Muscle Basics
This general term refers to all contractile tissue.
What is muscle?
This voluntary, striped muscle tissue is attached to the skeletal system.
What is skeletal muscle?
These tiny structures inside each muscle fiber are made of repeating sarcomeres.
What are myofibrils?
Smooth muscle is also known by this name.
What is visceral muscle?
Cardiac muscle is found only in this organ.
What is the heart?
Muscles can do this to move bones, but they cannot push.
What is pull?
These structures attach muscles to bones.
What are tendons?
These repeating units make up myofibrils and are separated by Z lines.
What are sarcomeres?
Unlike skeletal muscle, smooth muscle lacks these stripes.
What are striations?
Cardiac muscle has this type of control: voluntary or involuntary.
What is involuntary control?
Movement occurs as muscles alternate between these two states.
What are contraction and relaxation?
This movement decreases the angle between two bones.
What is flexion?
These two proteins form the thick and thin filaments, respectively.
What are myosin and actin?
This term means the widening of blood vessels.
What is vasodilation?
These structures connect cardiac muscle fibers to one another.
What are intercalated discs?
In response to a nerve impulse, a contracting muscle becomes these two things.
What are shorter and thicker?
This movement increases the angle between two bones, straightening a joint.
What is extension?
This substance supplies the energy needed for muscle contraction.
What is ATP?
These rings of muscle act as valves that control the passage of materials.
What are sphincters?
This genetic disorder, which primarily affects boys, causes muscle fibers to degenerate.
What is Duchenne muscular dystrophy?
These are the three types of muscle tissue.
What are skeletal, smooth, and cardiac muscle?
These two attachment points connect a muscle to the stationary bone and movable bone, respectively.
What are the point of origin and point of insertion?
This structure stores calcium when a muscle is relaxed and releases it when stimulated.
What is the sarcoplasmic reticulum?
During asthma, smooth muscle in these passageways contracts.
What are the airways?
Duchenne muscular dystrophy is caused by a mutation in the gene for this protein.
What is dystrophin?