Question

question 14 (2.5 points)
sphincter, or dilator, muscles are special circular muscles that open and close to control the passage of substances.
true
false
question 15 (2.5 points)
muscles are responsible for producing most of our body heat.
true
false

Explanation:

Sphincter or dilator muscles are circular - like and control substance passage. Muscle contractions generate body heat.

Answer:

Question 14: True
Question 15: True