KINESIOLOGY 350 EXAM ONE STUDY
GUIDE PSU NADER QUESTIONS AND
100% VERIFIED ANSWERS
\.Epimysium - ANSWERS✔-Surrounds entire muscle
\.Perimysium - ANSWERS✔-Surrounds muscle fascicle
\.Endomysium - ANSWERS✔-Surrounds muscle fiber
\.Plasmalemma function - ANSWERS✔-Conduction of AP
\.Helper cell of plasmalemma - ANSWERS✔-Satellite cells
\.Satellite cells - ANSWERS✔-Help growth and development of new cells (injury recovery)
\.Sarcoplasm - ANSWERS✔-Stores proteins, fats, glycogen, and myoglobin
\.T-tubules - ANSWERS✔-sends impulses to myofibrils and will allow substances in and waste
out
\.Sarcoplasmic Reticulum - ANSWERS✔-Calcium storage (release and re-uptake)
, \.What is a motor unit? - ANSWERS✔-A motor neurons and all the muscle fibers it innervates
\.Sarcomere - ANSWERS✔-Z-disk to Z-disk
\.H-zone - ANSWERS✔-Myosin only
Contracted: Shortens
contains M-line
\.I-band - ANSWERS✔-Actin portion (light); Shortens when contracted
\.A-Band - ANSWERS✔-Dark band; stays the same length when contracted
Actin and Myosin present
\.Excitation-Contraction coupling 6 steps - ANSWERS✔-1) Nerve impulse or AP from brain/spinal
cord reaches a Alpha-motor neuron's dendrites
2) AP travels down axon; reaches axon terminal; releases NT (Ach)
3) Ach travels across the synaptic cleft and reaches the post synaptic receptors on plasmalemma
4)AP travels down plasmalemma to/through t-tubules; triggers Sodium to enter cell
(depolarization)
5) AP (electrical charge) after reaching t-tubules contacts SR; which releases Calcium into
sarcoplasm
6) Calcium binds to troponin C (on actin); causes the active binding site to become exposed on
tropomyosin
\.Sliding filament theory - ANSWERS✔-1) Cross bridge activation
2) Myosin head exposed to active binding site on activ
3) myosin head tilts to 45 degree angle and pulls actin toward sarcomere center (power stroke)
GUIDE PSU NADER QUESTIONS AND
100% VERIFIED ANSWERS
\.Epimysium - ANSWERS✔-Surrounds entire muscle
\.Perimysium - ANSWERS✔-Surrounds muscle fascicle
\.Endomysium - ANSWERS✔-Surrounds muscle fiber
\.Plasmalemma function - ANSWERS✔-Conduction of AP
\.Helper cell of plasmalemma - ANSWERS✔-Satellite cells
\.Satellite cells - ANSWERS✔-Help growth and development of new cells (injury recovery)
\.Sarcoplasm - ANSWERS✔-Stores proteins, fats, glycogen, and myoglobin
\.T-tubules - ANSWERS✔-sends impulses to myofibrils and will allow substances in and waste
out
\.Sarcoplasmic Reticulum - ANSWERS✔-Calcium storage (release and re-uptake)
, \.What is a motor unit? - ANSWERS✔-A motor neurons and all the muscle fibers it innervates
\.Sarcomere - ANSWERS✔-Z-disk to Z-disk
\.H-zone - ANSWERS✔-Myosin only
Contracted: Shortens
contains M-line
\.I-band - ANSWERS✔-Actin portion (light); Shortens when contracted
\.A-Band - ANSWERS✔-Dark band; stays the same length when contracted
Actin and Myosin present
\.Excitation-Contraction coupling 6 steps - ANSWERS✔-1) Nerve impulse or AP from brain/spinal
cord reaches a Alpha-motor neuron's dendrites
2) AP travels down axon; reaches axon terminal; releases NT (Ach)
3) Ach travels across the synaptic cleft and reaches the post synaptic receptors on plasmalemma
4)AP travels down plasmalemma to/through t-tubules; triggers Sodium to enter cell
(depolarization)
5) AP (electrical charge) after reaching t-tubules contacts SR; which releases Calcium into
sarcoplasm
6) Calcium binds to troponin C (on actin); causes the active binding site to become exposed on
tropomyosin
\.Sliding filament theory - ANSWERS✔-1) Cross bridge activation
2) Myosin head exposed to active binding site on activ
3) myosin head tilts to 45 degree angle and pulls actin toward sarcomere center (power stroke)
