With the application of a stimulus voltage, the isolated muscle fibre will show contraction fully after the threshold voltage is achieved. An increase in the stimulus voltage will increase the force of contraction, but the amount of contraction will remain the same.
Explanation: Muscle fibres do contain the contractie proteins like actin and myosin. With the advent of an electrical stimulus, there's a change in the intercalated discs or the T junctions of the muscle fibre which leads to the opening of calcium channels of sarcoplasmic rericulum. This increases the calcium ion concentration of the cell and the actin heads get opened which leads to the sliding movement of actin over myosin and thereby contraction occurs.
According to the All or None principle, the muscle fibre will show contraction fully, or won't show any contraction. Sl here, with increase in stimulus voltage, the contraction will be more powerful, but the extent of contraction will be same for all voltages above threshold.
A. By receiving an injection. NPO means nothing by mouth
Answer:
There are three main ways of avoiding the spreading of an invasive plant species via manual control. Manual control techniques include activities such as hand-pulling, digging, flooding, mulching, burning, removal of alternate hosts and manual destruction or removal of nests, egg masses or other life stages. These techniques work best on small populations or in areas where chemicals or motorized equipment cannot be used. Manual control efforts must be persistent and several treatments may be needed to reduce or eliminate the target population. If infestations are too pervasive, manual control may become labor intensive and thus not economically feasible. Digging/Hand-pulling: Remove entire root to prevent resprouting. Usually works best with small or young plants, in sandy or loose soils, or when soils are damp. Smothering: Use mulch, black plastic, carpet, or any other impenetrable barrier to cover target plants for at least one growing season. The effectiveness of this technique can be increased by first cutting the target plants and then smothering them. If dealing with a species that produces clones, be sure to cover all stems of the species. Flooding: This is only feasible where water levels can be manipulated to completely cover cut plants for a period of time. The depth of water necessary and the amount of time cut plants should be covered will vary from species to species.
Answer:
A.) Magnesium
Explanation:
The Enrichment Act of 1942 mandates that thiamin, niacin, riboflavin, and iron have to be added back to refined grain products at specified levels to prevent nutritional deficiencies in America.
I hope this helped. I am sorry if you get this wrong.
Brainliest?
