Sarcomere Structure
This structure anchors actin filaments at the end of a sarcomere.
What is the Z disc?
This is what myosin heads form between actin and myosin.
What are cross-bridges?
The electrical signal that travels along the sarcolemma.
What is action potential?
The most contractile unit of the muscle.
What are sarcomeres?
A muscle is named gluteus maximus.
What muscle naming classifications are represented in this name?
What is the location (gluteal region) and relative size (maximus—largest)?
The region containing only thick filaments.
What is the H zone?
The molecule directly responsible for detaching myosin from actin.
What is ATP?
The structure that stores and releases calcium in muscle fibers.
What is sarcoplasmic reticulum?
Muscle fibers bundle together to form___
What are fascicles?
The two muscles that are named for the bone with which they are associated.
What are the temporalis and the frontalis?
The membrane of the muscle fiber is called the __________.
What is sarcolemma?
This ion binds to troponin, causing tropomyosin to move.
What is calcium (Ca²⁺)?
When the nerve impulse travels down the nerve ___ is released.
What is a neurotransmitter?
The organelle that makes up most of the muscle cells
What are myofibrils?
This muscle extends the wrist.
What is the extensor carpi ulnaris?
Two types of myofilaments are called _____ and _____.
What are myosin and actin?
The neurotransmitter is needed to initiate a muscle contraction.
What is acetylcholine?
The region where a motor neuron comes into close contact with the skeletal muscle.
What is a neuromuscular junction?
Three types of connective tissue of a skeletal muscle.
What are epimysium, perimysium, and endomysium?
This powerful calf muscle helps you walk, run, and jump by flexing the foot at the ankle.
What is gastrocnemius?
Actin makes up _ bands and myosin makes up _ bands.
What are I and A bands?
This is what happens to these ions when the action potential has finished.
Immediately reabsorbs into the storage area, and the muscle cell relaxes and settles back to its original length.
Two ways the cell can return to its resting state.
1). Diffusion of potassium ions out of the cell
2). Activation of the sodium-potassium pump
This is what the three connective tissues do as a whole.
Wrap around different parts of the muscle to support it.
Bonus: The origin and insertion of the sternocleidomastoid.
What are the sternum and clavicle (origin) and the mastoid process of the temporal bone (insertion)?