Answer: Acetylcholine.
Explanation: Acetylcholine is a neurotransmitter that mediates many sinaptic functions in nervous system. When a motor neuron releases acetylcholine at the neuromuscular junction, it binds to nicotinic receptors in muscular fibers and activates a signal cascade that will free intracellular calcium ions, causing the contraction of the muscular fibers.
Answer:
Explanation:
In cellular biology, active transport is the movement of molecules across a membrane from a region of lower concentration to a region of higher concentration—against the concentration gradient. Active transport requires cellular energy to achieve this movement.
Answer:
<em><u>The lack of topsoil inhibits the growth of more diverse organisms in the region.</u></em>
Explanation:
Following catastrophic or destructive events, primary succession occurs with the growth of the microorganisms. Here a non-habitable area is exploited by a colonizing organism. For instance, lichens and moss break down rock and decompose to add nutrients to sediment creating topsoil.
Ultimately, these make the environment more livable by nutrient cycling, weathering, etc., which ushers in secondary succession. Here over time, the cultures become more dynamic, more diverse and an ever-larger food web.
Answer:
<h3>mimics the diffusion and osmosis processes of the cell membrane </h3>
<em>Like a cell membrane, dialysis tubing has a semi-permeable membrane, which allows small molecule to permeate through the membrane. Thus, the dialysis tubing</em>
Explanation:
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The recommended daily intake, or RDA, for vegetables is 2.5 to 3 cups every day; whereas, the recommended daily intake for fruits is 2 cups every day.
Vegetables and fruits provide essential vitamins for the growth, repair and maintenance of the body's function. However, their servings are usually limited due to the fructose content and other factors. The most emphasized food groups are the carbohydrates and the proteins.
