Exam 1 Flashcards
What is responsible for myocardial infarction and most strokes?
thrombosis
The vascular spasm associated with trauma, that helps limit blood loss is due primarily to which mechanism?
local myogenic spasm
Which of the following is associated with vasoconstriction and potentiates platelet degranulation?
Thromboxane A2 release from platelets
Which of the following is effective at dissolving clots that have formed?
Plasmin
What is the major function of thrombin?
convert fibrinogen to fibrin
NPY released from the sympathetic nervous system may augment which of the following?
collateralization
T/F Ca++ is required at all steps in the extrinsic clotting cascade.
true
A person whose blood sample clumps when treated with either anti-A or anti-B sera would be what blood type?
AB
Lacking the āDā antigen would be associated with which of the following?
Rh-
Compared to a typical ventricular muscle cell, which of the following is not a characteristic of the SA node?
plateau
At the end of repolarization, which of the following ions is closest to its Nernst equilibrium potential?
K+
A 2-3 X elevation in extracellular fluid of K+ ions has what effect on cardiac muscle?
weakness and flaccidity
Which of the following membrane permeability changes would increase heart rate?
decreased membrane permeability to K+
Acetylcholine binds to which cardiac receptors?
muscarinic
At rest, if you block both divisions of the autonomic nervous system what will happen?
+ chronotropic effect, - inotropic effect