Examlex
_____ is the capacity to selectively focus your senses on particular stimuli or aspects of the environment.
Calcium Ion Concentration
The level of calcium ions (Ca2+) in a particular system, important for various cellular processes including signal transduction and muscle contraction.
Parathyroid Glands
Small endocrine glands in the neck that produce parathyroid hormone (PTH), which regulates calcium levels in the blood.
Fight-or-Flight Response
A biological response triggered by the perception of danger, hostility, or a threat to one's existence.
Secondary Sex Characteristics
Changes that develop during puberty; in males, include growth of facial and body hair, muscle development, and the increase in vocal cord length and thickness that causes the voice to deepen; in females, include development of the breasts, broadening of the pelvis, and the development and distribution of muscle and fat responsible for the female body shape.
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