相关实验视频
Updated: Jul 12, 2025

07:51
Mechanical Control of Relaxation Using Intact Cardiac Trabeculae
Published on: February 17, 2023
1.3K
肌氨酸和热氨酸-热素互补调节肌肉的热激活
Shuya Ishii1,2, Kotaro Oyama1,2, Fuyu Kobirumaki-Shimozawa2
1Foundational Quantum Technology Research Directorate, National Institutes for Quantum Science and Technology , Gunma, Japan.
The Journal of general physiology
|October 23, 2023
概括
温度通过影响热素和热素相互作用,显著影响肌肉收缩. 研究表明,在体温范围内,仅热量就能启动肌肉缩短和丝滑动.
科学领域:
- 肌肉生理学 肌肉生理学
- 生物物理学的生物物理.
- 萨尔科默尔的动态
背景情况:
- 条状肌肉收缩依赖于 (Ca2+) 与素C结合,素C与素C结合,素C与素C结合,素C与素C结合,素C与素C结合,素C与素C结合,素C与素C结合,素C与素C结合.
- 在生理范围内的温度升高也可以通过将平衡转向"开启"状态来促进肌肉收缩,独立于Ca2+.
研究的目的:
- 在孤立的快速骨肌纤维细胞中研究瘤缩短的温度依赖性.
- 用体外运动性试验分析薄丝滑动速度对不同类型肌肉素的温度依赖性.
主要方法:
- 利用光学加热显微镜在孤立的肌纤维上进行快速温度变化 (25至41.5°C).
- 采用了体外运动性试验来测量复制的快速骨和心脏薄丝在快速骨和β-心脏肌肉素上的滑动速度.
主要成果:
- 快速加热诱导了肌纤维细胞中的可逆性瘤缩短.
- 快速骨细丝显示了类似的温度依赖 (Q10~8) 快速骨肌蛋白,如在肌纤维细胞缩短观察到.
- 这两种细丝类型都在较低的温度下开始在快速骨肌肉蛋白上滑动,而非贝塔心脏肌肉蛋白.
- 心脏细丝在较低的温度下滑动,而不是在两种肌肉素类型的快速骨细丝.
结论:
- 哺乳动物的条纹肌肉收缩是微调的,由肌肉素和热素-热素调节的相互作用在体温范围内.
- 温度作为一个关键因素,补充Ca2+信号,以根据生理需求有效地进行肌肉收缩.
相关概念视频
Actin and Myosin in Muscle Contraction
12.1K
Actin and myosin are contractile proteins that form the sarcomere found in skeletal muscle tissues for regulating muscle contraction. Actin, a globular contractile protein, interacts with myosin for muscle contraction. The skeletal tissue appears striped or striated under a microscope due to the repeated arrangement of contractile proteins actin and myosin along the length of myofibrils. Dark A bands and light I bands repeat along myofibrils, and the alignment of myofibrils in the cell causes...
12.1K
Relaxation of Skeletal Muscles
3.3K
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....
3.3K
Cross-bridge Cycle
117.6K
As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.
117.6K
The Sarcomere
8.2K
A sarcomere is a microscopic segment repeating in a myofibril. The sarcomere fundamentally consists of two main myofilaments: thick filaments called myosin and thin filaments called actin. These filaments interact by sliding past each other in response to stimulus. In addition to myosin and actin, several other proteins, such as tropomyosin, troponin, titin, nebulin, myomesin, α-actinin, and dystrophin, play crucial roles in regulating, structuring, and functioning of the sarcomere.
Each...
Each...
8.2K
Excitation-Contraction Coupling in Skeletal Muscles
8.4K
Excitation-contraction coupling is a series of events that occur between generating an action potential and initiating a muscle contraction. It occurs at the triad, a structure found in skeletal muscle fibers that comprise a T-tubule and terminal cisternae of the sarcoplasmic reticulum on each side. These triads are visible in longitudinally sectioned muscle fibers. They are typically located at the A-I junction — the junction between the A and I bands of the sarcomere.
When an action...
When an action...
8.4K
Overview of Skeletal Muscle
11.8K
Skeletal muscles are composed of a bundle of muscle fibers and are attached to bones through tendons. Each skeletal muscle fiber is a single muscle cell. The sarcolemma, the plasma membrane of a skeletal muscle cell, consists of a lipid bilayer and glycocalyx that supports muscle fibers. The sarcolemma extends into the muscle cells to form tubular structures called transverse or T-tubules. Each side of the T-tubules consists of a membrane-bound structure called the sarcoplasmic reticulum,...
11.8K

