Which of the following is NOT an anticoagulant or stimulator of blood clot dissolution?
A. Tissue plasminogen activator (t-PA)
B. Heparin
C. Aspirin
D. Vitamin K
E. Thrombin
Answer: D
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A person struggling with a stressful exam question might experience difficulty focusing her eyes on the paper because
A. activation of her sympathetic nerves inhibits contraction of her ciliary muscles. B. activation of her parasympathetic nerves inhibits contraction of her ciliary muscles. C. she suddenly develops presbyopia. D. activation of her parasympathetic nerves causes sudden contraction of her ciliary muscles. E. activation of her sympathetic nerves causes sudden contraction of her ciliary muscles.
The rising phase of the action potential of a cardiac cardiomyocyte is caused by a __________ current
A) Potassium B) Sodium C) Chloride D) Calcium Fill in the blank with the correct answer.
Under which set of circumstances would the diameter of peripheral blood vessels be the greatest?
A) decreased parasympathetic stimulation B) increased sympathetic stimulation C) both increased parasympathetic and increased sympathetic stimulation D) decreased sympathetic stimulation E) increased parasympathetic stimulation
Capillaries
a. Are where the ultimate purpose of the cardiovascular system occurs b. Contain ~25% of our blood at any given moment c. Have very thick walls and are surrounded by smooth muscle d. Are where blood flow is at its peak velocity