which of the following is true of a smooth muscle?
A. IT CAN'T MAINTAIN A STEADY STATE OF CONTRACTION
B. SMOOTH MUSCLE CAN SOFTEN MORE RELATIVE TO ITS LENGTH COMPARED WITH STRIATED (SKELETAL) MUSCLE
C. SMOOTH MUSCLE CAN'T MAINTAIN AN EVEN AMOUNT OF TENSION
D. ITS UNDER VOLUNTARY CONTRAL
To determine which of the statements is true about smooth muscle, we can go through each option and analyze its accuracy:
A. It can't maintain a steady state of contraction.
This statement is false. Smooth muscle is capable of sustained contractions and can maintain a steady state of contraction for an extended period of time. It is responsible for various physiological functions that require ongoing and sustained muscular activity, such as maintaining blood vessel tone.
B. Smooth muscle can soften more relative to its length compared with striated (skeletal) muscle.
This statement is true. Smooth muscle has a greater ability to stretch and lengthen compared to striated (skeletal) muscles. This quality of smooth muscle allows it to contract and relax with greater elasticity, facilitating functions such as peristalsis in the gastrointestinal tract.
C. Smooth muscle can't maintain an even amount of tension.
This statement is false. Smooth muscle is capable of maintaining an even amount of tension, which allows it to provide continuous force and maintain a stable contraction. This characteristic is particularly important in functions such as maintaining blood pressure.
D. It's under voluntary control.
This statement is false. Smooth muscle is not under voluntary control. It is classified as an involuntary muscle, meaning it functions automatically without conscious control. Smooth muscle is controlled by the autonomic nervous system, which regulates various bodily functions.
In conclusion, option B is the true statement regarding smooth muscle. It has the ability to soften more relative to its length compared to striated (skeletal) muscle.