When a muscle cell receives a signal from a motor neuron, every sarcomere within that muscle cell is activated. The signal moves from the motor neuron to the muscle cell by crossing the synapse. When acetylcholine binds the sodium enters the T tubules and this causes calcium to be released from the sarcoplamic reticulum. Calcium binds to tropomyosin, which allows actin to bind to myosin and each sarcomere contracts. There is nothing and no way to separate individual sarcomeres. They are all activated together.
Hyperthyroidism (over producing thyroid gland) and hypothyroidism (under producing thyroid gland).
Correct answer: Hippocampal
Brain imaging, structural or functional helps us to study the structure and functions of the brain and other parts of the nervous system. Post Traumatic Stress Disorder affects a network of brain areas, like hippocampus, amygdala, cingulate, and prefrontal cortex. In PTSD, the concentrations of corticotropin- releasing factors increases in the cerebrospinal fluids. This stress also leads to the change in the volume and functions of hippocampus, which has a crucial role in memory.
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Adaptation affects the diversity of an ecosystem by helping organisms survive different harsh conditions as well as survive their environment.
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Answer:
I believe the answer is C. Doldrums.
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