Muscle Actions
Which muscle is responsible for puckering movement of the lips (whistling, kissing, etc)
Buccinator
What enters the neuron allowing ACh to be released into the neuromuscular junction?
Calcium
What is the area of the sarcomere that does not change in length during a contraction and consists of the entire length of myosin?
A band
What is the progressive muscle-wasting disease that occurs with age? What can slow it down?
Sarcopenia; exercise, especially weight-bearing exercise
What is circular muscle that guards passage of materials into or out of an organ?
Sphincter
Which muscles elevate the ribs when we breathe in?
External intercostals
What binds to the sodium ligand-gated channels to cause a muscle action potential?
Acetyl Choline
Which two regions of sarcomere completely disappear during a full contraction?
I band and H zone
Which type of muscle has the most mitochondria?
Cardiac
Which functional type of muscle strengthens what an agonist contracts?
An antagonist
Which muscle extends the elbow?
Triceps brachii
ATP hydrolyzes and Mysoin heads get ready, they bind to the myosin binding sites on actin, power stroke occurs, ATP binds back on myosin head and myosin releases from actin
What is the regulatory protein on the thin filament that calcium binds to before a contraction called?
Troponin
What is the energy-storing protein in muscles that quickly generates ATP?
Myoglobin
Which type of lever system is most common in the body?
Third class levers
Which three muscles adduct the leg?
Adductor longus, gracilis, adductor magnus
After a contraction, Calcium is pumped back into the sarcoplasmic reticulum via ________
ATPase pumps
What is found on the myosin binding sites on actin that prevent myosin from binding when there is no signal?
Tropomyosin
Eccentric
When a muscle contracts, it pulls the _____ to the ______
Insertion; origin
Which muscles make up the hamstrings?
Biceps femoris, semitendinosus, semimembranosus
What happens during the latent period of muscle contraction?
Calcium is being released from the sarcoplasmic reticulum
Which structural protein connects Z disc to M line?
Titin
Which type of muscle fibers are used for short-term high intensity tasks like hitting a tennis ball?
Fast glycolytic fibers
What is muscle wasting called?
Atrophy