相关实验视频
Updated: Aug 15, 2026

10:56
Long-term Behavioral Tracking of Freely Swimming Weakly Electric Fish
Published on: March 6, 2014
概括
吃软体动物的太阳鱼Lepomis microlophus表现出专门的喉肌肉活动,以粉碎猎物. 这种独特的神经肌肉程序是为了高效地消耗软体而进化而来的,与它的亲戚不同.
科学领域:
- 比较生理学比较生理学
- 进化生物学是进化的生物学.
- 神经伦理学 神经伦理学
背景情况:
- 大多数太阳鱼物种都表现出一个一般化的肌肉活动模式来食.
- 一种食用软体动物的太阳鱼Lepomis microlophus表现出一种专门的喉肌肉活动模式.
- 这种专业化对于其独特的软体动物饮食至关重要.
研究的目的:
- 为了研究吃软体动物的阳光鱼Lepomis microlophus的神经肌肉控制食.
- 为了比较L. microlophus与其亲属的喉肌肉活动模式.
- 了解特殊养适应的进化基础.
主要方法:
- 电肌图被用来记录Lepomis microlophus的喉肌肉电活动.
- 在食不同类型的猎物时,分析了肌肉活动模式.
- 进行了与相关的太阳鱼物种的遗传学比较.
主要成果:
- 莱波米斯 (Lepomis microlophus) 呈现出高度专业化的喉肌肉活动模式,与大多数其他太阳鱼不同.
- 这种专业化模式无论猎物类型如何,都保持一致.
- 一个密切的亲戚L. microlophus使用一个专门的模式,牛粉碎,但一个原始的模式,其他猎物.
结论:
- 牛粉碎物种的有效食用软体动物归因于控制食装置的神经肌肉程序的进化修改.
- 在L. microlophus中,特殊的食适应是由神经控制机制的转变驱动的.
- 神经肌肉程序的进化变化是饮食专业化的关键.
相关概念视频
Classification of Skeletal Muscle Fibers
Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
Slow-Twitch Muscle Fibers
Slow oxidative, muscle fibers appear red due to large numbers of capillaries and high levels of...
Slow-Twitch Muscle Fibers
Slow oxidative, muscle fibers appear red due to large numbers of capillaries and high levels of...
Muscle Contraction
Fixed Action Patterns
A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
Muscle Contraction
In skeletal muscles, acetylcholine is released by nerve terminals at the motor endplate—the point of synaptic communication between motor neurons and muscle fibers. The binding of acetylcholine to its receptors on the sarcolemma allows entry of sodium ions into the cell and triggers an action potential in the muscle cell. Thus, electrical signals from the brain are transmitted to the muscle. Subsequently, the enzyme acetylcholinesterase breaks down acetylcholine to prevent excessive muscle...
Motor Unit Stimulation
When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
Muscle 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...

