A stab wound into the heart can result in cardiac tamponade. This means that
A. the electrical conduction system of the heart is damaged.
B. the heart is compressed by blood in the pericardial sac.
C. blood enters the pleural cavity.
D. the left coronary artery has been damaged or cut.
E. the heart has lost all of its blood.
Answer: B
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The attached portion of the ________ is the root, whereas the freely moving portion is the shaft or body.
A. uterus B. penis C. vas deferens D. seminal vesicles
If the sodium-potassium pumps in the cell membrane of a neuron fail to function, over time
A) the membrane resting potential will become more positive than normal. B) the intracellular concentration of sodium ion will increase. C) the extracellular concentration of potassium ion will increase. D) All of the answers are correct.
The falling phase of the action potential is due to
a. calcium influx b. potassium efflux c. chloride influx d. sodium efflux e. the action of Na+-K+ pumps
Unique voltage-gated Na+ channels in pacemaker cells that open when the membrane becomes more negative (hyperpolarizes) and bring about the initial depolarization in the pacemaker potential are called ________ channels
Fill in the blank(s) with correct word