ASU BIO 201 Muscles Exam Questions and Answers Already Passed
Muscles Function - Answers Four important functions:
- Produce movement: responsible for all locomotion and manipulation
ex: walking,digesting,pumping blood
-Maintain posture and body position
-stabilize joints
-Generate heat as they contract
additional functions
-protects organs
-form valves
-control pupil size
-cause "goosebumps"
Characteristics of muscles - Answers Responsiveness (excitability)
-To chemical signals, stretch and electrical changes across the plasma membrane
*conductivity*
-local electical change triggers a wave of excitation that travels along the muscle fiber
Contractility
Extensibility
- capable of being stretched between contacrtions
Elasticity
-returns to its original resting length after being stretched
Connective tissue sheaths - Answers Each muscle fiber is covered in connective tissue
supports cells and reinforce whole muscle
sheaths from external to internal:
Epimysium: (dense irregular connective tissue surrounding musles : may blend with fascia
, Perimysium ( fibrous connective tissue surrounding FASCICLES) ( groups of musles fibers)
Edomysium Fine areolar connective tissue
Insertion - Answers attachment to moveable bone
orgin - Answers attachment to immovable or less movable bone
Direct ( fleshy) - Answers epimysium fused to periosteum of bone or perichondrium of carilage
indirect - Answers connective tissue wrappings extend beyond muscle as ropelike TENDON or sheet like
APONEUROSIS
Myofibrils - Answers Sacromere
SMALLEST CONTRACTILE UNIT (FUNCTIONAL UNIT) OF MUSCLE FIBERS
consists of are between Z discs
- contract bring Z discs closer together
individual sacromeres algin end to end along myofibril, like boxcars of train
Sarcomere - Answers I band to an A band to an I band that is a sarcomere
z disc to Z disc
Filaments - Answers They slide past eachother
Myofiliments -> Contractile protein
Thick filament - Answers Thick Filament consists of myosin molecules whose heads protrude at opposite
ends
Thin Filament - Answers a thin filament consist of two strands of actin subunits twisted into a helix plus
two types of regulatory proteins ( troponin and tropomyosin)
Troponin - Answers
tropomyosin - Answers
actin - Answers
Myosin head - Answers
Dystrophin - Answers Links thin filaments to proteins of sarcolemma
Muscles Function - Answers Four important functions:
- Produce movement: responsible for all locomotion and manipulation
ex: walking,digesting,pumping blood
-Maintain posture and body position
-stabilize joints
-Generate heat as they contract
additional functions
-protects organs
-form valves
-control pupil size
-cause "goosebumps"
Characteristics of muscles - Answers Responsiveness (excitability)
-To chemical signals, stretch and electrical changes across the plasma membrane
*conductivity*
-local electical change triggers a wave of excitation that travels along the muscle fiber
Contractility
Extensibility
- capable of being stretched between contacrtions
Elasticity
-returns to its original resting length after being stretched
Connective tissue sheaths - Answers Each muscle fiber is covered in connective tissue
supports cells and reinforce whole muscle
sheaths from external to internal:
Epimysium: (dense irregular connective tissue surrounding musles : may blend with fascia
, Perimysium ( fibrous connective tissue surrounding FASCICLES) ( groups of musles fibers)
Edomysium Fine areolar connective tissue
Insertion - Answers attachment to moveable bone
orgin - Answers attachment to immovable or less movable bone
Direct ( fleshy) - Answers epimysium fused to periosteum of bone or perichondrium of carilage
indirect - Answers connective tissue wrappings extend beyond muscle as ropelike TENDON or sheet like
APONEUROSIS
Myofibrils - Answers Sacromere
SMALLEST CONTRACTILE UNIT (FUNCTIONAL UNIT) OF MUSCLE FIBERS
consists of are between Z discs
- contract bring Z discs closer together
individual sacromeres algin end to end along myofibril, like boxcars of train
Sarcomere - Answers I band to an A band to an I band that is a sarcomere
z disc to Z disc
Filaments - Answers They slide past eachother
Myofiliments -> Contractile protein
Thick filament - Answers Thick Filament consists of myosin molecules whose heads protrude at opposite
ends
Thin Filament - Answers a thin filament consist of two strands of actin subunits twisted into a helix plus
two types of regulatory proteins ( troponin and tropomyosin)
Troponin - Answers
tropomyosin - Answers
actin - Answers
Myosin head - Answers
Dystrophin - Answers Links thin filaments to proteins of sarcolemma
