BIO 252 FINAL EXAM CHAMBERLAIN LV EXAM
NEWEST 2025 ACTUAL EXAM
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 c
ontraction
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 k
nown 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:
Hamstrings:
1. Biceps femoris
2. Semitendinosus
3. Semimembranosus - correct answer-flexes leg at knee joint and extends the thigh at hip joint
Muscles of the thigh that move the femur, tibia and fibula:
Gracilis - correct answer-adducts thigh at hip joint, medially rotates thigh, flexes leg at knee joint
Central Nervous System (CNS) - correct answer-brain and spinal cord
NEWEST 2025 ACTUAL EXAM
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 c
ontraction
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 k
nown 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:
Hamstrings:
1. Biceps femoris
2. Semitendinosus
3. Semimembranosus - correct answer-flexes leg at knee joint and extends the thigh at hip joint
Muscles of the thigh that move the femur, tibia and fibula:
Gracilis - correct answer-adducts thigh at hip joint, medially rotates thigh, flexes leg at knee joint
Central Nervous System (CNS) - correct answer-brain and spinal cord
