NWHSU Physiology I Class 13 Contractility of the Heart Questions And Answers
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Module
NWHSU
Institution
NWHSU
NWHSU Physiology I Class 13 Contractility
of the Heart Questions And Answers
Sympathetic Your heart rate is increasing during cardiovascular exercise. What nervous
system is primarily acting on the heart?
If the sympathetic nervous system acts on the heart the threshold potential will *decrea...
NWHSU Physiology I Class 13 Contractility
of the Heart Questions And Answers
Sympathetic Your heart rate is increasing during cardiovascular exercise. What nervous
system is primarily acting on the heart?
If the sympathetic nervous system acts on the heart the threshold potential will *decrease* and
your heart rate will *increase*. If the sympathetic nervous system acts on the heart the
threshold potential will (increase/decrease) and your heart rate will (increase/decrease).
If the parasympathetic nervous system acts on the heart the rate of depolarization will
*decrease*, Ca2+ conductance will *decrease*, the contractility of the heart will *decrease*, and
the threshold potential will *increase*. If the parasympathetic nervous system acts on the
heart the rate of depolarization will (increase/decrease), Ca2+ conductance will
(increase/decrease), the contractility of the heart will (increase/decrease), and the threshold
potential will (increase/decrease).
If the parasympathetic nervous system acts on the heart the threshold potential will *increase*
and your heart rate will *decrease*. If the parasympathetic nervous system acts on the
heart the threshold potential will (increase/decrease) and your heart rate will (increase/decrease).
, NWHSU Physiology I Class 13 Contractility
of the Heart Questions And Answers
Heart rate. If heart rate increases, contractility increases. Contractility is directly related to
what?
Intracellular calcium If you are experiencing an increase in heart rate and contractility, it
is occuring due to (intra/extra) cellular calcium
NE What neurotransmitter activates Beta 1 receptors?
Beta 1 receptors are coupled via to *G Protein* to *Adenylyl Cyclase*. Beta 1 receptors
are coupled via to ________________ to _________________.
In Beta 1 Receptors, activation of Adenylyl Cyclase (through the G protein) leads to the
production of *cyclic adenosine monophosphate (cAMP)* which activates *kinase protein*.
In Beta 1 Receptors, activation of Adenylyl Cyclase (through the G protein) leads to the
production of _____________________ which activates ____________________.
*Sympathetic NS*. Increased inflow of trigger Ca2+. What nervous system
phosphorylates the sacrolemmal Ca2 channels? What does this result in?
, NWHSU Physiology I Class 13 Contractility
of the Heart Questions And Answers
Sympathetic Nervous System What nervous system phosphylates phospholamban which
stimulates Ca2+ ATPase *resulting in greater uptake and storage of Ca2+*.
Increased uptake and storage of Ca2+ by SR What is the result of the Phosphorylation of
Phospholamban?
Sympathetic Nervous System What nervous system results in faster relaxation?
Sympathetic Nervous System What nervous system results in shorter contraction?
ACh What neurotransmitter is associated with M2 receptors and activates an inhibitory G
Protein?
Parasympathetic Nervous System What Nervous System is associated with a decrease in
inward Ca2+ current during plateau?
Parasympathetic Nervous System What Nervous System is associated with an increased
outward K+ flow?
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