Properties, Functions, and Connective Tissue
The definition of excitability.
These structures convey electrical impulses for muscle contraction.
What are transverse tubules?
This neurotransmitter is released by the motor neuron and binds to receptors on the motor end plate.
What is acetylcholine (ACh)?
The definition of contractility.
The functional contractile unit of a skeletal muscle.
What is a sarcomere?
Tropomyosin binds to this myofilament and blocks active sites.
What is actin?
Examples of muscle motion (name 3).
What is locomotion (skeletal movement), movement of fluids, transportation of blood, churning food, releasing bile, and expelling urine?
These two structures store and release calcium upon input.
What are terminal cisternae and the sarcoplasmic reticulum?
This controls tropomyosin and binds to calcium.
What is troponin?
The order of muscle layers (from superficial to what is around each muscle fiber).
What is superficial fascia, deep fascia, epimysium, perimysium, and endomysium?
This section contains thick filaments, M-line, and the zone of overlap.
What is the A Band?
These are needed for muscle contraction to persist.
What is calcium and ATP?
The functions of muscle.
What is motion, maintenance of body position, thermogenesis, support of soft tissue, and guarding of entrances and exits of the body (sphincters)?
The width of these remain constant during muscle contraction.
What are A bands?
The correct order of muscle contraction:
1. In the presence of ATP, myosin pulls actin toward center of sarcomere.
2. When stimulation ceases, calcium ion channels close and calcium is pumped back into sarcoplasmic reticulum.
3. A nerve impulse causes vesicles to release ACh into the synaptic cleft.
4. Spread of the impulse down T-tubules causes ion channels to open in the terminal cisternae.
5. Calcium ions bind to troponin, and troponin changes shape.
6. Calcium ions diffuse from terminal cisternae into the sarcoplasm of the muscle fiber.
What is 3, 4, 6, 5, 1, 2?