BIO202-CH16-Pineal Word Scramble
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| Question | Answer |
| What are pinealocytes? | Secretory cells of pineal gland. |
| What is "brain-sand" or "pineal sand"? | Deposits of calcium salts in pineal gland easily seen in X-rays. |
| Major hormone secreted by pineal gland. | Melatonin - peak levels at night & least at noon. |
| Pineal gland indirectly receives input from __. | Visual pathways - concerning intensity & duration of daylight. |
| What is referred to as our "biological clock"? | Suprachiasmatic nucleus of hypothalamus - richly supplied with melatonin receptors. |
| How does the thymus change over a lifetime? | Large in infants & reduces throughout life till composed of adipose & CT in old age. |
| Name the hormonal product of thymic cells. | Thymopoietins, thymic factor, & thymosins - essential for immune system. |
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