Myofilament
What are the two types on myofilament?
Actin and Myosin
What are thick myofilaments?
myosin
Cells are made of smaller parts called?
Organelles
What is muscles ability to shorten?
Contractility
What is the electrical impulse that travels through motor neurons?
Action Potential
Myofilaments make up what?
Sarcomere
What are thin myofilaments?
actin
What is the Individual proteins that make up a muscle fiber?
Myofibril
What is the muscle about to respond to stimuli (electricity)?
Excitability
Where is the binding site on the muscle fiber that recieve neurotransmitters?
Receptors
When a sarcomere contracts, what happens to myosin and actin?
myosin pulls actin towards the M-lines.
What is the boundary between sarcomeres?
What is the muscle fiber cell membrane?
Sarcolemma
what is the muscles ability to be stretched without tearing?
Extensibility
This contains only thin (actin) filaments, what is it?
I band
What stiffens and stabilizes actin?
Tropomyosin
What holds together Myosin myofilaments?
M line
What regulates levels of calcium ions in the muscle fiber?
Sarcoplamic Reticulum
What is the muscles ability to return to its original shape?
Elasisity
This part of the Sarcomere contains the entire length of a thick (myosin) filament, what is it?
A bands
What are the three subunits of Troponin?
actin, tropomyosin, and Calcium ions
This only contains thick (Myosin) filaments?
H zone
What allows electrical impulses to reach the deepest parts of the sarcoplasmic reticulum?
T-tubules
What allows a gymnast to do the splits?
Extensibility
What is the space between the axon terminal of a motor neuron and a muscle fiber?
Synaptic cleft