The letter A is the one that represents a neurotransmitter acting via direct effects.
<h3>What is a neurotransmitter?</h3>
These are chemical messenger that helps carries signals across the neurons and target cells throughout the body.
Hence, the letter A represents a neurotransmitter acting via direct effects because its involves direct connection between the neurons.
Therefore, the Option A is correct.
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An isometric contraction is the kind of contraction that leads to development of tension but no increase in length.
An isometric contraction occurs as the muscle produces tension without changing the angle of a skeletal joint. Isometric contraction is a static muscle action that helps to maintain the posture. For example, the antigravity muscles. It occurs in the biceps when the arms may be holding a weight. In such a posture, the biceps enlarge due to holding of weight and produces tension but do no increase in length. It stops the flexion of elbow. In such contraction, no work is done, and lesser amount of heat energy is released in comparison to isotonic contractions.
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The U.S. Government used treaties as one means to displace Indians from their tribal lands, a mechanism that was strengthened with the Removal Act of 1830. In cases where this failed, the government sometimes violated both treaties and Supreme Court rulings to facilitate the spread of European Americans westward across the continent.<span>As the 19th century began, land-hungry Americans poured into the backcountry of the coastal South and began moving toward and into what would later become the states of Alabama and Mississippi. Since Indian tribes living there appeared to be the main obstacle to westward expansion, white settlers petitioned the federal government to remove them. Although Presidents </span>Thomas Jefferson<span> and </span>James Monroe<span> argued that the Indian tribes in the Southeast should exchange their land for lands west of the Mississippi River, they did not take steps to make this happen. Indeed, the first major transfer of land occurred only as the result of war.</span>
Answer:
The United States is accusing China of dumping
tires
. The United States is imposing tariffs to raise the price of Chinese tires by
one-third
of the current cost. On the other hand, China is accusing the United States of
protectionism
. To get back at the United States, China is investigating whether the United States unfairly
subsidizes
its exports. Experts are afraid that this dispute between the two countries will erupt into a
trade war
