2A →A₂ K,fast B₂ + A₂ $\rightarrow$ 2AB K,slow
A)2
B)3
C)4
D)1
E)2 and 3

question 81

Multiple Choice

2A →A₂ K,fast B₂ + A₂ $\rightarrow$ 2AB k,slow

• A)2
• B)3
• C)4
• D)1
• E)2 and 3

---

Definitions:

Thoracic Cage

The bony frame around the chest composed of the ribs, sternum, and thoracic vertebrae, protecting the heart and lungs.

Intercalated Discs

Intercalated discs are specialized connections between heart muscle cells (cardiomyocytes), facilitating coordinated contraction through electrical and mechanical linkage.

Gap Junctions

Specialized intercellular connections that allow for direct communication between cells through the exchange of ions and small molecules.

Cardiac Muscle

A type of involuntary striated muscle found exclusively in the heart, responsible for heart contractions.