EXAM 1 SYSTEMS PHYS Questions and
Answers A+ Guide
What do myosin heads interact with in skeletal muscle? - correct
answers✅✅filamentous actin
In smooth muscle, activation of myosin light chain kinase
results in which of the following? - correct answers✅✅active
crossbridge cycling
Which of the following structures directly releases calcium
from the sarcoplasmic reticulum in skeletal muscle? - correct
answers✅✅ryanodine receptor
Which of the following directly activates myosin light chain
kinase in smooth muscle? - correct answers✅✅Ca2+-
calmodulin
Which of the following accurately describes one step in excitation-
contraction coupling in skeletal muscle? - correct
answers✅✅Movement of a voltage sensor in the t-tubule opens
a Ca2+
channel
In the skeletal muscle crossbridge cycle, the cycle stops and rigor
sets in unless which one of the following is present? - correct
answers✅✅ATP
, EXAM 1 SYSTEMS PHYS Questions and
Answers A+ Guide
Force of a skeletal muscle can be modulated
(physiologically or experimentally) by which of the following? -
correct answers✅✅All of the above
Which one of the following would you expect in the leg
muscles of a highly trained 100 meter runner? - correct
answers✅✅Fast myosin ATPase rate, low mitochondrial content,
low
capillary density, high glycolytic capacity
Troponin T is often used as a serum marker of a myocardial
infarction. Which one of the below statements best describes the
function of troponin T in skeletal muscle? - correct
answers✅✅Involved in exposing the myosin binding site on
actin
Which describes calcium mobilization in smooth muscle? -
correct answers✅✅Involves influx of Ca2+ from extracellular
space and release
of Ca2+ from sarcoplasmic reticulum
preganglionic neuron: para - correct answers✅✅long
Synapse with postganglionic
Answers A+ Guide
What do myosin heads interact with in skeletal muscle? - correct
answers✅✅filamentous actin
In smooth muscle, activation of myosin light chain kinase
results in which of the following? - correct answers✅✅active
crossbridge cycling
Which of the following structures directly releases calcium
from the sarcoplasmic reticulum in skeletal muscle? - correct
answers✅✅ryanodine receptor
Which of the following directly activates myosin light chain
kinase in smooth muscle? - correct answers✅✅Ca2+-
calmodulin
Which of the following accurately describes one step in excitation-
contraction coupling in skeletal muscle? - correct
answers✅✅Movement of a voltage sensor in the t-tubule opens
a Ca2+
channel
In the skeletal muscle crossbridge cycle, the cycle stops and rigor
sets in unless which one of the following is present? - correct
answers✅✅ATP
, EXAM 1 SYSTEMS PHYS Questions and
Answers A+ Guide
Force of a skeletal muscle can be modulated
(physiologically or experimentally) by which of the following? -
correct answers✅✅All of the above
Which one of the following would you expect in the leg
muscles of a highly trained 100 meter runner? - correct
answers✅✅Fast myosin ATPase rate, low mitochondrial content,
low
capillary density, high glycolytic capacity
Troponin T is often used as a serum marker of a myocardial
infarction. Which one of the below statements best describes the
function of troponin T in skeletal muscle? - correct
answers✅✅Involved in exposing the myosin binding site on
actin
Which describes calcium mobilization in smooth muscle? -
correct answers✅✅Involves influx of Ca2+ from extracellular
space and release
of Ca2+ from sarcoplasmic reticulum
preganglionic neuron: para - correct answers✅✅long
Synapse with postganglionic
