In the first, called active muscular contraction (AMC), neural signals cause the muscles in the larynx to contract in a constant rhythm.
Waves of muscular contraction travel along its length, moving the animal slowly over the ground.
It keeps the animal from shortening when locomotory waves are produced through muscular contraction.
The latter would use the heart's motion to convert the energy of muscular contraction into electrical energy.
Muscular contraction produces electrical activity, which increases as the contraction grows stronger.
Most crawl between soil particles or among the villi of a host's gut by undulating waves of muscular contraction.
During ordinary breathing, muscular contraction occurs only on inspiration, expiration being accomplished "passively" by elastic recoil of the lung.
The respiratory muscles displace the equilibrium of elastic forces in the lung and chest in one direction or the other by adding muscular contraction.
The strength of muscular contraction is a function of the rate of impulse delivery rather than of the number of fibres contracting (as is the case in vertebrates).
Their great strength, which is necessary for withstanding the stresses generated by muscular contraction, is attributed to the hierarchical structure, parallel orientation, and tissue composition of tendon fibres.
In thaliaceans an exhalant current of water, which in dolioloids and salps is combined with a strong muscular contraction, creates a jet stream that propels the animal forward.
