Quiz #7 Bonin
A single muscle contraction lasting a fraction of a second is called summation
False
Creatine Phosphate binds oxygen for use in making ATP and is stored in muscle tissue.
False
Myofibrils make up the microfilaments.
False
A neuromuscular junction is where a __ and a myofibril come together and connect. __ is released from the axon terminal and binds with a receptor on the __.
Neuron; acetylcholine; sarcolemma
Produces heat by ATP breakdown
Skeletal muscle
The greater the intensity of stimulation a muscle receives and the more motor units are activated in a muscle response are called:
recruitment
cell membrane
sarcolemma
excitable; carries an action potential
sarcolemma
cytoplasm
sarcoplasm
smooth endoplasmic reticulum
sarcoplasmic reticulum
stores Ca++
sarcoplasmic reticulum
voluntary
skeletal muscle
located in hollow organs of digestive tract
smooth muscle
no sarcomeres
smooth muscle
non-striated
smooth muscle
spindle-shaped
smooth muscle
Creatine Phosphate functions in the muscle cell by:
storing energy that will be transferred to ADP to resynthesize ATP
A tendon is an extension of the muscle's connective tissue. Tendons attach muscle to the surrounding muscle
first statement is true only
Which is not a function of skeletal muscles?
move food through our hollow organs
skeletal muscle
multi-nucleated
Another correct term for a muscle cell is:
muscle fiber
The striations in muscle tissue are caused by the "overlapping" of:
myofilaments
The __ molecule has two heads that resemble two golf clubs twisted around themselves. It binds to the exposed site on actin.
myosin
What are the three connective tissue classifications that divide muscle, cover it, and eventually all merge together to become fascia and tendons?
**(All of the above) endomysium, epimysium, perimysium
What is ATP used for in muscle contractions?
**(All of the above) myosin's "power stroke", release of myosin from actin after contraction, returns Ca++ to Sarcoplasmic reticulum
A sustained muscle contraction with no relaxation is called tetany.
True
intercalated discs
cardiac muscle
intrinsic nervous stimulation
cardiac muscle
What is the role of myoglobin in muscle contraction?
oxygen carrier for cellular respiration found in the muscle
Which of the following connective tissues surround a muscle fascicle?
perimysium
two SR cisternae and a T-Tubule
triad
The critical role Ca++ plays in muscle contractions is to bind with __ on actin, exposing a binding cite. The globular heads of __ can now cross-link with actin and ADP is released.
troponin; myosin
