For the athlete or patient hoping to increase muscle size by weight training the best combination of intensity, frequency and type of exercise still remains a matter of individual choice rather than a scientific certainty. 展开 关键词: Humans Muscles Organ Size Muscle Contraction Physical Exertion ...
The Drosophila melanogaster larval neuromuscular junction (NMJ)—a synapse formed between motor neurons (MNs) and skeletal muscle fibers, critical for the control of muscle contraction, has been widely used as an in vivo model in which to study the machinery that regulates bouton formation10,11. ...
Depending on the muscle and the intended outcome of the contraction, muscles can either lengthen or shorten. A concentric contraction occurs when the muscle decreases in length, such as when performing abicepcurl. Aneccentric contractionoccurs when the muscle increases in length, such as when doing...
In effect, the muscle cell runs out of energy and fluid and becomes hyperexcitable, resulting in a forceful contraction. This spasm may involve part of a muscle, the whole muscle, or even adjacent muscles. Overuse as a cause of skeletal muscle spasms is often seen in athletes who are doing...
Embryonic myosin heavy chain as a differentiation marker of developing human skeletal muscle and rhabdomyosarcoma. Exp Cell Res 1986; 163: 211–220. Article PubMed CAS Google Scholar Kugelberg E. Histochemical composition, contraction speed and fatigability of rat soleus motor units. J Neurol Sci ...
Answer to: As a result of the long refractory period, cardiac muscle cannot exhibit ___. (a) contraction (b) tetanus (c) fatigue (d) relaxation...
-the actin fils overlap the ends of the thick fils but they do not extend into the middle of a relaxed sarcomere, and thus the central region (the H zone, which lacks actin fils and looks a bit lighter) is sometimes called the bare zone-when contraction occurs, and the actin-containing...
Molecular screens comparing different disease states to identify candidate genes rely on the availability of fast, reliable and multiplexable systems to interrogate genes of interest. CRISPR/Cas9-based reverse genetics is a promising method to eventually achieve this. However, such methods are sorely la...
Describe the psoas muscle as it relates to muscle contraction. What keeps muscles contracted continuously and what ends the contraction? What function occurs as a result of the contractions in the skeletal muscle and smooth muscle? Describe the muscle contraction process from the arrival of an actio...
The mechanism of contraction of smooth muscle is believed to be fundamentally the same as that of skeletal and cardiac muscles, i.e., contraction occurs according to the crossbridge cycling/sliding filament/swinging lever arm model whereby thick and thin filaments slide relative to one another, wi...