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Exercise Physiology Final (Test 3)

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true
the skeletal and circulatory systems both assist in maintenance of body temperature.
false
muscle cells are capable of mitosis (cell division)
nuclei
what do satellite cells contribute to damaged muscle that enables repair?
sarcoplasmic reticulum
the storage site for calcium in the skeletal muscle cell.
acetylcholine
the neurotransmitter released at the neuromuscular junction as the result of depolarization of neuron
tropomyosin
the protein covers binding sites on an actin molecule in a muscle at rest
number of active cross bridges
the factor that is primary determinant of force prodcution in a single skeletal muscle cell
myosin ATPase isoform
the biochemical property of skeletal that is the key factor that regulates contraction velocity (Vmax)
type 1
type of skeletal muscle fiber that contain the greatest number of mitochondria
type IIx
type of skeletal muscle fiber that has the greatest Vmax (contraction velocity)
placing the muscle in a starting position in which it is contracted slightly below its resting length
this would not contribute to increased force production in an entire muscle
type II skeletal cells
aging is associated with sarcopenia, and this process is most pronounced in ___
decreases
as movement speed increases, force prodcution ___.
myocardium
the muscular layer of the heart responsible for muscular contraction
systole
refers to ventricular contraction
diastole
refers to ventricular relaxtion
false
cardiac cells have satellite cells.
all of the above
which of the following effects does exercise have on myocardial infarction?
-reduces the chance of occurrence
-reduces the number of cardiac cells that die during ischemia
-increases survival rate
diastole
the part of the cardiac cycle affected to the greatest extent during exercise...
blood pressure
the force exerted by blood on the arterial walls.
q= hr x sv
the equation for cardiac output
kidneys
the organ responsible for the long term regulation of blood pressure
SA node
considered the pacemaker of the heart
atrial depolorization
reflected in the P wave of an ECG
ventricular depolarization and atrial repolarization
reflected in the QRS complex of an ECG.
ventricular repolarization
reflected in the T wave of an ECG.
acetylcholine; decrease
neurons of the parasympathetic nervous system release __ at its nerve terminals on the SA node __ heart rate.
removal of parasympathetic input
change in nervous system outflow that is responsible for the initial increase of exercise.
false
trained and untrained females have similar resting cardiac ouptuts
increase
according to the Frank-Starling law of the heart, an increase in end-diastolic volume will __ the force of contraction and thus volume of blood pumped by the heart per beat
stroke volume
the amount of blood pumped by the heart per beat
false
elevated mean arterial pressure will increase stroke volume.
true
the intensity of exercises decreases the amount of vasodilation and blood flow to active muscle.
double product
indicates the metabolic demand placed on the heart
false
leg exercise elicits higher heart rates and blood pressures than arm exercise
SV decreases and HR increases
accurately describes how cardiac output is maintained during prolonged sub maximal at a fixed intensity
false
pulmonary respiration and cellular respiration refer to the same process
alveoli
part of respiratory system where actual gas exchange occurs
diaphragm
during normal quiet breathing at rest, inspiration is driven primarily by the...
false
at rest, expiration is an active muscular process.
constant
the most accurate description of the frequency of airway resting COPD
tidal volume
the lung volume that represents the amount of air inhaled or exhaled in 1 normal breath
vital capacity
lung volume that represents the amount of air that can be forcefully exhaled following a maximal test. (expiratory reserve volume + tidal volume + inspiratory reserve volume)
pulmonary ventilation
refers the movement of air into and out of the lungs.
tennis court
estimated that the total lung surface of lung is approximately the size of a ___.