Question

1. Which statement is true, given the circumstance in which Tim found himself?

a. The racing heart resulted from a day of intense exercise including climbing the bluff.
b. Increased heart rate is abnormal, given that Tim was well rested.
c. Tim experienced a normal reaction to a threat.
d. Tim is hallucinating because there are no mountain lions in the Ozarks.
e. Tim experienced the rest-and-repair response.

Answer 1

The event of being scared by a friend and having your heart rate speed up influences cardiac muscle contraction through the autonomic nervous system.

Step-by-step explanation:

The event of being scared by a friend and having your heart rate speed up influences cardiac muscle contraction through the autonomic nervous system. The sympathetic division of the autonomic nervous system prepares the body for a possible emergency by increasing heart rate. This response occurs due to the release of adrenaline, which floods the circulatory system and triggers an increase in heart rate. The activation of the sympathetic nervous system is a normal physiological response to a perceived threat.