Name: TED-ED】甲状腺はどのように代謝を管理しているのか？- エマ・ブライス (【TED-Ed】How does the thyroid manage your metabolism? - Emma Bryce)
Uploaded: 2021-01-14T05:25:24.000Z
Duration: 3 min 37 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

Nestled in the tissues of your neck is a small unassuming organ

that wields enormous power over your body.

Like the operations manager in a company,

its role is to make sure that the cells in your body are working properly.

It does that by using hormones to deliver messages to every single one of them.

This high-ranking organ  is made up of lobules

that each contains smaller cells called follicles,

which store the hormones  the thyroid sends out into your blood.

Two of the most important  hormones it produces

are thyroxine and triiodothyronine, or T3 and T4.

is to instruct every cell in the body when to consume oxygen and nutrients.

the series of reactions our cells perform to provide us with energy.

This hormonal notification  from the thyroid

and makes our cells  break down nutrients faster.

the thyroid helps by sending out  hormones to increase metabolism.

Ultimately, the thyroid allows our cells to use energy, grow and reproduce.

The thyroid is controlled by the pituitary gland,

a hormonal gland deep in the brain that oversees the thyroid's tasks,

making sure it knows  when to send out its messengers.

The pituitary's role is to sense  if hormone levels in the blood

in the form of the thyroid- stimulating hormone.

Even in this tightly  controlled system, however,

or chemical imbalances in the body can confuse the organ

and make it deaf  to the pituitary's guiding commands.

The first problem this causes  is hyperthyroidism,

which happens when the organ sends out too many hormones.

That means the cells  are overloaded with instructions

meaning a person with hyperthyroidism experiences a higher metabolism

signaled by a faster heartbeat, constant hunger, and rapid weight loss.

They also feel hot, sweaty, anxious, and find it difficult to sleep.

which happens when the thyroid  sends out too few hormones,

meaning the body's cells don't have as many messengers to guide them.

In response, cells grow listless and metabolism slows.

People with hypothyroidism see symptoms in weight gain,

sluggishness, sensitivity to cold,  swollen joints and feeling low.

that can help trigger  the thyroid's activities again,

and bring the body back  to a steady metabolic rate.

For such a little organ, the thyroid wields an awful lot of power.

But a healthy thyroid  manages our cells so effectively

that it can keep us running smoothly without us even noticing it's there.