©NINJANERD 2024/2025. YEAR PUBLISHED 2024.
ANPH - Exam 1 Questions and Answers
100% Solved
(3) All muscle fibers are? - ✔✔excitable, extensible, elastic
Skeletal muscles - 3 layers - ✔✔epimysium - connects to tissues
perimysium
endomysium
Purpose of skeletal muscles (3) - ✔✔maintain posture
stabilizes joints
generates heat
Sarcolemma - ✔✔cell membrane
Saroplasm - ✔✔cytoplasm
Sarcoplasmic reticulum - ✔✔specialized smooth ER
Sarcomere - ✔✔functional unit of muscle fiber
Tropomyosin and Troponin - ✔✔regulatory protein
Myofibril - ✔✔long filament in the sarcoplasm (contain thin actin and
myosin filaments)
, ©NINJANERD 2024/2025. YEAR PUBLISHED 2024.
Skeletal muscle sliding filament theory - ✔✔1. myosin head splits ATP
2. Myosin head attaches to actin = crossbridges
3. Myosin head pulls to sarcomere center
4. Crossbridges detach
Muscle strength is determined by what? - ✔✔how many fibers are
stimulated + number of motor nerve fibers activated by the motor cortex
Concentric isotonic - ✔✔force > resistance
muscle shortens
Eccentric isotonic - ✔✔resistance > force
muscle lengthens
Hypotonia - ✔✔lack of tone
brain does not send enough impulses to the muscles
Hypertonia - ✔✔increased muscle tone
too much signals from the brain to the muscles
Slow twitch fibers - ✔✔need constant supply of oxidative blood
- burns thru slowly
Fast twitch - ✔✔- generates ADP
- burns thru quickly
Fast glycolytic - ✔✔tires quickly because it burns thru blood supply quickly
ANPH - Exam 1 Questions and Answers
100% Solved
(3) All muscle fibers are? - ✔✔excitable, extensible, elastic
Skeletal muscles - 3 layers - ✔✔epimysium - connects to tissues
perimysium
endomysium
Purpose of skeletal muscles (3) - ✔✔maintain posture
stabilizes joints
generates heat
Sarcolemma - ✔✔cell membrane
Saroplasm - ✔✔cytoplasm
Sarcoplasmic reticulum - ✔✔specialized smooth ER
Sarcomere - ✔✔functional unit of muscle fiber
Tropomyosin and Troponin - ✔✔regulatory protein
Myofibril - ✔✔long filament in the sarcoplasm (contain thin actin and
myosin filaments)
, ©NINJANERD 2024/2025. YEAR PUBLISHED 2024.
Skeletal muscle sliding filament theory - ✔✔1. myosin head splits ATP
2. Myosin head attaches to actin = crossbridges
3. Myosin head pulls to sarcomere center
4. Crossbridges detach
Muscle strength is determined by what? - ✔✔how many fibers are
stimulated + number of motor nerve fibers activated by the motor cortex
Concentric isotonic - ✔✔force > resistance
muscle shortens
Eccentric isotonic - ✔✔resistance > force
muscle lengthens
Hypotonia - ✔✔lack of tone
brain does not send enough impulses to the muscles
Hypertonia - ✔✔increased muscle tone
too much signals from the brain to the muscles
Slow twitch fibers - ✔✔need constant supply of oxidative blood
- burns thru slowly
Fast twitch - ✔✔- generates ADP
- burns thru quickly
Fast glycolytic - ✔✔tires quickly because it burns thru blood supply quickly
