during a contraction, muscles are first....
what are skeletal muscle groups that work together to create the same movement called?
stimulation of acetylcholine release cause skeletal muscles to become?
to generate an electric impulse
In order for a muscle contraction to occur, cross bridges must form between...
thin and thick filaments
For a skeletal muscle to contract, what must occur?
it must be activated by a nerve and
have the presence of calcium
when an electrical impulse traveling along a motor neuron arrives at a neuromuscular junction what happens?
acetycholine is released from the nerve terminal
the primary energy source used by muscle cells to generate ATP is?
isotonic muscle contractions occur when?
a muscle shortens while maintaining a constant force.
During a marathon, runners will use of ATP and glucose early in the race. which energy source is generally used next for producing ATP?
At the end of the contractile period, energy from the breakdown of ATP is used to?
transport calcium back into the sarcoplasmic reticulium so the relaxation can occur.
T, or transverse, tubes in skeletal muscle function to...
to store ionic calcium
what is a characteristic of an isotonic muscle contraction but not an isometric muscle contraction.
isometric do not cause muscle movement. isotonic does
give me examples of isotonic contractions
lifting light or heavy objects
after intense exercise, your body attempts to overcome oxygen debt by what?
your body takes in excess oxygen.
after electrical stimulation of a muscle cell, calcium functions to...
diffuses into the cell cytoplasm and then comes in contact with the myofibrils where it sets in motion a chain of events that leads to contraction.
a myogram is a recording of what?
of muscle activity
which muscles would one expect to find motor units made up of only a few muscle cells?
where fine control is essential.
fast twitch fibers tend to rely on what for quick bursts of energy?
creatine phosphate and anaerobic metabalism
what increases in the body as a result of aerobic training?
what are the differences between smooth and cardiac muscle?
the cardiac muscles surround the heart. smooth muscle covers other areas like ducts, tubes and cavities of your digestive, urinary, respiratory and genital systems. Smooth muscle is also found in the skin and eyeball.
during aerobic exercise the target heart rate should be maintained for at least how many minutes in order to train the body?
what are the differences between all three muscle types?
cardiac has striated appearance
smooth muscle has no striations
cardiac and smooth muscles are involuntary and are able to contract on their own.
muscle soreness that occurs after jogging down a hill results from what?
release of lactic acid.
intercalated discs contain what?
what do anabolic steroids do to your body?
to increase muscle mass, and muscle strength, it can cause a lot of negative things to happen as well. it increases your risk of heart attack or stroke. and severe liver disease.