Bio 252 Final Exam Chamberlain LV
Questions and Answers 100% Pass
Muscle Tissue Property: Electrical Excitability - ✔✔ions are charged molecules that
have different concentrations between a semipermeable membrane
Muscular Tissue Property: Contractility - ✔✔the ability to forcefully contract
Muscular Tissue Property: Extensibility - ✔✔the ability to stretch
Muscular Tissue Property: Elasticity - ✔✔the ability to return to your original shape
Microscopic Anatomy of a Skeletal Muscle Fiber - ✔✔-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 - ✔✔-myosin pulls on actin,
causing thin filament to slide forward
-consequently, Z discs move toward each other and the sarcomere shortens
Katelyn Whitman, All Rights Reserved © 2025 1
,-thanks to structural proteins, there is a transmission of force throughout the entire
muscle
***Filaments do not change in length
Isotonic - ✔✔tension is constant while muscle length changes
-concentric=picking up book
-eccentric=lowering book
Isometric - ✔✔muscle contracts but does not change length
-holding a book out steady
actin - ✔✔During active muscle contraction, myosin heads bind to the protein
_______________.
calcium - ✔✔________________ is released from the sarcoplasmic reticulum and plays a
key role in active muscle contraction
Functions of Skeletal System - ✔✔1. facillitating movement
2. generating heat (thermogenesis)
3. Storing glycogen
4. maintaining body posture
How individual muscle fibers generate ATP - ✔✔1. glycolysis (anaerobic respiration)
Katelyn Whitman, All Rights Reserved © 2025 2
, 2. hydrolysis of creatine phosphate
3. krebs cycle/electron transport chain (aerobic respiration)
actin,myosin - ✔✔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) - ✔✔1. Skeletal Muscle
2. Fascicle
3. Muscle Fiber (cell)
4. Myofibrol
5. Filaments
Sarcolemma - ✔✔cell membrane of individual muscle cell
Origin - ✔✔the attachment to the stationary bone (bone that does not move) Proximal
Insertion - ✔✔the attachment to the movable bone (distal)
Fulcrum - ✔✔elbow joint
Effort - ✔✔amount of force
ex: contraction of biceps brachii
Load - ✔✔weight of object plus forearm (resistance)
Katelyn Whitman, All Rights Reserved © 2025 3
Questions and Answers 100% Pass
Muscle Tissue Property: Electrical Excitability - ✔✔ions are charged molecules that
have different concentrations between a semipermeable membrane
Muscular Tissue Property: Contractility - ✔✔the ability to forcefully contract
Muscular Tissue Property: Extensibility - ✔✔the ability to stretch
Muscular Tissue Property: Elasticity - ✔✔the ability to return to your original shape
Microscopic Anatomy of a Skeletal Muscle Fiber - ✔✔-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 - ✔✔-myosin pulls on actin,
causing thin filament to slide forward
-consequently, Z discs move toward each other and the sarcomere shortens
Katelyn Whitman, All Rights Reserved © 2025 1
,-thanks to structural proteins, there is a transmission of force throughout the entire
muscle
***Filaments do not change in length
Isotonic - ✔✔tension is constant while muscle length changes
-concentric=picking up book
-eccentric=lowering book
Isometric - ✔✔muscle contracts but does not change length
-holding a book out steady
actin - ✔✔During active muscle contraction, myosin heads bind to the protein
_______________.
calcium - ✔✔________________ is released from the sarcoplasmic reticulum and plays a
key role in active muscle contraction
Functions of Skeletal System - ✔✔1. facillitating movement
2. generating heat (thermogenesis)
3. Storing glycogen
4. maintaining body posture
How individual muscle fibers generate ATP - ✔✔1. glycolysis (anaerobic respiration)
Katelyn Whitman, All Rights Reserved © 2025 2
, 2. hydrolysis of creatine phosphate
3. krebs cycle/electron transport chain (aerobic respiration)
actin,myosin - ✔✔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) - ✔✔1. Skeletal Muscle
2. Fascicle
3. Muscle Fiber (cell)
4. Myofibrol
5. Filaments
Sarcolemma - ✔✔cell membrane of individual muscle cell
Origin - ✔✔the attachment to the stationary bone (bone that does not move) Proximal
Insertion - ✔✔the attachment to the movable bone (distal)
Fulcrum - ✔✔elbow joint
Effort - ✔✔amount of force
ex: contraction of biceps brachii
Load - ✔✔weight of object plus forearm (resistance)
Katelyn Whitman, All Rights Reserved © 2025 3
