ANPH - Exam 1 Questions And 100% Correct Answers
(3) All muscle fibers are? - ANSWER excitable, extensible, elastic
Skeletal muscles - 3 layers - ANSWER epimysium - connects to tissues
perimysium
endomysium
Purpose of skeletal muscles (3) - ANSWER maintain posture
stabilizes joints
generates heat
Sarcolemma - ANSWER cell membrane
Saroplasm - ANSWER cytoplasm
Sarcoplasmic reticulum - ANSWER specialized smooth ER
Sarcomere - ANSWER functional unit of muscle fiber
Tropomyosin and Troponin - ANSWER regulatory protein
Myofibril - ANSWER long filament in the sarcoplasm (contain thin actin and myosin
filaments)
Skeletal muscle sliding filament theory - ANSWER 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? - ANSWER how many fibers are stimulated +
number of motor nerve fibers activated by the motor cortex
Concentric isotonic - ANSWER force > resistance
muscle shortens
Eccentric isotonic - ANSWER resistance > force
muscle lengthens
Hypotonia - ANSWER lack of tone
brain does not send enough impulses to the muscles
Hypertonia - ANSWER increased muscle tone
too much signals from the brain to the muscles
Slow twitch fibers - ANSWER need constant supply of oxidative blood
- burns thru slowly
Fast twitch - ANSWER - generates ADP
- burns thru quickly
Fast glycolytic - ANSWER tires quickly because it burns thru blood supply quickly
(3) All muscle fibers are? - ANSWER excitable, extensible, elastic
Skeletal muscles - 3 layers - ANSWER epimysium - connects to tissues
perimysium
endomysium
Purpose of skeletal muscles (3) - ANSWER maintain posture
stabilizes joints
generates heat
Sarcolemma - ANSWER cell membrane
Saroplasm - ANSWER cytoplasm
Sarcoplasmic reticulum - ANSWER specialized smooth ER
Sarcomere - ANSWER functional unit of muscle fiber
Tropomyosin and Troponin - ANSWER regulatory protein
Myofibril - ANSWER long filament in the sarcoplasm (contain thin actin and myosin
filaments)
Skeletal muscle sliding filament theory - ANSWER 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? - ANSWER how many fibers are stimulated +
number of motor nerve fibers activated by the motor cortex
Concentric isotonic - ANSWER force > resistance
muscle shortens
Eccentric isotonic - ANSWER resistance > force
muscle lengthens
Hypotonia - ANSWER lack of tone
brain does not send enough impulses to the muscles
Hypertonia - ANSWER increased muscle tone
too much signals from the brain to the muscles
Slow twitch fibers - ANSWER need constant supply of oxidative blood
- burns thru slowly
Fast twitch - ANSWER - generates ADP
- burns thru quickly
Fast glycolytic - ANSWER tires quickly because it burns thru blood supply quickly
