BYU Cell 220 Exam 2 (CH 8-14) NEWEST 2025 COMPLETE
QUESTIONS AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND
NEW VERSION!!
6 properties of smooth muscle - CORRECT ANSWER- -found in walls of visceral organs
-fusiform shape (fat in the middle, tapers on the ends)
-uninucleate
-no striations
-fatigue resistant
-involuntary (you can't control it)
6 properties of skeletal muscle - CORRECT ANSWER- -large cylindrical shape
-multinucleate (because of large size)
-innervated at neruomuscular junctions (where nerve touches fiber)
-striated
-voluntary (you can control it)
-vascular
6 functions of skeletal muscle - CORRECT ANSWER- -movement
-posture
,-temperature regulation (like shivering)
-storage and movement of materials
-support abdominal organs (no bones cover them, only muscles)
-joint stabilization
myofibril - CORRECT ANSWER- type of organelle, made of chains of sarcomeres
myofiber - CORRECT ANSWER- collection of myofibrils, muscle cell
fascicle - CORRECT ANSWER- collection of myofibers
Sarcolemma - CORRECT ANSWER- plasma membrane of a muscle fiber / surrounds myofibrils
endomysium - CORRECT ANSWER- wraps myofibers
perimysium - CORRECT ANSWER- wraps fascicles
epimysium - CORRECT ANSWER- wraps entire muscles
deep fascia - CORRECT ANSWER- wraps muscle groups
tendon - CORRECT ANSWER- -connects muscle to muscle
-continuous with collagen fibers of -mysium's
3 types of muscle tissue - CORRECT ANSWER- -skeletal
,-cardiac
-smooth
4 properties of muscle tissue - CORRECT ANSWER- -excitability (measured with EKG or EMG)
-contractility (ability to shorten)
-elasticity (ability to return to original length)
-extensibility (stretchable)
6 properties of cardiac muscle - CORRECT ANSWER- -found in heart myocardium
-y-shaped branched fibers
-uninucleate or binucleate
-intercalated discs
-striated
-auto-rhythmic (can beat without nervous system)
Flat tendons are called - CORRECT ANSWER- aponeuroses
muscle origin - CORRECT ANSWER- less moveable attachment site of muscles
muscle insertion - CORRECT ANSWER- more moveable attachment site of muscles
sarcomere - CORRECT ANSWER- -functional unit of the myofibril
-if the myofibril is a train, sarcomeres are the boxcars
, z discs - CORRECT ANSWER- border of the sarcomere
actin - CORRECT ANSWER- thin filament
myosin - CORRECT ANSWER- thick filament, attaches to and pulls actin
sarcoplasmic reticulum - CORRECT ANSWER- -skeletal muscle version of the endoplasmic
reticulum
-stores calcium
troponin/tropomyosin - CORRECT ANSWER- calcium binds troponin to move tropomyosin out
of the way of the myosin binding sites
motor neurons - CORRECT ANSWER- nervous cells that stimulate the muscular system
definition excitation - CORRECT ANSWER- nervous stimulation
action potential - CORRECT ANSWER- electrical impulse
steps of muscle excitation - CORRECT ANSWER- -motor neuron releases nerve impulse (action
potential)
-action potential stimulates synaptic vesicle containing acetylcholine (ACh)
-ACh crosses synaptic cleft to sarcolemma and opens sodium ion channels
-t-tubules of the sarcolemma bring action potential down to terminal cisternae of the
sarcoplasmic reticulum
QUESTIONS AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND
NEW VERSION!!
6 properties of smooth muscle - CORRECT ANSWER- -found in walls of visceral organs
-fusiform shape (fat in the middle, tapers on the ends)
-uninucleate
-no striations
-fatigue resistant
-involuntary (you can't control it)
6 properties of skeletal muscle - CORRECT ANSWER- -large cylindrical shape
-multinucleate (because of large size)
-innervated at neruomuscular junctions (where nerve touches fiber)
-striated
-voluntary (you can control it)
-vascular
6 functions of skeletal muscle - CORRECT ANSWER- -movement
-posture
,-temperature regulation (like shivering)
-storage and movement of materials
-support abdominal organs (no bones cover them, only muscles)
-joint stabilization
myofibril - CORRECT ANSWER- type of organelle, made of chains of sarcomeres
myofiber - CORRECT ANSWER- collection of myofibrils, muscle cell
fascicle - CORRECT ANSWER- collection of myofibers
Sarcolemma - CORRECT ANSWER- plasma membrane of a muscle fiber / surrounds myofibrils
endomysium - CORRECT ANSWER- wraps myofibers
perimysium - CORRECT ANSWER- wraps fascicles
epimysium - CORRECT ANSWER- wraps entire muscles
deep fascia - CORRECT ANSWER- wraps muscle groups
tendon - CORRECT ANSWER- -connects muscle to muscle
-continuous with collagen fibers of -mysium's
3 types of muscle tissue - CORRECT ANSWER- -skeletal
,-cardiac
-smooth
4 properties of muscle tissue - CORRECT ANSWER- -excitability (measured with EKG or EMG)
-contractility (ability to shorten)
-elasticity (ability to return to original length)
-extensibility (stretchable)
6 properties of cardiac muscle - CORRECT ANSWER- -found in heart myocardium
-y-shaped branched fibers
-uninucleate or binucleate
-intercalated discs
-striated
-auto-rhythmic (can beat without nervous system)
Flat tendons are called - CORRECT ANSWER- aponeuroses
muscle origin - CORRECT ANSWER- less moveable attachment site of muscles
muscle insertion - CORRECT ANSWER- more moveable attachment site of muscles
sarcomere - CORRECT ANSWER- -functional unit of the myofibril
-if the myofibril is a train, sarcomeres are the boxcars
, z discs - CORRECT ANSWER- border of the sarcomere
actin - CORRECT ANSWER- thin filament
myosin - CORRECT ANSWER- thick filament, attaches to and pulls actin
sarcoplasmic reticulum - CORRECT ANSWER- -skeletal muscle version of the endoplasmic
reticulum
-stores calcium
troponin/tropomyosin - CORRECT ANSWER- calcium binds troponin to move tropomyosin out
of the way of the myosin binding sites
motor neurons - CORRECT ANSWER- nervous cells that stimulate the muscular system
definition excitation - CORRECT ANSWER- nervous stimulation
action potential - CORRECT ANSWER- electrical impulse
steps of muscle excitation - CORRECT ANSWER- -motor neuron releases nerve impulse (action
potential)
-action potential stimulates synaptic vesicle containing acetylcholine (ACh)
-ACh crosses synaptic cleft to sarcolemma and opens sodium ion channels
-t-tubules of the sarcolemma bring action potential down to terminal cisternae of the
sarcoplasmic reticulum
