Question

Which characteristic or component is shared by skeletal muscle and smooth muscle?

1) Thick and thin filaments arranged in sarcomeres
2) Troponin
3) Elevation of intracellular [Ca₂⁺] for excitation-contraction coupling
4) Spontaneous depolarization of the membrane potential
5) High degree of electrical coupling between cells

Answer 1

Skeletal muscle and smooth muscle share the characteristic of having thick and thin filaments arranged in sarcomeres.

Step-by-step explanation:

Both skeletal muscle and smooth muscle have thick and thin filaments arranged in sarcomeres. In skeletal muscle, sarcomeres are responsible for muscle contraction, while in smooth muscle, they are not present but actin and myosin contractile proteins, as well as thick and thin filaments, are present.

However, other characteristics and components mentioned in the options are not shared by both types of muscle.