Figure 4.23A

-The structures labeled "D" in the accompanying figure _____.
A) prevents movement of materials between cells
B) allows passage of a signal to contract heart muscles
C) allows the free passage of materials between cells
D) is found mostly in stomach tissue
E) is found in most tissues except heart muscle

Question

Figure 4.23A
 
-The structures labeled "D" in the accompanying figure _____.
A) ​prevents movement of materials between cells 
B) ​allows passage of a signal to contract heart muscles 
C) ​allows the free passage of materials between cells 
D) ​is found mostly in stomach tissue 
E) ​is found in most tissues except heart muscle

Quizplus · Accepted Answer

The structures labeled "D" are likely gap junctions, which allow the passage of ions and small molecules between cells, facilitating the transmission of signals such as those needed for heart muscle contraction.

Figure 4.23A -The Structures Labeled "D" in the Accompanying Figure _____