Bio 252 Final Exam Chamberlain LV
UPDATED ACTUAL Exam Questions and
CORRECT Answers
Muscle Tissue Property: Electrical Excitability - CORRECT ANSWER -ions are charged
molecules that have different concentrations between a semipermeable membrane
Muscular Tissue Property: Contractility - CORRECT ANSWER -the ability to forcefully
contract
Muscular Tissue Property: Extensibility - CORRECT ANSWER -the ability to stretch
Muscular Tissue Property: Elasticity - CORRECT ANSWER -the ability to return to your
original shape
Microscopic Anatomy of a Skeletal Muscle Fiber - CORRECT 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 - CORRECT 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 - CORRECT ANSWER -tension is constant while muscle length changes
-concentric=picking up book
-eccentric=lowering book
,Isometric - CORRECT ANSWER -muscle contracts but does not change length
-holding a book out steady
actin - CORRECT ANSWER -During active muscle contraction, myosin heads bind to the
protein _______________.
calcium - CORRECT ANSWER -________________ is released from the sarcoplasmic
reticulum and plays a key role in active muscle contraction
Functions of Skeletal System - CORRECT ANSWER -1. facillitating movement
2. generating heat (thermogenesis)
3. Storing glycogen
4. maintaining body posture
How individual muscle fibers generate ATP - CORRECT ANSWER -1. glycolysis
(anaerobic respiration)
2. hydrolysis of creatine phosphate
3. krebs cycle/electron transport chain (aerobic respiration)
actin,myosin - CORRECT 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) - CORRECT ANSWER -1. Skeletal Muscle
2. Fascicle
3. Muscle Fiber (cell)
4. Myofibrol
5. Filaments
, Sarcolemma - CORRECT ANSWER -cell membrane of individual muscle cell
Origin - CORRECT ANSWER -the attachment to the stationary bone (bone that does not
move) Proximal
Insertion - CORRECT ANSWER -the attachment to the movable bone (distal)
Fulcrum - CORRECT ANSWER -elbow joint
Effort - CORRECT ANSWER -amount of force
ex: contraction of biceps brachii
Load - CORRECT 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 - CORRECT 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:
Sartorius - CORRECT ANSWER -weakly flexes leg out at knee joint; weakly flexes,
abducts, and laterally rotates thigh at hip joint
Muscles of the thigh that move the femur, tibia and fibula:
UPDATED ACTUAL Exam Questions and
CORRECT Answers
Muscle Tissue Property: Electrical Excitability - CORRECT ANSWER -ions are charged
molecules that have different concentrations between a semipermeable membrane
Muscular Tissue Property: Contractility - CORRECT ANSWER -the ability to forcefully
contract
Muscular Tissue Property: Extensibility - CORRECT ANSWER -the ability to stretch
Muscular Tissue Property: Elasticity - CORRECT ANSWER -the ability to return to your
original shape
Microscopic Anatomy of a Skeletal Muscle Fiber - CORRECT 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 - CORRECT 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 - CORRECT ANSWER -tension is constant while muscle length changes
-concentric=picking up book
-eccentric=lowering book
,Isometric - CORRECT ANSWER -muscle contracts but does not change length
-holding a book out steady
actin - CORRECT ANSWER -During active muscle contraction, myosin heads bind to the
protein _______________.
calcium - CORRECT ANSWER -________________ is released from the sarcoplasmic
reticulum and plays a key role in active muscle contraction
Functions of Skeletal System - CORRECT ANSWER -1. facillitating movement
2. generating heat (thermogenesis)
3. Storing glycogen
4. maintaining body posture
How individual muscle fibers generate ATP - CORRECT ANSWER -1. glycolysis
(anaerobic respiration)
2. hydrolysis of creatine phosphate
3. krebs cycle/electron transport chain (aerobic respiration)
actin,myosin - CORRECT 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) - CORRECT ANSWER -1. Skeletal Muscle
2. Fascicle
3. Muscle Fiber (cell)
4. Myofibrol
5. Filaments
, Sarcolemma - CORRECT ANSWER -cell membrane of individual muscle cell
Origin - CORRECT ANSWER -the attachment to the stationary bone (bone that does not
move) Proximal
Insertion - CORRECT ANSWER -the attachment to the movable bone (distal)
Fulcrum - CORRECT ANSWER -elbow joint
Effort - CORRECT ANSWER -amount of force
ex: contraction of biceps brachii
Load - CORRECT 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 - CORRECT 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:
Sartorius - CORRECT ANSWER -weakly flexes leg out at knee joint; weakly flexes,
abducts, and laterally rotates thigh at hip joint
Muscles of the thigh that move the femur, tibia and fibula:
