The elasticity of the Windkessel vessel mainly influence（）
A. pulse pressure
B. Systolic pressure （Ps）
C. Diastole pressure （Pd）
D. peripheral venous pressure
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Which of the following is most likely to cause the heart to go into spastic contraction（）
A. Excess extracellular fluid calcium ions
B. Increased sympathetic activity
C. Increased body temperature
Decreased extracellular fluid potassium ions
A 70-year-old man enters the hospital emergency department and has been experiencing severe diarrhea（腹泻）. He has pallor, tachycardia, and an arterial pressure of 80/50, and has trouble walking. Which
A. Infusion of a balanced electrolyte solution
Blood infusion
C. Administration of an antihistamine（抗组胺药）
D. Infusion of a sympathomimetic drug （拟交感神经药）
Which of the following conditions will result in a flaccid heart（）
A. Excess potassium ions in the blood
B. Excess calcium ions in the blood
C. Excess sodium ions in the blood
D. Increased sympathetic stimulation
Which factor does NOT influence the venous return（）
A. Elasticity of the Windkessel vessel
B. Cardiac contractility
C. Position of the body
D. Action of “muscular pump”
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