click below
click below
Normal Size Small Size show me how
BIO202-CH16-Pineal
BIO202 - Ch 16 - Pineal Gland - Marieb/Hoehn - RioSala
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. |