Muscle Basics
This is the primary function of ALL muscles in the body.
Movement.
This connective tissue layer surrounds the entire muscle.
Epimysium
This ion is released from the sarcoplasmic reticulum and triggers contraction.
Calcium
This molecule provides the immediate energy used by muscle fibers.
ATP!!!
The immovable attachment point of a muscle is called this.
The Origin
Muscles generate this as a byproduct of contraction, helping maintain body temperature.
Heat.
Bundles of muscle fibers are called this.
Fascicles.
This neurotransmitter is released at the neuromuscular junction to stimulate muscle contraction.
Acetylcholine
This compound quickly regenerates ATP in muscle cells during short bursts of activity.
Creatine Phosphate.
The muscle primarily responsible for producing a specific movement.
The Agonist.
True or False:
Individual muscles are considered organs.
WHY?
True; They are made of different tissues.
This connective tissue layer surrounds each individual muscle fiber.
Endomysium
This structure forms when a myosin head attaches to actin during contraction.
A cross-bridge
This stores extra oxygen inside muscle tissue for quick access during exercise.
Myoglobin.
A motor neuron and all the muscle fibers it controls together form this functional unit of muscle contraction.
A motor unit.
This structural feature of skeletal muscle is produced by the highly organized alignment of actin and myosin filaments.
Striations.
This filament uses ATP to pull on the other filaments to shorten the sarcomere.
Thick/ Myosin Filament
This theory explains how actin filaments slide past myosin filaments to shorten the muscle.
Sliding Filament Theory
This condition occurs when oxygen is insufficient and lactic acid accumulates in muscle.
Oxygen Debt.
When a muscle increases contraction strength by activating additional motor units, this process is called this.
Recruitment.
Even when you are just sitting, this property of skeletal muscle continues to maintain posture.
Muscle Tone.
During contraction, this region of the sarcomere becomes smaller or may disappear entirely because only thick filaments are present there.
The H zone
Calcium triggers contraction by binding to this protein, which causes another protein to move and expose myosin binding sites on actin.
Troponin
These are the things that oxygen is needed for after intense exercise.
1)Regenerate ATP
2)Regenerate Creatine Phosphate
3)Breaking Down Lactic Acid
4) Replenishing Myoglobin
A plantar flexor: It inserts into the calcaneus.
Gastrocnemius.