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The correct option is (a) i.e. Channel rhodopsin is activated and opened, events occur in the hypothalamus of a mouse brain expressing channel-rhodopsin when the blue light is switched on.
A region of the brain called the hypothalamus has a lot of tiny nuclei with various roles. The pituitary gland connects the neurological system to the endocrine system, which is one of its most crucial roles. The hypothalamus, which is located below the thalamus, is a part of the limbic system. According to neuroanatomic nomenclature, it comprises the ventral region of the diencephalon. Every vertebrate has a hypothalamus in their brain. In individuals, it is the size of an almond. The hypothalamus regulates some metabolic processes as well as the functions of the autonomic nervous system. Certain neurohormones it generates and releases are referred to as releasing hormones or hypothalamus hormones, and they either stimulate or inhibit the pituitary's ability to secrete hormones. The hypothalamus is split into three regions in a parasagittal plane (supraoptic, tuberal, and mammillary), indicating an anterior-posterior placement; and three regions in a coronal plane (periventricular, medial, and lateral), indicating a medial-lateral placement. The hypothalamic nuclei are located in these specific areas and locations. It is present in all vertebrate nervous systems.
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