BIOL 330- Quiz 3
QUESTIONS AND CORRECT ANSWERS | ALREADY GRADED A+ WITH
COMPLETE SOLUTIONS
Which of the following is the voltage sensor that most directly leads to an increase in
cytoplasmic Ca++ in skeletal muscle? - DHP/ryanodine receptor
What is the function of T-tubules? - They conduct AP's from sarcolemma to the interior of
the muscle cell
Calcium binding to calmodulin causes phosphorylation of what protein in what type of muscle? -
Myosin in smooth muscle only
The primary site of exchange between blood & interstitial fluid occurs across what type of
vessel? - Capillaries
What is the major region of heart containing pacemaker cells? - SA node
What blood vessel carries deoxygenated blood to the lungs? - Pulmonary artery
What structure carries electrical current (ions) between cells of the heart? - Gap junctions &
Connexins
The rapid depolarization phase of heart pacemaker cells is caused by which of the following? -
Movement of Ca++ through L-type channels
The autonomic nervous system innervates all of the following effector organs & tissues
EXCEPT: - Skeletal muscle
QUESTIONS AND CORRECT ANSWERS | ALREADY GRADED A+ WITH
COMPLETE SOLUTIONS
Which of the following is the voltage sensor that most directly leads to an increase in
cytoplasmic Ca++ in skeletal muscle? - DHP/ryanodine receptor
What is the function of T-tubules? - They conduct AP's from sarcolemma to the interior of
the muscle cell
Calcium binding to calmodulin causes phosphorylation of what protein in what type of muscle? -
Myosin in smooth muscle only
The primary site of exchange between blood & interstitial fluid occurs across what type of
vessel? - Capillaries
What is the major region of heart containing pacemaker cells? - SA node
What blood vessel carries deoxygenated blood to the lungs? - Pulmonary artery
What structure carries electrical current (ions) between cells of the heart? - Gap junctions &
Connexins
The rapid depolarization phase of heart pacemaker cells is caused by which of the following? -
Movement of Ca++ through L-type channels
The autonomic nervous system innervates all of the following effector organs & tissues
EXCEPT: - Skeletal muscle
