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.
Answer:
a.transmit sensory input to the CNS
Explanation:
Afferent neurons will take input from your muscles, skin etc. and send it to your CNS (usually via spinal nerves).
All cells are dependent on glucose for energy (in the form of ATP).
Answer:
Enzymes help break down larger molecules like fats, proteins and carbs into smaller molecules that are easier to absorb across the small intestine.
I think the correct answer from the choices listed above is option A. A single population is made of multiple organisms. In biology, population is a group of individuals which belongs to the same species that lives in the same area. Hope this answers the question.
