Bio 252 Final Exam Chamberlain LV exam with correct answers

Bio 252 Final Exam Chamberlain LV exam
with correct answers

Muscle| Tissue| Property:| Electrical| Excitability| -| VERIFIED| ANSWER✔✔-ions| are| charged| molecules|
that| have| different| concentrations| between| a| semipermeable| membrane

Muscular| Tissue| Property:| Contractility| -| VERIFIED| ANSWER✔✔-the| ability| to| forcefully| contract

Muscular| Tissue| Property:| Extensibility| -| VERIFIED| ANSWER✔✔-the| ability| to| stretch

Muscular| Tissue| Property:| Elasticity| -| VERIFIED| ANSWER✔✔-the| ability| to| return| to| your| original|
shape

Microscopic| Anatomy| of| a| Skeletal| Muscle| Fiber| -| VERIFIED| ANSWER✔✔--each| mature| skeletal|
muscle| fiber| has| 100+| nuclei

-once| fusion| has| occurred| the| muscle| fiber| loses| its| ability| to| undergo| cell| division

-skeletal| muscles| are| set| before| you| are| born| and| last| a| life| time

Control| of| Muscle| Tension:| Sliding| Filament| Mechanism| -| VERIFIED| ANSWER✔✔--myosin| pulls| on|
actin,| causing| thin| filament| to| slide| forward

-consequently,| Z| discs| move| toward| each| other| and| the| sarcomere| shortens

-thanks| to| structural| proteins,| there| is| a| transmission| of| force| throughout| the| entire| muscle

***Filaments| do| not| change| in| length

Isotonic| -| VERIFIED| ANSWER✔✔-tension| is| constant| while| muscle| length| changes

-concentric=picking| up| book

-eccentric=lowering| book

Isometric| -| VERIFIED| ANSWER✔✔-muscle| contracts| but| does| not| change| length

-holding| a| book| out| steady

actin| -| VERIFIED| ANSWER✔✔-During| active| muscle| contraction,| myosin| heads| bind| to| the| protein|
_______________.

calcium| -| VERIFIED| ANSWER✔✔-________________| is| released| from| the| sarcoplasmic| reticulum| and|
plays| a| key| role| in| active| muscle| contraction

Functions| of| Skeletal| System| -| VERIFIED| ANSWER✔✔-1.| facillitating| movement

2.| generating| heat| (thermogenesis)

, 3.| Storing| glycogen

4.| maintaining| body| posture

How| individual| muscle| fibers| generate| ATP| -| VERIFIED| ANSWER✔✔-1.| glycolysis| (anaerobic|
respiration)

2.| hydrolysis| of| creatine| phosphate|

3.| krebs| cycle/electron| transport| chain| (aerobic| respiration)

actin,myosin| -| VERIFIED| ANSWER✔✔-In| a| given| muscle| fiber,| the| thin| filaments| are| known| as|
_____________,| and| the| thick| filaments| are| known| as| _____________.

Components| of| Skeletal| Muscle| (Lg| to| Sm)| -| VERIFIED| ANSWER✔✔-1.| Skeletal| Muscle

2.| Fascicle

3.| Muscle| Fiber| (cell)

4.| Myofibrol

5.| Filaments

Sarcolemma| -| VERIFIED| ANSWER✔✔-cell| membrane| of| individual| muscle| cell

Origin| -| VERIFIED| ANSWER✔✔-the| attachment| to| the| stationary| bone| (bone| that| does| not| move)|
Proximal

Insertion| -| VERIFIED| ANSWER✔✔-the| attachment| to| the| movable| bone| (distal)

Fulcrum| -| VERIFIED| ANSWER✔✔-elbow| joint

Effort| -| VERIFIED| ANSWER✔✔-amount| of| force

ex:| contraction| of| biceps| brachii

Load| -| VERIFIED| ANSWER✔✔-weight| of| object| plus| forearm| (resistance)

(opposes| movement)

Muscles| of| the| thigh| that| move| the| femur,| tibia| and| fibula:|

Quadriceps| Femoris| =| Four| heads

1.| Rectus| femoris

2.| Vastus| lateralis

3.| Vastus| medialis

4.| Vastus| intermedius| -| VERIFIED| ANSWER✔✔-all| four| heads| extend| leg| at| knee| joint;| rectus| femoris|
muscle| acting| alone| also| flexes| thigh| at| hip| joint

Muscles| of| the| thigh| that| move| the| femur,| tibia| and| fibula:|