A twitch is defined as a single, brief contraction period and then relaxation period of a skeletal muscle in response to a single stimulation. Contraction period involves receptive power strokes that pull the thin filaments past the thick filaments shortening sacromeres and muscle tension increases as the sacromeres shorten. Relaxation period begins with or release of cross bridges resulting from the return of Ca2+ back to sarcoplasmic reticulum. The strength of skeletal muscle contractions can be broadly separated into twitch, summation, and tetanus. A twitch is a single contraction and relaxation cycle produced by an action potential within the muscle fiber itself.
<span>Controls essential physiological and behavioural processes. These neurons are seen in hypothalamus, a part of brain contaning small nuclei. Hypothalamic neurons are positioned on the ventral part of forebrain. They respond to neural and physiological signals by producing neurotransmitters and peptide neuromodulators.</span>
Habitat isolation would be
The total magnification is calculated by MULTIPLYING the ocular lens magnification and the objective lens magnification.
Scientist uses 2 methods to determine the age of the universe. 1. by studying the oldest objects within the universe. 2. measuring how fast it is expanding.
