Asked by Bryana Romero on May 25, 2024
Verified
Which of the following is NOT true of the latch state of smooth muscle contraction?
A) Myosin phosphatase removes the phosphate group from myosin.
B) It explains why smooth muscle can sustain tension for long periods of time.
C) It occurs when the phosphate is removed while the cross-bridges are attached to actin.
D) It occurs when the phosphate is removed while the cross-bridges are not attached to actin.
E) It allows contraction without a large energy expenditure.
Latch State
A phase in muscle contraction where the muscle remains tense without much energy consumption, commonly found in smooth muscle.
Smooth Muscle Contraction
The involuntary process by which smooth muscles found in the walls of internal organs contract and relax, controlled by the autonomic nervous system.
Myosin Phosphatase
An enzyme that plays a critical role in muscle relaxation by dephosphorylating myosin light chains.
- Understand the mechanisms of muscle contraction and relaxation, including the role of calcium.
Verified Answer
HS
Haris ShafiMay 28, 2024
Final Answer :
D
Explanation :
The latch state in smooth muscle contraction is characterized by the maintenance of tension with reduced energy expenditure. It occurs when the myosin heads remain attached to actin even after the phosphate group is removed, not when the cross-bridges are not attached to actin.
Learning Objectives
- Understand the mechanisms of muscle contraction and relaxation, including the role of calcium.