Question

In summation, how long does a typical contraction last?*

A) 20-2000 ms
B) 1-2 secs
C) 10-200 ms
D) over 9000"

Answer 1

A typical contraction can vary in duration depending on the type of muscle and the specific situation. Cardiac contractile muscle has an absolute refractory period of approximately 200 milliseconds and a relative refractory period of approximately 50 milliseconds. During labor, uterine contractions can start with durations of 20-40 seconds and progress to lasting for a full minute.

Step-by-step explanation:

A typical contraction in the context of the question refers to the contraction of muscles in different scenarios. The duration of a typical contraction can vary depending on the type of muscle and the specific situation. For cardiac contractile muscle, the absolute refractory period lasts approximately 200 milliseconds, and the relative refractory period lasts approximately 50 milliseconds, totaling to 250 milliseconds. In the case of uterine contractions during labor, they may start with contractions occurring every 3-30 minutes and lasting 20-40 seconds, and progress to contractions occurring every 1.5-2 minutes and lasting for a full minute.