Exam 2 Pt 4 Flashcards
Synaptic Transmission
neurotransmitters are released by the axon terminal and bind to activate the receptors on the dendrites on another neuron
Excitation-Contraction Coupling (E-C Coupling)
Action potential in skeletal muscle caused by release of acetylcholine from somatic motor neuron
Action potential stimulates SR to release Calcium and trigger contraction
Calcium binds to troponin, pulls tropomysin away from myosin binding sites on actin
Cross-Bridge Cycle
Events of E-C expose myosin binding sites
Cocked myosin head attaches to actin forming a “cross-bridge”
Myosin head pulls actin toward the center of sarcomere
ATP attaches to myosin head causing it to release actin
ATP hydrolyzed to ADP, releasing energy and allowing myosin head to return back to cocked position
Method of development for long bones
Endochondral ossification
Method of development for short bones
Endochondral ossification
Method of development for irregular bones
Endochondral ossification
Method of development for flat bones
Intramembranous ossification
Characteristics of skeletal muscle
Voluntary
Striated
Not branched
Multinucleated
Function of glycosomes in skeletal muscle
Stored glycogen that provide glucose during muscle cell activity
Function of myoglobin
Red pigment that stores oxygen
Function of Sarcoplasmic Reticulum
Regulates the concentration of calcium ions in the cytoplasm of striated muscle cells
Function of T Tubles
Synchronization of calcium release
Define Sarcomere
A structural unit of a myofibril (between 2 Z disks)
Sarcomere features
A band
I band
H zone
M line
M line
Attachment site for think filaments
