposite to prime mover
Synergistic muscle
oMuscles that work together to produce the same movement
oAssist prime mover
Structure of skeletal muscle
Muscle consists of a number of muscle fibres lying parallel to one another and held
together by connective tissue
Single skeletal muscle cell is known as a muscle fibre
oMultinucleated
oLarge, elongated, and cylindrically shaped
oFibres usually extend entire length of muscle
Macroscopic Structure: Connective Tissue
Muscle is composed of muscle tissue and connective tissue
Multiple layers of connective tissue
oFascia
Thick connective tissue around the entire muscle
Strong
Extension of tendenous tissue
Separates muscle from skin
Holds muscle of similar function together
3 types of connective tissue - extensions of deep fascia (most superficial to
deep)
Epimysium
Layer of connective tissue around entire muscle - deep to
superficial fascia
Epi- means on top
Perimysium
Connective tissue that surrounds a bundle of muscle fibres
(muscle cells)
Peri- around
Fasciculus (singular)
Fascicles (plural)
Endomysium
Surrounds each muscle fibre (cell)
thin
Endo- inside
Capillaries and nerves run along surface
Microscopic organization
inside the muscle cell
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