相关实验视频
Updated: Aug 18, 2026
09:49
Procedures for Rat in situ Skeletal Muscle Contractile Properties
Published on: October 15, 2011
在蛇尾部肌肉中,每次抽的最小成本
1Department of Radiology and The Center for Bioengineering, University of Washington Medical Center, Seattle 98195-7115, USA.
Nature
|September 5, 1996
概括
蛇的摇尾肌肉通过最大限度地减少每次收缩的腺三酸盐 (ATP) 使用来有效地产生声音. 这种肌肉设计允许在非常低的能源成本下进行高频声.
科学领域:
- 动物学 动物学
- 生物力学 生物力学
- 动物生理学 动物生理学
背景情况:
- 声音的产生是动物在能源上昂贵的行为.
- 有效的肌肉收缩对于持续的声音产生至关重要.
- 蛇利用快速的尾部肌肉收缩来发出他们的警告声音.
研究的目的:
- 为了研究蛇声音产生的能量成本.
- 了解蛇声背后的肌肉生理学.
- 为了确定蛇如何以最小的能源消耗获得高频声音.
主要方法:
- 活体磁共振成像用于测量每肌肉抽的腺三酸盐 (ATP) 成本.
- 在蛇的尾巴摇肌肉中分析肌纤维体积密度.
- 与其他类型的肌肉 (机动运动,昆虫飞行) 进行尾动肌肉收缩成本的比较.
主要成果:
- 在蛇的尾巴的肌肉中,每次抽的ATP成本非常低 (0.015微摩尔ATP/g肌肉/抽).
- 尾巴的肌肉表现出减少的肌纤维体积密度 (32%).
- 这种肌肉设计优化了高频,低成本的收缩,与其他脊椎动物或昆虫肌肉不同.
结论:
- 蛇的摇尾肌肉专门用于高效,高频的声音产生.
- 尽量减少每次收缩的ATP消耗是实现持续摇的关键.
- 这种肌肉适应是动物王国中低成本,高频声音生成的独特策略.
相关概念视频
01:29Relaxation of Skeletal Muscles
The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open.
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open.
01:22Muscle Stimulation Frequency
The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...