a connective tissue on the surface of muscles (that extends onto the tendon and bone) is known as ...
One of the characteristics of muscle tissue is that is has conductivity. Which of the following best describes this characteristic?
Muscles have local electrical charges that are capable of moving along the muscle fiber.
One of the characteristics of muscle tissue is that is has extensibility. Which of the following best describes this characteristic?
muscles can be stretched when needed
One of the characteristics of muscle tissue is that is has excitability. Which of the following best describes this characteristic?
muscles contract when stimulated
which of the following groups are considered to be parts of the series-elastic components of muscle?
endomysium, perimysium, epimysium, fascia, and tendons
which of the following best describes the function of the series-elastic component of muscle?
these are not excitable or contractile, but are extensible and elastic
the sytoplasm within the muscle fiber contains a molecule to distribute oxygen within the cell. this molecule is known as...
the molecule within the cytoplasm of a muscle fiber that supplies quick energy for contradiction is ...
THE MYOFILAMENTS WITHIN THE MUSCLE FIBER ARE COMPOSED OF THREE ITNTEGRAL ITEMS. WHICH OF THE FOLLOWING LISTS THE COMPONENTS CORRECTLY?
myosin, actin, and elastic (titin) filament
in the myofibril, ATP is used for which of the following?
muscle tone, muscle contraction, muscle relaxation
objects that move through organs that are surrounded by smooth muscle are often moved by means of ...
the "all-or-none" concept of skeletal muscle contradiction means that ...
muscle fibers contract completely
which of the following best describes the use of the muscle tone in the body?
keeps our backs straight and our heads up
actions potential frequency is best described as ...
the number of action potential produced per unit of time.
when acetylcholine is broken down by acyetylcholinesterasne in the synaptic cleft, what happens to choline?
it is reabsorbed at the presynaptic terminal and combines with mer acetic acid to make acetylcholine.
the recovery stroke in a muscle contraction involves which of the following?
return of the myosin head to its original position after the cross bridge releases.
which of the following muscles is involuntary and is the most widely found throughout the body?
which of the following muscle types contain peripherally located, multiple nuclei in its cells?
the striations in striated muscle correspond with actual molecular structures. which of the following is the z line?
an attatchment point for actin molecules
which of the following best describes a muscle motor unit?
one nerve fiber and all the muscle fibers innervated by that nerve
the change in electrical potential caused by shifts in ions across the membrane is known as ...
during an action potential, calcium un released into the sarcoplasm. which of the following is the best explanation of what the calcium does?
removes the tropomyosin block
when the myosin head flexes into a bend, pulling the thin filament along with it, this is called the ...
when the thick and the thin filaments pull together, which of the following is TRUE?
the sarcomere gets shorter
intercalated discs are capable of doing which of the following?
pass electrical stimulation to toher cardiac cells
which of the following is TRUE of cardiac tissue?
it has abundant glycogen and myoglobin and is aerobic
when neuron stimulates a muscle fiber, what molecule diffuses across the gap between them?
muscle fibers and neurons are called electrically excitable cells because ...
their plasma membranes exhibit voltage changes in response to stimulation
movement of which of the following proteins causes exposure of the active sites on the actin molecule?
binding of acetylcholine with its receptor on muscle cells causes ...
opening of ligan-gated sodium channel
which of the following assures quick removal of neurotransmitter at the junction between a nerve and a muscle?
a buildup of acetycholine in the synaptic cleft without breakdown may cause which of the following?
in a muscle twitch, which of the following represents the time between application of a stimulus and the beginning of contraction?
which of the following determines the height of the peaks in multiple motor until summation?
the amounf of tension produced by the number of motor units responding
which of the following would represent incomplete tetanus?
multiple contractions with slight relaxation
which of the following explains why treppe takes place in muscle contractions?
increased calcium levels around the myofibrils
which of the following is true of an isometric muscle contraction?
the amount of tensions increases during contraction
all of the following are TRUE of muscle tone except ...
depends on multiple motor units contracting in phase with each other
smooth body movements result from ...
both incomplete and complete titanic contractions of motor units contracting out of phase with each other.
active tension in a muscle is defined as ...
the tension applied to a load when the muscle contracts
which of the following types of fatigue is caused by the release of more acrtylcholine than can be produced to replace it?
muscle soreness can be produced by which of the following?
muscular fatigue, enzymes in the extracellular fluid commonly found within muscle, collagen in the extracellular fluid
which of the following represents extreme muscular fatigue when the muscle is incapable of either contracting or relaxing?
which of the following energy storages source is most commonly used during the first 10 seconds of exercise?
which of the following represents the amount of oxygen that is necessary for the body to recover from anaerobic respiration?
which of the following is true about distribution of fast and slow twitch fibers in the body?
slow twitch fibers are usually more resistant to fatigue
which of the following effects of exercise elevate the body temperature?
elevated metabolism from the oxygen debt, vasodilation of blood vessels in the skin, skeletal muscle contractions
unitary smooth muscle is found in which of the following locations in the body?
digestive tract, reproductive tract, urinary tract
which of the following is true about the smooth muscle?
the resting membrane potential is less negative in skeletal muscle
which of the following are the most common neurotransmitters in smooth muscle?
acetylcholine and norepinephrine
all of the following are properties of cardiac muscle cells except ...
shorter in duration of contraction than skeletal muscle