insulin and glucagon hormones that monitor how you absorb sugar, your bodies main source 07:44 of fuel. 07:45 Your thyroid and parathyroid glands at the base of your throat secrete hormones that 07:49 regulate your metabolism and monitor your body's calcium levels; if you have testicles, 07:53 they're secreting your sex hormones like estrogen and testosterone, and if you've got ovaries, 07:57 they're doing that job. 07:58 And all those glands are super important, but there is one gland that rules them all, 08:03 and in the darkness binds them: the pituitary gland. 08:05 Although it's just a little pea-sized nugget hidden deep in the bunker of the brain, it 08:10 is the most influential gland in this system. 08:12 It releases a vital growth hormone that spurs physical development and that love hormone, 08:17 oxytocin, that promotes warm, fuzzy feelings of trust and social bonding. 08:21 What really makes the pituitary the master gland is that its secretions boss around the 08:25 other endocrine glands, but even the pituitary has a master in the hypothalamus region of 08:31 the brain, which we will talk more about next episode. 08:33 So, AHHHHHHHHH! if I managed to scare you, sorry, but I'm illustrating a point. 08:38 You have no control over being scared, but maybe now you do understand a little more 08:42 clearly how your nervous and endocrine systems worked together to call the shots. 08:46 First, the sensory input from your eyes and ears went to your brain, the simplest bits 08:50 of your hypothalamus without even letting you analyze it and were like ahhhh, and then, 08:55 that ran down the chain of command from your pituitary to your adrenal glands, to the hormone 09:00 adrenaline, to the rest of your body and then back to your brain, which then realized that 09:04 I was just messing with you and told everybody to just calm down for once! 09:08
The whole deal is a feedback loop: your nervous system directs your endocrine system which 09:13 directs your nervous system, brain, gland, hormone, brain. 09:16 And of course each of these systems is fantastically complex. 09:19 Way more than we can get into here. 09:21 So, in our next lesson, we're gonna get all up in your brain, and delve deeper into the 09:25 different components of your nervous system, find out what your old brain is, and learn 09:30 about how much of your brain you actually use. 09:33 In the meantime, thank you for watching this lesson in Crash Course Psychology which was 09:36 brought to you by Zane Ice, who wants to say hi to his friend Harrison. 09:40 Thank you, Zane. 09:41 If you'd like to sponsor an episode and give your own shout-out, you can learn about that 09:45 and other perks available to our subbable subscribers, just go to subbable.com/crashcourse. 09:49 This episode was written by Kathleen Yale, edited by Blake de Pastino, and our consultant 09:54 is Dr. Ranjit Bhagwat. 09:56 Our director and editor is Nicholas Jenkins, the script supervisor was Michael Aranda, 10:00 who was also our sound designer, and the graphics team is Thought Cafe.
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- Winter '15