At about 38 weeks after conception, the fetal brain signals the release of hormones, specifically <u>oxytocin,</u> which prepares the fetus for delivery and begins labor.
Explanation:
Oxytocin is a hormone released by posterior pituitary gland because it is responsible for the uterine contractions during labour.
Fetal hypothalamus secretes corticotropin releasing hormone near term which stimulates fetal Anterior pituitary gland to secrete adrenocorticotropin hormone (ACTH) which stimulates adrenal cortex to produce cortisol which stimulates the secretion of estrogen from placenta, inhibition of P synthesis causing increased uterine contractions by cauisn increased oxytocin released from posterior pituitary gland.
oxytocin is an hormone with the mass number of 1007.19 grams per mol and with the chemical formula of C43H66N12O12S2. This hormone is produce in the part of the brain which is beside the pituitary gland which is known as the hypothalamus. Apart from the fact that the hormone that is oxytocin is released about 266 days from conception period which aids during the delivery of new born babies, the hormone is also known as the 'love hormone' which is released during social bondings.
When a spider weaves a web, this is an innate, or instinctual action. A spider needs no training from other spiders (including its parents) to know how to spin a web.
