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24 Cards in this Set

  • Front
  • Back
The light bands in skeletal muscle are composed of ______ and the dark bands are composed of _____.
actin, myosin
The release of this substance from the sarcoplasmic reticulum causes the filaments within the sarcomeres to slide past one another.
calcium
_________ is a protein that winds about an actin filament covering the binding sites for myosin
Tropomyosin
The quickest method of providing ATP for muscle activity is:
creatine phosphate conversion
Another name for amyotrophic lateral sclerosis is _____________.
Lou Gehrig's Disease
When calcium ions are released from the sarcoplasmic reticulum, they combine with the protein _________.
troponin
A CSI agent finds a body in which rigor mortis has ceased. She concludes that the person has been dead for over ____ hours.
24
The smooth endoplasmic reticulum that is involved in the storage of calcium is known as the:
sarcoplasmic reticula
The contractile elements inside muscle cells are grouped into structures called:
myofibrils
The striations observed in skeletal and cardiac muscles are produced by:
alternating A bands and I bands
The functions of the skeletal muscles include:

supporting the body and protecting internal organs
providing movement and stabilizing joints
maintaining a constant body temperature
assisting movement in the cardiovascular and lymphatic systems
all of the above responses are correct
all of the above
Many insecticides and chemical weapons are effective because they contain an enzyme called acetylcholinesterase that inhibits the neurotransmitter called ________.
acetylcholine
A muscle fiber contains many contractile portions called _____ that run the length of a muscle fiber.
myofibrils
According to the sliding filament theory, myosin filaments pull actin filaments by means of _________.
cross-bridges
The basic muscle tissues found in humans include

smooth muscle
cardiac muscle
skeletal muscle
All of the choices are correct
all of the choices are correct
According to the sliding filament theory, a sarcomere
gets shorter when it contracts
Identify the incorrect statement.

Cardiac muscle is found in the heart.
Smooth muscle can be found in the muscles of the arm.
Skeletal muscle can be found in the arms and legs.
Smooth muscle lines blood vessels.
All of the statements are correct.
Smooth muscle can be found in the muscles of the arm
When Laura looked at the steak she noticed components of the muscle that she learned in her anatomy class called _______
Fascicles
The contractile unit of a muscle fiber is called a:
sarcomere
In a muscle fiber, the sarcolemma forms the _______.
T tubules
The sarcomere extends between two dark lines called the ________ lines
Z
_________ is a neurotransmitter that triggers muscle contraction
Acetylcholine
Michelle was receiving Botox injections for her wrinkles. Botox works by ___.
preventing release of ACH
The gangster movies call a dead person a stiff, rigor mortis is the proper name. How does this occur?
Without ATP, muscles remain fixed in their last state of contraction