ASU BIO 201- Muscles| Quizzes with 100% Correct
Solutions & Verified
Muscles Function - ANSWER 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 - ANSWER 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 - ANSWER 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 - ANSWER attachment to moveable bone
orgin - ANSWER attachment to immovable or less movable bone
Direct ( fleshy) - ANSWER epimysium fused to periosteum of bone or perichondrium of
carilage
indirect - ANSWER connective tissue wrappings extend beyond muscle as ropelike
TENDON or sheet like APONEUROSIS
Myofibrils - ANSWER 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 - ANSWER I band to an A band to an I band that is a sarcomere
z disc to Z disc
Solutions & Verified
Muscles Function - ANSWER 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 - ANSWER 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 - ANSWER 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 - ANSWER attachment to moveable bone
orgin - ANSWER attachment to immovable or less movable bone
Direct ( fleshy) - ANSWER epimysium fused to periosteum of bone or perichondrium of
carilage
indirect - ANSWER connective tissue wrappings extend beyond muscle as ropelike
TENDON or sheet like APONEUROSIS
Myofibrils - ANSWER 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 - ANSWER I band to an A band to an I band that is a sarcomere
z disc to Z disc
