Vocab & Characteristics
This characteristic of muscle means it can respond to a stimulus, usually from a neuron
What is excitability?
Muscles are made of bundles of muscle fibers called this
What is a fascicle?
This is the electrical signal that carries a message
What is the action potential?
This type of respiration makes more ATP but requires oxygen
What is aerobic respiration?
(must have word aerobic)
This muscle characteristic describes the ability to return to resting length after being stretched
What is elasticity?
This membrane surrounds each fascicle
What is the perimysium?
This type of cell carries an action potential to a muscle
What is a neuron?
This molecule is essential for preparing the myosin head for a power stroke and allowing it to detach from the actin
What is ATP?
These are the protein filaments that interact for muscle contraction- one thick, one thin
What are actin and myosin?
This structure stores calcium inside a muscle fiber
What is the sarcoplasmic reticulum?
This gap between neuron and muscle fiber allows neurotransmitters to diffuse across
What is the synaptic cleft?
What is the synapse?
This term describes when myosin heads attach to actin
What is a cross-bridge?
This connective tissue layer surrounds an entire muscle
This term refers to the long protein chains inside a muscle fiber that contain repeating sarcomeres
What are myofibrils?
This neurotransmitter carries an action potential across the synaptic cleft
What is acetylcholine (ACh)?
The release of this ion from the sarcoplasmic reticulum starts muscle contraction
What is calcium?
This is the functional unit of muscle, found between two Z-lines
What is a sarcomere?
These two proteins block the binding sites on actin until calcium binds
What are troponin and tropomyosin?
This ion rushes into the neuron terminal to trigger neurotransmitter release
What is calcium?
During a power stroke, this structure shortens
What is the sarcomere?