: A tropic hormone always increases the size of an endocrine gland.  #2: Spontaneous action potentials in the heart are primarily triggered by flux of K+ into cells through If channels.  #3: Increasing the frequency of action potentials in motor units generates more tensio

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Hello, I do not understand these questions, can I get help with them, please? Below are 3 statements, explain if each is true/false and why (VERY brief statement) 

#1: A tropic hormone always increases the size of an endocrine gland. 

#2: Spontaneous action potentials in the heart are primarily triggered by flux of K+ into cells through If channels. 

#3: Increasing the frequency of action potentials in motor units generates more tension than increasing the number of motor units. 

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