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Muscle Tissue (Skeletal Muscle Tissue # (SACROMERE (Actin = Thin filament,…
Muscle Tissue
Skeletal Muscle Tissue
#
Attached to bone
Control contractions and relaxation
Sometimes contracts in response to reflexes
Cells join up to create muscle fibre
Long strands of cells
Nuclei
Cytoplasm
(Many) Mitochondria
Sarcoplasmic Reticulum
Secilised Endoplasmic reticulum
Sarcolemma
Cell surface membrane of each muscle fibre
Myofibril
basic-rod shaped unit of muscle cell
SACROMERE
Span from one z-band to the next
Approximately 2.5 Micrometers when relaxed
I-Band and H-Zone reduces size during contractions
A-Band does not contract
Actin = Thin filament
Overlap Myosic during muscle contractions
Myosin = Thick filament
Elastic at I-Band is called Titin
Two types of muscles fibres
Fast Twitch Oxidative
Similar structure to slow twitch muscles
Many Mitochondria, Myoglobin and blood capilleries
Able to hydrolyse ATP very quickly
Contract quickly
Hydrolyse - Break down a compound with water reaction
#
Fatigue resisitance
Slow Twitch
Effective at using Oxygen
Effestive at using ATP energy
Aerobic resperation
Marathon runners
Endurance cycilists
Fibres
Less sarcoplasmic reticulum
More Mitochondria for sustained contraction
More MYglobin
Dense capillary network
Fast twitch glycolytic
Less Mithchondria
Less Myoglobin
Less Blood capillaries
Large concentration of glycogen
Provides fuel for anaerobic resperation
Glycogen = Glucose molecules bonded together
Stored in liver and muscles
Contract rapidly
Fatigue quickly
