Asked by Katie Hernandezö on May 10, 2024
Verified
A drug that interferes with the active transport of Ca2+ from the sarcoplasm back into the sarcoplasmic reticulum would result in
A) relaxation of the muscle fiber.
B) contraction with no relaxation.
C) muscle hypertrophy.
D) fibrosis of the muscle.
E) an imbalance of blood calcium.
Sarcoplasmic Reticulum
A specialized type of smooth endoplasmic reticulum found in muscle cells, involved in calcium storage and release for muscle contraction.
Active Transport
The movement of molecules across a cell membrane from a region of lower concentration to one of higher concentration, requiring energy.
Muscle Hypertrophy
The increase in muscle size and mass due to exercise, particularly strength training.
- Identify the function and transit of ions, especially calcium, in the process of muscle contraction and relaxation.
- Describe the effects of various stimuli and drugs on muscle contraction and relaxation.
Verified Answer
RC
RONGZHENG CHENGMay 14, 2024
Final Answer :
B
Explanation :
Active transport of calcium ions back into the sarcoplasmic reticulum is crucial for muscle relaxation after a contraction. If a drug interferes with this process, the muscle fiber would remain in a state of contraction because the calcium ions necessary for contraction would remain in the sarcoplasm, continuously triggering contraction without allowing relaxation.
Learning Objectives
- Identify the function and transit of ions, especially calcium, in the process of muscle contraction and relaxation.
- Describe the effects of various stimuli and drugs on muscle contraction and relaxation.