Name that muscle
This muscle is responsible for elbow flexion and forearm supination.
What are the biceps brachii?
Surrounded by endomysium, this is the functional unit of a muscle fiber that shortens during contraction.
What is a sarcomere?
This theory explains how muscles shorten to produce force.
What is the sliding filament theory?
These types of muscle tissue are striated.
What are skeletal and cardiac muscles?
When a drug blocks acetylcholinesterase (the enzyme responsible for breaking down ACh) at the neuromuscular junction, this is the immediate muscle response.
What is a sustained contraction (tetanus)?
This large muscle is responsible for the horizontal adduction of the arm.
What is the pectoralis major?
The thin and thick filaments of the sarcomere are also called.
What are actin and myosin filaments?
This energy molecule is required for myosin to bind to actin and for muscles to contract.
What is ATP?
The smooth and cardiac muscle groups.
What is Involuntary?
During exercise, this substance can build up and cause muscle fatigue.
What is lactic acid?
This muscle is responsible for the elevation and retraction of the scapula while extending the neck.
What is the trapezius?
This structure marks the boundary of each sarcomere.
What is the Z disc?
This regulatory protein blocks the actin binding sites when the muscle is relaxed.
What is Tropomyosin?
This structure is the plasma membrane of a muscle fiber.
What is the sarcolemma?
A rapid change in membrane potential that spreads down a neuron or muscle cell to signal action.
What is an action potential?
This muscle is responsible for the dorsiflexion and inversion of the foot.
What is the tibialis anterior?
During muscle contraction, this band shortens while the A band remains the same length.
What is the I band?
This organelle in the myofibril is responsible for releasing Ca2+ to initiate contraction.
What is the sarcoplasmic reticulum?
This structure allows cardiac muscle cells to electrically and mechanically connect, ensuring coordinated heart contractions.
What are intercalated disks?
2 ways graded muscle contractions can be produced.
What is changing the frequency of stimulation and changing the number of motor units?
This muscle flexes the hip and stabilizes the lumbar spine.
What is the iliopsoas?
This region of the sarcomere disappears entirely during maximal muscle contraction.
What is the H zone?
This specific release from the myosin head triggers the power stroke.
What is the release of inorganic phosphate (Pi)?
This connective tissue layer surrounds bundles of muscle fibers called fascicles.
What is the perimysium?
This structure allows the action potential to rapidly travel deep into the muscle fiber.
What are T-tubules?