exam 4 Flashcards
pressure in the _____, predominately during ______, provides the energy to drive blood through the coronary vasculature in the ventricular myocardium.
aorta, diastole
When is Ca2+ released from the sarcoplasmic reticulum in contractile cardiomyocytes?
when Ca2+ enters the cytoplasm through DHP receptors and binds to RYR receptors
Lidocaine is a local anesthetic that blocks voltage-gated Na+ channels. You
would expect this drug to have its greatest effect on cells that:
release Ca2+ from the SR, respond to an increase in cAMP by phosphorylating Ca2+ pumps
Which of the following causes the atrioventricular valves to open?
a. contraction of the atrial myocardium
b. contraction of the ventricular myocardium
c. action potentials in the conductile cardiomyocytes arriving at the atrial myocardium
d. the low pressure venous return.
e. a and c are correct.
Low pressure venous return
During the production of lymph ____________ generates a(n) ___________ force to move fluid out of the
capillary and into the extracellular space.
the heart, hydrostatic
Under some conditions such as pericarditis, fluid accumulation leading to increased pressure in the
pericardial sac may prevent:
ventricular filling from the vena cava and the pulmonary veins
Antibodies secreted from plasma B cells are:
glycoproteins
The CD8 protein on T killer cells binds to:
MHC I proteins on all nucleated cells
During the production of lymph ____________ generates a(n) ___________ force to move fluid into the capillary and out of the extracellular space.
protein in plasma, osmotic
what is starling’s law?
increases cardiac output = increased SV and increased EDV
When is Ca2+ released from the sarcoplasmic reticulum in skeletal muscle?
When a cytoplasmic portion responds to Na+ influx by moving out of the RYR receptor channel
