Breastfeeding - Letdown Reflex

46문장 100% 스페인어 번역 1명 참여 출처 : 칸아카데미
1 영상보기
영어 to
스페인어
2단 보기 1단 보기
번역 0%

Breastfeeding - Letdown Reflex발음듣기

다른 번역문 등록

Voiceover: Let's talk now about how the mother's breast knows when it's time to secrete and make milk to feed her infant.발음듣기

다른 번역문 등록

You might guess that it has something to do with the fact that there will be a hungry little guy there.발음듣기

다른 번역문 등록

You're right. I'll try and draw him without making him look like an alien.발음듣기

다른 번역문 등록

They do open their mouths very, very wide.발음듣기

다른 번역문 등록

You'd be surprised, and it does have something to do with the fact that the baby begins to suckle.발음듣기

다른 번역문 등록

The baby does begin to suckle, and the actual suction of that act does help to drain milk out of the breast.발음듣기

다른 번역문 등록

Remember we had the mammary glands here that contained the milk and they were lined by those myoepithelial cells, and they drained toward the nipple via the lactiferous ducts.발음듣기

다른 번역문 등록

So, yes, it does have to do with the baby suckling, but it's actually a little bit more exciting than that.발음듣기

다른 번역문 등록

Let me tell you why it's so exciting.발음듣기

다른 번역문 등록

In the nipple itself, are these things called mechanoreceptors.발음듣기

다른 번역문 등록

They detect when the baby begins to suckle, and they send messages to the mother's brain via her spinal cord.발음듣기

다른 번역문 등록

These are ascending sensory messages that go toward the spinal cord and up the spinal cord to the mother's brain.발음듣기

다른 번역문 등록

They go to a part of the brain called the hypothalamus.발음듣기

다른 번역문 등록

The hypothalamus then does two really important things.발음듣기

다른 번역문 등록

Firstly, the hypothalamus sends an on message, sends a go message to another kind of neuron called an oxytocin neuron.발음듣기

다른 번역문 등록

As you can probably guess, an oxytocin neuron releases a hormone called oxytocin, and I'll just get my pen to start working again. There we go.발음듣기

다른 번역문 등록

Then I'll just finish writing the word neuron over here for you.발음듣기

다른 번역문 등록

The oxytocin neuron is secreting oxytocin, and it's secreting that hormone from the posterior part of another segment in the mother's brain.발음듣기

다른 번역문 등록

That segment is called the pituitary gland.발음듣기

다른 번역문 등록

The oxytocin is being released from the posterior pituitary in the mother.발음듣기

다른 번역문 등록

The function of that oxytocin hormone is to cause these myoepithelial cells to contract.발음듣기

다른 번역문 등록

Secondly, the hypothalamus has to do something else.발음듣기

다른 번역문 등록

It has to turn off a different kind of neuron.발음듣기

다른 번역문 등록

It's sending an off signal to a neuron called a prolactin inhibitory neuron.발음듣기

다른 번역문 등록

I'll write this one down for you.발음듣기

다른 번역문 등록

This is a prolactin inhibitory cell or neuron.발음듣기

다른 번역문 등록

The prolactin inhibitory cell's job all year round basically, is to tell the cells that make prolactin another kind of hormone to tell them to be off.발음듣기

다른 번역문 등록

This is the prolactin inhibitory neuron, and its message is to say, "You know what?발음듣기

다른 번역문 등록

Don't make prolactin. I'll tell you what prolactin does in a minute.발음듣기

다른 번역문 등록

Obviously, this is our prolactin-making cell, so our prolactin cell, and what the hypothalamus does in response to this incoming information that hey there's a hungry baby out there, the hypothalamus is going to turn off the off signal.발음듣기

다른 번역문 등록

That is going to result in more prolactin being secreted, and what does prolactin do?발음듣기

다른 번역문 등록

Well, maybe you can guess from it's name, pro, meaning that it's sorry, I'm writing pro.발음듣기

다른 번역문 등록

We don't want to do that.발음듣기

다른 번역문 등록

Prolactin is basically pro lactin, or pro milk.발음듣기

다른 번역문 등록

It is going to cause something called lactogenesis, or the making of milk inside the mammary gland.발음듣기

다른 번역문 등록

Together these two things, these two hormones, prolactin, and I'll write it in for you here, prolactin which is being released from the anterior pituitary, the ant. pit., and also oxytocin that's being released from the posterior pituitary.발음듣기

다른 번역문 등록

Those two hormones are going to cause milk to be made via prolactin and milk to be ejected, or shot out of the lactiferous ducts via the action of oxytocin on the myoepithelial cells.발음듣기

다른 번역문 등록

Now here is the best part. You ready for this?발음듣기

다른 번역문 등록

This whole cascade of events can also be triggered by the sound of a baby's cry.발음듣기

다른 번역문 등록

It doesn't even have to be your baby.발음듣기

다른 번역문 등록

The sound of a baby's cry will be picked up by a mother, a lactating mother's ear, and that information will be sent via other sort of higher centers in the brain. I'll just write higher centers.발음듣기

다른 번역문 등록

Those are auditory centers and other higher parts of the brain.발음듣기

다른 번역문 등록

Those higher centers will send a message to the hypothalamus saying initiate this cascade of events and cause milk to be ejected even if a baby isn't suckling.발음듣기

다른 번역문 등록

This is kind of a back-up mechanism because it means that potentially any lactating mother in the vicinity could nourish any hungry child.발음듣기

다른 번역문 등록

This whole pathway, this amazing ability to communicate between the baby and the mother is called the let down reflex, the let down reflex.발음듣기

다른 번역문 등록

칸아카데미 더보기더 보기

전체보기
Top