Bio253 Final Exam – Questions With Objective
Solutions
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Practice questions for this set
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occurs when excess fluid collects in the space between the pleural
membranes. The fluid may need to be drained by inserting a needle to
relieve the pressure.
Choose an answer
Lab 1: EMG and Muscular
1 pleural effusion 2
Conditions
Factors that have been proposed physiological significance of
3 4
to explain muscle fatigue: FEV1/FVC ratio
Don't know?
Terms in this set (174)
Lab 1: EMG and Muscular ...
Conditions
,Ekectromyography A recording of the electrical activity of skeletal
(EMG) muscle at rest and during contraction.
Needle electrodes are inserted through the skin into
Intramuscular EMG
the muscle.
Surface EMG Electrodes are placed on the skin's surface.
A neuron and the muscle fibers it controls. Motor
A motor unit unit recruitment is one way to increase contractile
strength of a whole muscle.
a phenomenon is which contraction of an agonist
muscle leads to minor activity in the antagonist
Co-activation muscle. Coordination between agonist and
antagonist muscles are essential for a range of
movement. It helps to stabilize the joint.
signals are produced by the electrical stimulation of
a motor nerve supplying a muscle. muscle
Evoked EMG
contraction are initiated by an action potential in the
motor nerve fibers innervating the muscle.
sometimes called "prime movers" as they are the
Agonist muscles primary muscle responsible for generating
movement through their contraction.
control (or oppose) specific movement, ad return
Antagonist muscles
the muscle to its initial position.
Muscle Fatigue ...
, Adenosine thriphosphate (ATP) can be remade from
adenosine diphosphate (ADP) by the addition of a
phosphate group- this can occur by three pathways:
1. When enough O2 is present, pyruvate (from the
breakdown of fats, glycogen or glucose) can enter
the citric acid cycle and is broken down to CO2 and
H2O. This is known as aerobic glycolysis and it
generates large amounts of ATP through oxidative
phosphorylation (the electron transport chain).
Psychological causes of 2. If O2 supplies are insufficient, pyruvate cannot
fatigue enter the citric acid cycle and instead gets
converted to lactic acid in a process called
anaerobic glycolysis. This makes small amount of
ATP but does not require O2.
3. In resting muscle, some ATP transfers a phosphate
to creatine obtained through the circulation from
the liver, creating a store of phosphocreatine.
During intense exercise, phosphocreatine can be
used to resynthesize ATP, allowing contraction to
continue.
When ATP production fails to keep pace with ATP
usage, muscles contract less and less effectively.
Excessive accumulation of lactic acid and
associated H+, together with iconic imbalances also
contribute to muscle fatigue. The pH drop
associated with the lactic acid production may
Physiological causes of
cause fatigue and limits the usefulness of anaerobic
fatigue
mechanism for ATP production.
Some specialized muscle fibers are more resistant
to fatigue than others. Fore example, muscles may
have more mitochondria and hence a greater
capacity for oxidative metabolism, or they may have
greater stores of phosphocreatine.
Solutions
Save
Practice questions for this set
Learn 1 /7 Study with Learn
occurs when excess fluid collects in the space between the pleural
membranes. The fluid may need to be drained by inserting a needle to
relieve the pressure.
Choose an answer
Lab 1: EMG and Muscular
1 pleural effusion 2
Conditions
Factors that have been proposed physiological significance of
3 4
to explain muscle fatigue: FEV1/FVC ratio
Don't know?
Terms in this set (174)
Lab 1: EMG and Muscular ...
Conditions
,Ekectromyography A recording of the electrical activity of skeletal
(EMG) muscle at rest and during contraction.
Needle electrodes are inserted through the skin into
Intramuscular EMG
the muscle.
Surface EMG Electrodes are placed on the skin's surface.
A neuron and the muscle fibers it controls. Motor
A motor unit unit recruitment is one way to increase contractile
strength of a whole muscle.
a phenomenon is which contraction of an agonist
muscle leads to minor activity in the antagonist
Co-activation muscle. Coordination between agonist and
antagonist muscles are essential for a range of
movement. It helps to stabilize the joint.
signals are produced by the electrical stimulation of
a motor nerve supplying a muscle. muscle
Evoked EMG
contraction are initiated by an action potential in the
motor nerve fibers innervating the muscle.
sometimes called "prime movers" as they are the
Agonist muscles primary muscle responsible for generating
movement through their contraction.
control (or oppose) specific movement, ad return
Antagonist muscles
the muscle to its initial position.
Muscle Fatigue ...
, Adenosine thriphosphate (ATP) can be remade from
adenosine diphosphate (ADP) by the addition of a
phosphate group- this can occur by three pathways:
1. When enough O2 is present, pyruvate (from the
breakdown of fats, glycogen or glucose) can enter
the citric acid cycle and is broken down to CO2 and
H2O. This is known as aerobic glycolysis and it
generates large amounts of ATP through oxidative
phosphorylation (the electron transport chain).
Psychological causes of 2. If O2 supplies are insufficient, pyruvate cannot
fatigue enter the citric acid cycle and instead gets
converted to lactic acid in a process called
anaerobic glycolysis. This makes small amount of
ATP but does not require O2.
3. In resting muscle, some ATP transfers a phosphate
to creatine obtained through the circulation from
the liver, creating a store of phosphocreatine.
During intense exercise, phosphocreatine can be
used to resynthesize ATP, allowing contraction to
continue.
When ATP production fails to keep pace with ATP
usage, muscles contract less and less effectively.
Excessive accumulation of lactic acid and
associated H+, together with iconic imbalances also
contribute to muscle fatigue. The pH drop
associated with the lactic acid production may
Physiological causes of
cause fatigue and limits the usefulness of anaerobic
fatigue
mechanism for ATP production.
Some specialized muscle fibers are more resistant
to fatigue than others. Fore example, muscles may
have more mitochondria and hence a greater
capacity for oxidative metabolism, or they may have
greater stores of phosphocreatine.
