Factors such as adenosine and catecholamines alter heart rate by affecting the kinetics of
A) Voltage-sensitive Cl-channels.
B) Voltage-sensitive Na+channels.
C) Funny channels.
D) Voltage-independent K+channels.
Answer: C
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In terms of blood flow, why is it important that atrial diastole occurs just as ventricular systole begins?
A. Blood is continually propelled in a forward motion down its pressure gradient. B. The atria need that time to prepare for the next contraction. C. Ventricular systole pulls the remaining 20% of blood volume from the atria. D. Blood would flow too fast otherwise.
Positively charged ions are called cations.
Indicate whether this statement is true or false.
The gastroileal reflex
A) empties the duodenum. B) promotes gastric secretion. C) decreases peristaltic activity. D) moves some chyme to the colon. E) is relayed through the CNS.
Tendons, aponeuroses, and ligaments are all composed of ________ connective tissue, which contains tightly packed collagen fibers aligned parallel to applied forces
Fill in the blank(s) with the appropriate word(s).